Merge pull request #1951 from alexlamsl/harmony-v3.0.7

Merging from master for 3.0.7

.github/ISSUE_TEMPLATE.md

@@ -1,25 +1,20 @@
-**Bug report or feature request?**
+**Bug report or feature request?** 
 
 <!-- Note: sub-optimal but correct code is not a bug -->
 
+**ES5 or ES6+ input?** 
+
+<!-- Note: for ES6 see: https://github.com/mishoo/UglifyJS2/tree/harmony#harmony -->
+
 **Uglify version (`uglifyjs -V`)**
 
-**JavaScript input**
-
-<!--
-    A complete parsable JS program exhibiting the issue with
-    UglifyJS alone - without third party tools or libraries.
-    Ideally the input should be as small as possible.
-    Post a link to a gist if necessary.
-
-    Issues without a reproducible test case will be closed.
--->
+**JavaScript input**  <!-- ideally as small as possible -->
 
 **The `uglifyjs` CLI command executed or `minify()` options used.**
 
 **JavaScript output or error produced.**
 
 <!--
-    Note: `uglify-js` only supports JavaScript.
-    Those wishing to minify ES6+ should transpile first.
+    Note: `uglify-js` only supports ES5. 
+    Those wishing to minify ES6 should use `uglify-es`.
 -->

.github/workflows/ci.yml

@@ -1,43 +0,0 @@
-name: CI
-on: [ push, pull_request ]
-jobs:
-  test:
-    strategy:
-      matrix:
-        node: [ "0.8", "0.10", "0.12", "4", "6", "8", "10", "12", latest ]
-        os: [ ubuntu-latest, windows-latest ]
-        script: [ compress, mocha, release/benchmark, release/jetstream ]
-        exclude:
-          - node: "0.8"
-            script: release/jetstream
-    name: ${{ matrix.node }} ${{ matrix.os }} ${{ matrix.script }}
-    runs-on: ${{ matrix.os }}
-    env:
-      NODE: ${{ matrix.node }}
-      TYPE: ${{ matrix.script }}
-    steps:
-      - uses: actions/checkout@v1
-      - uses: actions/cache@v1
-        with:
-          path: tmp
-          key: tmp ${{ matrix.script }}
-      - name: Perform tests
-        shell: bash
-        run: |
-          git clone --branch v1.5.4 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
-          while ! timeout 60 bash -c '. ~/.nvs/nvs.sh add $NODE && nvs use $NODE'; do
-            cd ~/.nvs
-            git clean -xdf
-            cd -
-          done
-          . ~/.nvs/nvs.sh --version
-          nvs use $NODE
-          node --version
-          npm config set audit false
-          npm config set optional false
-          npm config set save false
-          npm config set strict-ssl false
-          npm config set update-notifier false
-          npm --version
-          while !(npm install); do echo "'npm install' failed - retrying..."; done
-          node test/$TYPE

.github/workflows/ufuzz.yml

@@ -1,34 +0,0 @@
-name: Fuzzing
-on:
-  schedule:
-    - cron: "*/15 * * * *"
-jobs:
-  ufuzz:
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ ubuntu-latest, windows-latest ]
-    name: ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    steps:
-      - uses: actions/checkout@v1
-      - name: Perform fuzzing
-        shell: bash
-        run: |
-          git clone --branch v1.5.4 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
-          while ! timeout 60 bash -c '. ~/.nvs/nvs.sh add 10 && nvs use 10'; do
-            cd ~/.nvs
-            git clean -xdf
-            cd -
-          done
-          . ~/.nvs/nvs.sh --version
-          nvs use 10
-          node --version
-          npm config set audit false
-          npm config set optional false
-          npm config set save false
-          npm config set strict-ssl false
-          npm config set update-notifier false
-          npm --version
-          while !(npm install); do echo "'npm install' failed - retrying..."; done
-          node test/ufuzz/job 3600000

.travis.yml

@@ -0,0 +1,11 @@
+language: node_js
+node_js:
+    - "0.10"
+    - "0.12"
+    - "4"
+    - "6"
+env:
+    - UGLIFYJS_TEST_ALL=1
+matrix:
+  fast_finish: true
+sudo: false

CONTRIBUTING.md

@@ -1,61 +0,0 @@
-Contributing
-============
-
-## Documentation
-
-Every new feature and API change should be accompanied by a README additon.
-
-## Testing
-
-All features and bugs should have tests that verify the fix. You can run all
-tests using `npm test`.
-
-The most common type of test are tests that verify input and output of the
-Uglify transforms. These tests exist in `test/compress`. New tests can be added
-either to an existing file or in a new file `issue-xxx.js`.
-
-Tests that cannot be expressed as a simple AST can be found in `test/mocha`.
-
-## Code style
-
-- File encoding must be `UTF-8`.
-- `LF` is always used as a line ending.
-- Statements end with semicolons.
-- Indentation uses 4 spaces, switch `case` 2 spaces.
-- Identifiers use `snake_case`.
-- Strings use double quotes (`"`).
-- Use a trailing comma for multiline array and object literals to minimize diffs.
-- The Uglify code only uses ES5, even in the `harmony` branch.
-- Line length should be at most 80 cols, except when it is easier to read a
-  longer line.
-- If both sides of a comparison are of the same type, `==` and `!=` are used.
-- Multiline conditions place `&&` and `||` first on the line.
-
-**Example feature**
-
-```js
-OPT(AST_Debugger, function(self, compressor) {
-    if (compressor.option("drop_debugger"))
-        return make_node(AST_EmptyStatement, self);
-    return self;
-});
-```
-
-**Example test case**
-
-```js
-drop_debugger: {
-    options = {
-        drop_debugger: true,
-    }
-    input: {
-        debugger;
-        if (foo) debugger;
-    }
-    expect: {
-        if (foo);
-    }
-}
-```
-
-

LICENSE

@@ -1,6 +1,6 @@
 UglifyJS is released under the BSD license:
 
-Copyright 2012-2019 (c) Mihai Bazon <mihai.bazon@gmail.com>
+Copyright 2012-2013 (c) Mihai Bazon <mihai.bazon@gmail.com>
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions

appveyor.yml

@@ -1,5 +1,24 @@
-build: off
+environment:
+  matrix:
+  - nodejs_version: "0.10"
+  - nodejs_version: "0.12"
+  - nodejs_version: "4.0"
+  - nodejs_version: "6.0"
+
 matrix:
   fast_finish: true
+
+platform:
+  - x86
+  - x64
+
+install:
+  - ps: Install-Product node $env:nodejs_version $env:platform
+  - npm install
+
 test_script:
-  - echo No longer in use
+  - node --version
+  - npm --version
+  - npm test
+
+build: off

bin/uglifyjs

@@ -3,7 +3,11 @@
 
 "use strict";
 
-require("../tools/exit");
+// workaround for tty output truncation upon process.exit()
+[process.stdout, process.stderr].forEach(function(stream){
+    if (stream._handle && stream._handle.setBlocking)
+        stream._handle.setBlocking(true);
+});
 
 var fs = require("fs");
 var info = require("../package.json");
@@ -11,65 +15,43 @@ var path = require("path");
 var program = require("commander");
 var UglifyJS = require("../tools/node");
 
-var skip_keys = [ "cname", "inlined", "parent_scope", "scope", "uses_eval", "uses_with" ];
+var skip_keys = [ "cname", "enclosed", "parent_scope", "scope", "thedef", "uses_eval", "uses_with" ];
 var files = {};
 var options = {
     compress: false,
     mangle: false
 };
-program.version(info.name + " " + info.version);
+program.version(info.name + ' ' + info.version);
 program.parseArgv = program.parse;
 program.parse = undefined;
-if (process.argv.indexOf("ast") >= 0) program.helpInformation = UglifyJS.describe_ast;
-else if (process.argv.indexOf("options") >= 0) program.helpInformation = function() {
-    var text = [];
-    var options = UglifyJS.default_options();
-    for (var option in options) {
-        text.push("--" + (option == "output" ? "beautify" : option == "sourceMap" ? "source-map" : option) + " options:");
-        text.push(format_object(options[option]));
-        text.push("");
-    }
-    return text.join("\n");
-};
-program.option("-p, --parse <options>", "Specify parser options.", parse_js());
-program.option("-c, --compress [options]", "Enable compressor/specify compressor options.", parse_js());
-program.option("-m, --mangle [options]", "Mangle names/specify mangler options.", parse_js());
-program.option("--mangle-props [options]", "Mangle properties/specify mangler options.", parse_js());
-program.option("-b, --beautify [options]", "Beautify output/specify output options.", parse_js());
-program.option("-O, --output-opts [options]", "Output options (beautify disabled).", parse_js());
+program.option("-p, --parse <options>", "Specify parser options.", parse_js("parse", true));
+program.option("-c, --compress [options]", "Enable compressor/specify compressor options.", parse_js("compress", true));
+program.option("-m, --mangle [options]", "Mangle names/specify mangler options.", parse_js("mangle", true));
+program.option("--mangle-props [options]", "Mangle properties/specify mangler options.", parse_js("mangle-props", true));
+program.option("-b, --beautify [options]", "Beautify output/specify output options.", parse_js("beautify", true));
 program.option("-o, --output <file>", "Output file (default STDOUT).");
 program.option("--comments [filter]", "Preserve copyright comments in the output.");
 program.option("--config-file <file>", "Read minify() options from JSON file.");
 program.option("-d, --define <expr>[=value]", "Global definitions.", parse_js("define"));
-program.option("-e, --enclose [arg[,...][:value[,...]]]", "Embed everything in a big function, with configurable argument(s) & value(s).");
 program.option("--ie8", "Support non-standard Internet Explorer 8.");
 program.option("--keep-fnames", "Do not mangle/drop function names. Useful for code relying on Function.prototype.name.");
 program.option("--name-cache <file>", "File to hold mangled name mappings.");
-program.option("--rename", "Force symbol expansion.");
-program.option("--no-rename", "Disable symbol expansion.");
 program.option("--self", "Build UglifyJS as a library (implies --wrap UglifyJS)");
-program.option("--source-map [options]", "Enable source map/specify source map options.", parse_js());
-program.option("--timings", "Display operations run time on STDERR.");
+program.option("--source-map [options]", "Enable source map/specify source map options.", parse_source_map());
+program.option("--stats", "Display operations run time on STDERR.")
 program.option("--toplevel", "Compress and/or mangle variables in toplevel scope.");
 program.option("--verbose", "Print diagnostic messages.");
 program.option("--warn", "Print warning messages.");
 program.option("--wrap <name>", "Embed everything as a function with “exports” corresponding to “name” globally.");
-program.option("--reduce-test", "Reduce a standalone `console.log` based test case.");
 program.arguments("[files...]").parseArgv(process.argv);
 if (program.configFile) {
     options = JSON.parse(read_file(program.configFile));
-    if (options.mangle && options.mangle.properties && options.mangle.properties.regex) {
-        options.mangle.properties.regex = UglifyJS.parse(options.mangle.properties.regex, {
-            expression: true
-        }).value;
-    }
 }
 if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
-    fatal("cannot write source map to STDOUT");
+    fatal("ERROR: cannot write source map to STDOUT");
 }
 [
     "compress",
-    "enclose",
     "ie8",
     "mangle",
     "sourceMap",
@@ -80,25 +62,12 @@ if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
         options[name] = program[name];
     }
 });
-if (program.verbose) {
-    options.warnings = "verbose";
-} else if (program.warn) {
-    options.warnings = true;
-}
-if (options.warnings) {
-    UglifyJS.AST_Node.log_function(print_error, options.warnings == "verbose");
-    delete options.warnings;
-}
 if (program.beautify) {
     options.output = typeof program.beautify == "object" ? program.beautify : {};
     if (!("beautify" in options.output)) {
         options.output.beautify = true;
     }
 }
-if (program.outputOpts) {
-    if (program.beautify) fatal("--beautify cannot be used with --output-opts");
-    options.output = typeof program.outputOpts == "object" ? program.outputOpts : {};
-}
 if (program.comments) {
     if (typeof options.output != "object") options.output = {};
     options.output.comments = typeof program.comments == "string" ? program.comments : "some";
@@ -120,14 +89,23 @@ if (program.mangleProps) {
         if (typeof program.mangleProps != "object") program.mangleProps = {};
         if (!Array.isArray(program.mangleProps.reserved)) program.mangleProps.reserved = [];
         require("../tools/domprops").forEach(function(name) {
-            UglifyJS.push_uniq(program.mangleProps.reserved, name);
+            UglifyJS._push_uniq(program.mangleProps.reserved, name);
         });
     }
     if (typeof options.mangle != "object") options.mangle = {};
     options.mangle.properties = program.mangleProps;
 }
+var cache;
 if (program.nameCache) {
-    options.nameCache = JSON.parse(read_file(program.nameCache, "{}"));
+    cache = JSON.parse(read_file(program.nameCache, "{}"));
+    if (options.mangle) {
+        if (typeof options.mangle != "object") options.mangle = {};
+        options.mangle.cache = to_cache("vars");
+        if (options.mangle.properties) {
+            if (typeof options.mangle.properties != "object") options.mangle.properties = {};
+            options.mangle.properties.cache = to_cache("props");
+        }
+    }
 }
 if (program.output == "ast") {
     options.output = {
@@ -136,17 +114,12 @@ if (program.output == "ast") {
     };
 }
 if (program.parse) {
-    if (!program.parse.acorn && !program.parse.spidermonkey) {
+    if (program.parse.acorn || program.parse.spidermonkey) {
+        if (program.sourceMap) fatal("ERROR: inline source map only works with built-in parser");
+    } else {
         options.parse = program.parse;
-    } else if (program.sourceMap && program.sourceMap.content == "inline") {
-        fatal("inline source map only works with built-in parser");
     }
 }
-if (~program.rawArgs.indexOf("--rename")) {
-    options.rename = true;
-} else if (!program.rename) {
-    options.rename = false;
-}
 var convert_path = function(name) {
     return name;
 };
@@ -159,8 +132,15 @@ if (typeof program.sourceMap == "object" && "base" in program.sourceMap) {
         };
     }();
 }
+if (program.verbose) {
+    options.warnings = "verbose";
+} else if (program.warn) {
+    options.warnings = true;
+}
 if (program.self) {
-    if (program.args.length) UglifyJS.AST_Node.warn("Ignoring input files since --self was passed");
+    if (program.args.length) {
+        console.error("WARN: Ignoring input files since --self was passed");
+    }
     if (!options.wrap) options.wrap = "UglifyJS";
     simple_glob(UglifyJS.FILES).forEach(function(name) {
         files[convert_path(name)] = read_file(name);
@@ -188,12 +168,10 @@ function convert_ast(fn) {
 }
 
 function run() {
-    var content = program.sourceMap && program.sourceMap.content;
-    if (content && content != "inline") {
-        UglifyJS.AST_Node.info("Using input source map: " + content);
-        options.sourceMap.content = read_file(content, content);
-    }
-    if (program.timings) options.timings = true;
+    UglifyJS.AST_Node.warn_function = function(msg) {
+        console.error("WARN:", msg);
+    };
+    if (program.stats) program.stats = Date.now();
     try {
         if (program.parse) {
             if (program.parse.acorn) {
@@ -216,58 +194,34 @@ function run() {
     } catch (ex) {
         fatal(ex);
     }
-    if (program.reduceTest) {
-        // load on demand - assumes dev tree checked out
-        var reduce_test = require("../test/reduce");
-        var testcase = files[0] || files[Object.keys(files)[0]];
-        var result = reduce_test(testcase, options, {verbose: true});
-    }
-    else {
-        var result = UglifyJS.minify(files, options);
-    }
+    var result = UglifyJS.minify(files, options);
     if (result.error) {
         var ex = result.error;
         if (ex.name == "SyntaxError") {
-            print_error("Parse error at " + ex.filename + ":" + ex.line + "," + ex.col);
-            var file = files[ex.filename];
-            if (file) {
-                var col = ex.col;
-                var lines = file.split(/\r?\n/);
-                var line = lines[ex.line - 1];
-                if (!line && !col) {
-                    line = lines[ex.line - 2];
-                    col = line.length;
-                }
-                if (line) {
-                    var limit = 70;
-                    if (col > limit) {
-                        line = line.slice(col - limit);
-                        col = limit;
-                    }
-                    print_error(line.slice(0, 80));
-                    print_error(line.slice(0, col).replace(/\S/g, " ") + "^");
-                }
+            console.error("Parse error at " + ex.filename + ":" + ex.line + "," + ex.col);
+            var col = ex.col;
+            var lines = files[ex.filename].split(/\r?\n/);
+            var line = lines[ex.line - 1];
+            if (!line && !col) {
+                line = lines[ex.line - 2];
+                col = line.length;
             }
-        } else if (ex.defs) {
-            print_error("Supported options:");
-            print_error(format_object(ex.defs));
+            if (line) {
+                if (col > 40) {
+                    line = line.slice(col - 40);
+                    col = 40;
+                }
+                console.error(line.slice(0, 80));
+                console.error(line.slice(0, col).replace(/\S/g, " ") + "^");
+            }
+        }
+        if (ex.defs) {
+            console.error("Supported options:");
+            console.error(ex.defs);
         }
         fatal(ex);
     } else if (program.output == "ast") {
-        if (!options.compress && !options.mangle) {
-            result.ast.figure_out_scope({});
-        }
-        print(JSON.stringify(result.ast, function(key, value) {
-            if (value) switch (key) {
-              case "thedef":
-                return symdef(value);
-              case "enclosed":
-                return value.length ? value.map(symdef) : undefined;
-              case "variables":
-              case "functions":
-              case "globals":
-                return value.size() ? value.map(symdef) : undefined;
-            }
+        console.log(JSON.stringify(result.ast, function(key, value) {
             if (skip_key(key)) return;
             if (value instanceof UglifyJS.AST_Token) return;
             if (value instanceof UglifyJS.Dictionary) return;
@@ -283,7 +237,7 @@ function run() {
             return value;
         }, 2));
     } else if (program.output == "spidermonkey") {
-        print(JSON.stringify(UglifyJS.minify(result.code, {
+        console.log(JSON.stringify(UglifyJS.minify(result.code, {
             compress: false,
             mangle: false,
             output: {
@@ -297,23 +251,19 @@ function run() {
             fs.writeFileSync(program.output + ".map", result.map);
         }
     } else {
-        print(result.code);
+        console.log(result.code);
     }
     if (program.nameCache) {
-        fs.writeFileSync(program.nameCache, JSON.stringify(options.nameCache));
-    }
-    if (result.timings) for (var phase in result.timings) {
-        print_error("- " + phase + ": " + result.timings[phase].toFixed(3) + "s");
+        fs.writeFileSync(program.nameCache, JSON.stringify(cache, function(key, value) {
+            return value instanceof UglifyJS.Dictionary ? value.toObject() : value;
+        }));
     }
+    if (program.stats) console.error("Elapsed:", Date.now() - program.stats);
 }
 
 function fatal(message) {
-    if (message instanceof Error) {
-        message = message.stack.replace(/^\S*?Error:/, "ERROR:")
-    } else {
-        message = "ERROR: " + message;
-    }
-    print_error(message);
+    if (message instanceof Error) message = message.stack.replace(/^\S*?Error:/, "ERROR:")
+    console.error(message);
     process.exit(1);
 }
 
@@ -337,7 +287,7 @@ function simple_glob(glob) {
                 .replace(/\?/g, "[^/\\\\]") + "$";
             var mod = process.platform === "win32" ? "i" : "";
             var rx = new RegExp(pattern, mod);
-            var results = entries.sort().filter(function(name) {
+            var results = entries.filter(function(name) {
                 return rx.test(name);
             }).map(function(name) {
                 return path.join(dir, name);
@@ -357,17 +307,25 @@ function read_file(path, default_value) {
     }
 }
 
-function parse_js(flag) {
+function parse_js(flag, constants) {
     return function(value, options) {
         options = options || {};
         try {
-            UglifyJS.parse(value, {
-                expression: true
-            }).walk(new UglifyJS.TreeWalker(function(node) {
+            UglifyJS.minify(value, {
+                parse: {
+                    expression: true
+                },
+                compress: false,
+                mangle: false,
+                output: {
+                    ast: true,
+                    code: false
+                }
+            }).ast.walk(new UglifyJS.TreeWalker(function(node) {
                 if (node instanceof UglifyJS.AST_Assign) {
                     var name = node.left.print_to_string();
                     var value = node.right;
-                    if (flag) {
+                    if (!constants) {
                         options[name] = value;
                     } else if (value instanceof UglifyJS.AST_Array) {
                         options[name] = value.elements.map(to_string);
@@ -384,50 +342,43 @@ function parse_js(flag) {
                 if (!(node instanceof UglifyJS.AST_Sequence)) throw node;
 
                 function to_string(value) {
-                    return value instanceof UglifyJS.AST_Constant ? value.value : value.print_to_string({
+                    return value instanceof UglifyJS.AST_Constant ? value.getValue() : value.print_to_string({
                         quote_keys: true
                     });
                 }
             }));
-        } catch (ex) {
-            if (flag) {
-                fatal("cannot parse arguments for '" + flag + "': " + value);
-            } else {
-                options[value] = null;
-            }
+        } catch(ex) {
+            fatal("Error parsing arguments for '" + flag + "': " + value);
         }
         return options;
     }
 }
 
+function parse_source_map() {
+    var parse = parse_js("sourceMap", true);
+    return function(value, options) {
+        var hasContent = options && options.sourceMap && "content" in options.sourceMap;
+        var settings = parse(value, options);
+        if (!hasContent && settings.content && settings.content != "inline") {
+            console.error("INFO: Using input source map:", settings.content);
+            settings.content = read_file(settings.content, settings.content);
+        }
+        return settings;
+    }
+}
+
+function to_cache(key) {
+    if (cache[key]) {
+        cache[key].props = UglifyJS.Dictionary.fromObject(cache[key].props);
+    } else {
+        cache[key] = {
+            cname: -1,
+            props: new UglifyJS.Dictionary()
+        };
+    }
+    return cache[key];
+}
+
 function skip_key(key) {
     return skip_keys.indexOf(key) >= 0;
 }
-
-function symdef(def) {
-    var ret = (1e6 + def.id) + " " + def.name;
-    if (def.mangled_name) ret += " " + def.mangled_name;
-    return ret;
-}
-
-function format_object(obj) {
-    var lines = [];
-    var padding = "";
-    Object.keys(obj).map(function(name) {
-        if (padding.length < name.length) padding = Array(name.length + 1).join(" ");
-        return [ name, JSON.stringify(obj[name]) ];
-    }).forEach(function(tokens) {
-        lines.push("  " + tokens[0] + padding.slice(tokens[0].length - 2) + tokens[1]);
-    });
-    return lines.join("\n");
-}
-
-function print_error(msg) {
-    process.stderr.write(msg);
-    process.stderr.write("\n");
-}
-
-function print(txt) {
-    process.stdout.write(txt);
-    process.stdout.write("\n");
-}

lib/minify.js

@@ -1,47 +1,19 @@
 "use strict";
 
-var to_ascii, to_base64;
-if (typeof Buffer == "undefined") {
-    to_ascii = atob;
-    to_base64 = btoa;
-} else if (typeof Buffer.alloc == "undefined") {
-    to_ascii = function(b64) {
-        return new Buffer(b64, "base64").toString();
-    };
-    to_base64 = function(str) {
-        return new Buffer(str).toString("base64");
-    };
-} else {
-    to_ascii = function(b64) {
-        return Buffer.from(b64, "base64").toString();
-    };
-    to_base64 = function(str) {
-        return Buffer.from(str).toString("base64");
-    };
-}
+var to_ascii = typeof atob == "undefined" ? function(b64) {
+    return new Buffer(b64, "base64").toString();
+} : atob;
+var to_base64 = typeof btoa == "undefined" ? function(str) {
+    return new Buffer(str).toString("base64");
+} : btoa;
 
-function read_source_map(name, toplevel) {
-    var comments = toplevel.end.comments_after;
-    for (var i = comments.length; --i >= 0;) {
-        var comment = comments[i];
-        if (comment.type != "comment1") break;
-        var match = /^# ([^\s=]+)=(\S+)\s*$/.exec(comment.value);
-        if (!match) break;
-        if (match[1] == "sourceMappingURL") {
-            match = /^data:application\/json(;.*?)?;base64,(\S+)$/.exec(match[2]);
-            if (!match) break;
-            return to_ascii(match[2]);
-        }
-    }
-    AST_Node.warn("inline source map not found: " + name);
-}
-
-function parse_source_map(content) {
-    try {
-        return JSON.parse(content);
-    } catch (ex) {
-        throw new Error("invalid input source map: " + content);
+function read_source_map(code) {
+    var match = /\n\/\/# sourceMappingURL=data:application\/json(;.*?)?;base64,(.*)/.exec(code);
+    if (!match) {
+        AST_Node.warn("inline source map not found");
+        return null;
     }
+    return to_ascii(match[2]);
 }
 
 function set_shorthand(name, options, keys) {
@@ -55,74 +27,40 @@ function set_shorthand(name, options, keys) {
     }
 }
 
-function init_cache(cache) {
-    if (!cache) return;
-    if (!("props" in cache)) {
-        cache.props = new Dictionary();
-    } else if (!(cache.props instanceof Dictionary)) {
-        cache.props = Dictionary.fromObject(cache.props);
-    }
-}
-
-function to_json(cache) {
-    return {
-        props: cache.props.toObject()
-    };
-}
-
 function minify(files, options) {
+    var warn_function = AST_Node.warn_function;
     try {
+        if (typeof files == "string") {
+            files = [ files ];
+        }
         options = defaults(options, {
             compress: {},
-            enclose: false,
             ie8: false,
             keep_fnames: false,
             mangle: {},
-            nameCache: null,
             output: {},
             parse: {},
-            rename: undefined,
             sourceMap: false,
-            timings: false,
             toplevel: false,
             warnings: false,
             wrap: false,
         }, true);
-        var timings = options.timings && {
-            start: Date.now()
-        };
-        if (options.rename === undefined) {
-            options.rename = options.compress && options.mangle;
-        }
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
-        var quoted_props;
+        set_shorthand("warnings", options, [ "compress" ]);
         if (options.mangle) {
             options.mangle = defaults(options.mangle, {
-                cache: options.nameCache && (options.nameCache.vars || {}),
+                cache: null,
                 eval: false,
                 ie8: false,
+                keep_classnames: false,
                 keep_fnames: false,
                 properties: false,
                 reserved: [],
+                safari10: false,
                 toplevel: false,
             }, true);
-            if (options.mangle.properties) {
-                if (typeof options.mangle.properties != "object") {
-                    options.mangle.properties = {};
-                }
-                if (options.mangle.properties.keep_quoted) {
-                    quoted_props = options.mangle.properties.reserved;
-                    if (!Array.isArray(quoted_props)) quoted_props = [];
-                    options.mangle.properties.reserved = quoted_props;
-                }
-                if (options.nameCache && !("cache" in options.mangle.properties)) {
-                    options.mangle.properties.cache = options.nameCache.props || {};
-                }
-            }
-            init_cache(options.mangle.cache);
-            init_cache(options.mangle.properties.cache);
         }
         if (options.sourceMap) {
             options.sourceMap = defaults(options.sourceMap, {
@@ -134,85 +72,61 @@ function minify(files, options) {
             }, true);
         }
         var warnings = [];
-        if (options.warnings) AST_Node.log_function(function(warning) {
-            warnings.push(warning);
-        }, options.warnings == "verbose");
-        if (timings) timings.parse = Date.now();
-        var source_maps, toplevel;
+        if (options.warnings && !AST_Node.warn_function) {
+            AST_Node.warn_function = function(warning) {
+                warnings.push(warning);
+            };
+        }
+        var toplevel;
         if (files instanceof AST_Toplevel) {
             toplevel = files;
         } else {
-            if (typeof files == "string") {
-                files = [ files ];
-            }
             options.parse = options.parse || {};
             options.parse.toplevel = null;
-            var source_map_content = options.sourceMap && options.sourceMap.content;
-            if (typeof source_map_content == "string" && source_map_content != "inline") {
-                source_map_content = parse_source_map(source_map_content);
-            }
-            source_maps = source_map_content && Object.create(null);
-            for (var name in files) if (HOP(files, name)) {
+            for (var name in files) {
                 options.parse.filename = name;
-                options.parse.toplevel = toplevel = parse(files[name], options.parse);
-                if (source_maps) {
-                    if (source_map_content == "inline") {
-                        var inlined_content = read_source_map(name, toplevel);
-                        if (inlined_content) {
-                            source_maps[name] = parse_source_map(inlined_content);
-                        }
-                    } else {
-                        source_maps[name] = source_map_content;
-                    }
+                options.parse.toplevel = parse(files[name], options.parse);
+                if (options.sourceMap && options.sourceMap.content == "inline") {
+                    if (Object.keys(files).length > 1)
+                        throw new Error("inline source map only works with singular input");
+                    options.sourceMap.content = read_source_map(files[name]);
                 }
             }
+            toplevel = options.parse.toplevel;
         }
-        if (quoted_props) {
-            reserve_quoted_keys(toplevel, quoted_props);
+        if (options.wrap) {
+            toplevel = toplevel.wrap_commonjs(options.wrap);
         }
-        [ "enclose", "wrap" ].forEach(function(action) {
-            var option = options[action];
-            if (!option) return;
-            var orig = toplevel.print_to_string().slice(0, -1);
-            toplevel = toplevel[action](option);
-            files[toplevel.start.file] = toplevel.print_to_string().replace(orig, "");
-        });
-        if (timings) timings.rename = Date.now();
-        if (options.rename) {
+        if (options.compress) {
             toplevel.figure_out_scope(options.mangle);
-            toplevel.expand_names(options.mangle);
+            toplevel = new Compressor(options.compress).compress(toplevel);
         }
-        if (timings) timings.compress = Date.now();
-        if (options.compress) toplevel = new Compressor(options.compress).compress(toplevel);
-        if (timings) timings.scope = Date.now();
-        if (options.mangle) toplevel.figure_out_scope(options.mangle);
-        if (timings) timings.mangle = Date.now();
         if (options.mangle) {
+            toplevel.figure_out_scope(options.mangle);
+            base54.reset();
             toplevel.compute_char_frequency(options.mangle);
             toplevel.mangle_names(options.mangle);
+            if (options.mangle.properties) {
+                toplevel = mangle_properties(toplevel, options.mangle.properties);
+            }
         }
-        if (timings) timings.properties = Date.now();
-        if (options.mangle && options.mangle.properties) {
-            toplevel = mangle_properties(toplevel, options.mangle.properties);
-        }
-        if (timings) timings.output = Date.now();
         var result = {};
         if (options.output.ast) {
             result.ast = toplevel;
         }
         if (!HOP(options.output, "code") || options.output.code) {
             if (options.sourceMap) {
+                if (typeof options.sourceMap.content == "string") {
+                    options.sourceMap.content = JSON.parse(options.sourceMap.content);
+                }
                 options.output.source_map = SourceMap({
-                    content: options.sourceMap.includeSources,
                     file: options.sourceMap.filename,
-                    orig: source_maps,
+                    orig: options.sourceMap.content,
                     root: options.sourceMap.root
                 });
                 if (options.sourceMap.includeSources) {
-                    if (files instanceof AST_Toplevel) {
-                        throw new Error("original source content unavailable");
-                    } else for (var name in files) if (HOP(files, name)) {
-                        options.output.source_map.setSourceContent(name, files[name]);
+                    for (var name in files) {
+                        options.output.source_map.get().setSourceContent(name, files[name]);
                     }
                 }
             }
@@ -223,41 +137,20 @@ function minify(files, options) {
             result.code = stream.get();
             if (options.sourceMap) {
                 result.map = options.output.source_map.toString();
-                var url = options.sourceMap.url;
-                if (url) {
-                    result.code = result.code.replace(/\n\/\/# sourceMappingURL=\S+\s*$/, "");
-                    if (url == "inline") {
-                        result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(result.map);
-                    } else {
-                        result.code += "\n//# sourceMappingURL=" + url;
-                    }
+                if (options.sourceMap.url == "inline") {
+                    result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(result.map);
+                } else if (options.sourceMap.url) {
+                    result.code += "\n//# sourceMappingURL=" + options.sourceMap.url;
                 }
             }
         }
-        if (options.nameCache && options.mangle) {
-            if (options.mangle.cache) options.nameCache.vars = to_json(options.mangle.cache);
-            if (options.mangle.properties && options.mangle.properties.cache) {
-                options.nameCache.props = to_json(options.mangle.properties.cache);
-            }
-        }
-        if (timings) {
-            timings.end = Date.now();
-            result.timings = {
-                parse: 1e-3 * (timings.rename - timings.parse),
-                rename: 1e-3 * (timings.compress - timings.rename),
-                compress: 1e-3 * (timings.scope - timings.compress),
-                scope: 1e-3 * (timings.mangle - timings.scope),
-                mangle: 1e-3 * (timings.properties - timings.mangle),
-                properties: 1e-3 * (timings.output - timings.properties),
-                output: 1e-3 * (timings.end - timings.output),
-                total: 1e-3 * (timings.end - timings.start)
-            };
-        }
         if (warnings.length) {
             result.warnings = warnings;
         }
         return result;
     } catch (ex) {
         return { error: ex };
+    } finally {
+        AST_Node.warn_function = warn_function;
     }
 }

lib/mozilla-ast.js

@@ -43,9 +43,11 @@
 
 "use strict";
 
-(function() {
-    function normalize_directives(body) {
+(function(){
+
+    var normalize_directives = function(body) {
         var in_directive = true;
+
         for (var i = 0; i < body.length; i++) {
             if (in_directive && body[i] instanceof AST_Statement && body[i].body instanceof AST_String) {
                 body[i] = new AST_Directive({
@@ -57,8 +59,9 @@
                 in_directive = false;
             }
         }
+
         return body;
-    }
+    };
 
     var MOZ_TO_ME = {
         Program: function(M) {
@@ -115,7 +118,7 @@
                 value    : from_moz(M.value)
             };
             if (M.kind == "init") return new AST_ObjectKeyVal(args);
-            args.key = new AST_SymbolAccessor({
+            args.key = new AST_SymbolMethod({
                 name: args.key
             });
             args.value = new AST_Accessor(args.value);
@@ -126,7 +129,7 @@
             return new AST_Array({
                 start    : my_start_token(M),
                 end      : my_end_token(M),
-                elements : M.elements.map(function(elem) {
+                elements : M.elements.map(function(elem){
                     return elem === null ? new AST_Hole() : from_moz(elem);
                 })
             });
@@ -135,7 +138,7 @@
             return new AST_Object({
                 start      : my_start_token(M),
                 end        : my_end_token(M),
-                properties : M.properties.map(function(prop) {
+                properties : M.properties.map(function(prop){
                     prop.type = "Property";
                     return from_moz(prop)
                 })
@@ -165,7 +168,7 @@
             });
         },
         VariableDeclaration: function(M) {
-            return new AST_Var({
+            return new (M.kind === "const" ? AST_Const : AST_Var)({
                 start       : my_start_token(M),
                 end         : my_end_token(M),
                 definitions : M.declarations.map(from_moz)
@@ -177,17 +180,6 @@
                 end    : my_end_token(M)
             };
             if (val === null) return new AST_Null(args);
-            var rx = M.regex;
-            if (rx && rx.pattern) {
-                // RegExpLiteral as per ESTree AST spec
-                args.value = new RegExp(rx.pattern, rx.flags);
-                args.value.raw_source = rx.pattern;
-                return new AST_RegExp(args);
-            } else if (rx) {
-                // support legacy RegExp
-                args.value = M.regex && M.raw ? M.raw : val;
-                return new AST_RegExp(args);
-            }
             switch (typeof val) {
               case "string":
                 args.value = val;
@@ -197,12 +189,22 @@
                 return new AST_Number(args);
               case "boolean":
                 return new (val ? AST_True : AST_False)(args);
+              default:
+                var rx = M.regex;
+                if (rx && rx.pattern) {
+                    // RegExpLiteral as per ESTree AST spec
+                    args.value = new RegExp(rx.pattern, rx.flags).toString();
+                } else {
+                    // support legacy RegExp
+                    args.value = M.regex && M.raw ? M.raw : val;
+                }
+                return new AST_RegExp(args);
             }
         },
         Identifier: function(M) {
             var p = FROM_MOZ_STACK[FROM_MOZ_STACK.length - 2];
             return new (  p.type == "LabeledStatement" ? AST_Label
-                        : p.type == "VariableDeclarator" && p.id === M ? AST_SymbolVar
+                        : p.type == "VariableDeclarator" && p.id === M ? (p.kind == "const" ? AST_SymbolConst : AST_SymbolVar)
                         : p.type == "FunctionExpression" ? (p.id === M ? AST_SymbolLambda : AST_SymbolFunarg)
                         : p.type == "FunctionDeclaration" ? (p.id === M ? AST_SymbolDefun : AST_SymbolFunarg)
                         : p.type == "CatchClause" ? AST_SymbolCatch
@@ -322,7 +324,7 @@
     def_to_moz(AST_Definitions, function To_Moz_VariableDeclaration(M) {
         return {
             type: "VariableDeclaration",
-            kind: "var",
+            kind: M instanceof AST_Const ? "const" : "var",
             declarations: M.definitions.map(to_moz)
         };
     });
@@ -379,7 +381,7 @@
     def_to_moz(AST_ObjectProperty, function To_Moz_Property(M) {
         var key = {
             type: "Literal",
-            value: M.key instanceof AST_SymbolAccessor ? M.key.name : M.key
+            value: M.key instanceof AST_SymbolMethod ? M.key.name : M.key
         };
         var kind;
         if (M instanceof AST_ObjectKeyVal) {
@@ -403,20 +405,19 @@
         var def = M.definition();
         return {
             type: "Identifier",
-            name: def && def.mangled_name || M.name
+            name: def ? def.mangled_name || def.name : M.name
         };
     });
 
     def_to_moz(AST_RegExp, function To_Moz_RegExpLiteral(M) {
-        var flags = M.value.toString().match(/[gimuy]*$/)[0];
-        var value = "/" + M.value.raw_source + "/" + flags;
+        var value = M.value;
         return {
             type: "Literal",
             value: value,
-            raw: value,
+            raw: value.toString(),
             regex: {
-                pattern: M.value.raw_source,
-                flags: flags
+                pattern: value.source,
+                flags: value.toString().match(/[gimuy]*$/)[0]
             }
         };
     });
@@ -477,7 +478,7 @@
             endpos  : range ? range[0] : moznode.start,
             raw     : raw_token(moznode),
         });
-    }
+    };
 
     function my_end_token(moznode) {
         var loc = moznode.loc, end = loc && loc.end;
@@ -492,7 +493,7 @@
             endpos  : range ? range[1] : moznode.end,
             raw     : raw_token(moznode),
         });
-    }
+    };
 
     function map(moztype, mytype, propmap) {
         var moz_to_me = "function From_Moz_" + moztype + "(M){\n";
@@ -504,7 +505,7 @@
         me_to_moz += "return {\n" +
             "type: " + JSON.stringify(moztype);
 
-        if (propmap) propmap.split(/\s*,\s*/).forEach(function(prop) {
+        if (propmap) propmap.split(/\s*,\s*/).forEach(function(prop){
             var m = /([a-z0-9$_]+)(=|@|>|%)([a-z0-9$_]+)/i.exec(prop);
             if (!m) throw new Error("Can't understand property map: " + prop);
             var moz = m[1], how = m[2], my = m[3];
@@ -547,7 +548,7 @@
         );
         MOZ_TO_ME[moztype] = moz_to_me;
         def_to_moz(mytype, me_to_moz);
-    }
+    };
 
     var FROM_MOZ_STACK = null;
 
@@ -556,28 +557,13 @@
         var ret = node != null ? MOZ_TO_ME[node.type](node) : null;
         FROM_MOZ_STACK.pop();
         return ret;
-    }
+    };
 
-    AST_Node.from_mozilla_ast = function(node) {
+    AST_Node.from_mozilla_ast = function(node){
         var save_stack = FROM_MOZ_STACK;
         FROM_MOZ_STACK = [];
         var ast = from_moz(node);
         FROM_MOZ_STACK = save_stack;
-        ast.walk(new TreeWalker(function(node) {
-            if (node instanceof AST_LabelRef) {
-                for (var level = 0, parent; parent = this.parent(level); level++) {
-                    if (parent instanceof AST_Scope) break;
-                    if (parent instanceof AST_LabeledStatement && parent.label.name == node.name) {
-                        node.thedef = parent.label;
-                        break;
-                    }
-                }
-                if (!node.thedef) {
-                    var s = node.start;
-                    js_error("Undefined label " + node.name, s.file, s.line, s.col, s.pos);
-                }
-            }
-        }));
         return ast;
     };
 
@@ -597,24 +583,24 @@
             }
         }
         return moznode;
-    }
+    };
 
     function def_to_moz(mytype, handler) {
         mytype.DEFMETHOD("to_mozilla_ast", function() {
             return set_moz_loc(this, handler(this));
         });
-    }
+    };
 
     function to_moz(node) {
         return node != null ? node.to_mozilla_ast() : null;
-    }
+    };
 
     function to_moz_block(node) {
         return {
             type: "BlockStatement",
             body: node.body.map(to_moz)
         };
-    }
+    };
 
     function to_moz_scope(type, node) {
         var body = node.body.map(to_moz);
@@ -625,5 +611,5 @@
             type: type,
             body: body
         };
-    }
+    };
 })();

lib/propmangle.js

@@ -44,6 +44,16 @@
 "use strict";
 
 function find_builtins(reserved) {
+
+    // Compatibility fix for some standard defined globals not defined on every js environment
+    var new_globals = ["Symbol", "Map", "Promise", "Proxy", "Reflect", "Set", "WeakMap", "WeakSet"];
+    var objects = {};
+    var global_ref = typeof global === "object" ? global : self;
+
+    new_globals.forEach(function (new_global) {
+        objects[new_global] = global_ref[new_global] || new Function();
+    });
+
     // NaN will be included due to Number.NaN
     [
         "null",
@@ -53,57 +63,28 @@ function find_builtins(reserved) {
         "-Infinity",
         "undefined",
     ].forEach(add);
-    [
-        Array,
-        Boolean,
-        Date,
-        Error,
-        Function,
-        Math,
-        Number,
-        Object,
-        RegExp,
-        String,
-    ].forEach(function(ctor) {
+    [ Object, Array, Function, Number,
+      String, Boolean, Error, Math,
+      Date, RegExp, objects.Symbol, ArrayBuffer,
+      DataView, decodeURI, decodeURIComponent,
+      encodeURI, encodeURIComponent, eval, EvalError,
+      Float32Array, Float64Array, Int8Array, Int16Array,
+      Int32Array, isFinite, isNaN, JSON, objects.Map, parseFloat,
+      parseInt, objects.Promise, objects.Proxy, RangeError, ReferenceError,
+      objects.Reflect, objects.Set, SyntaxError, TypeError, Uint8Array,
+      Uint8ClampedArray, Uint16Array, Uint32Array, URIError,
+      objects.WeakMap, objects.WeakSet
+    ].forEach(function(ctor){
         Object.getOwnPropertyNames(ctor).map(add);
         if (ctor.prototype) {
             Object.getOwnPropertyNames(ctor.prototype).map(add);
         }
     });
-
     function add(name) {
         push_uniq(reserved, name);
     }
 }
 
-function reserve_quoted_keys(ast, reserved) {
-    ast.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_ObjectKeyVal && node.quote) {
-            add(node.key);
-        } else if (node instanceof AST_Sub) {
-            addStrings(node.property, add);
-        }
-    }));
-
-    function add(name) {
-        push_uniq(reserved, name);
-    }
-}
-
-function addStrings(node, add) {
-    node.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_Sequence) {
-            addStrings(node.tail_node(), add);
-        } else if (node instanceof AST_String) {
-            add(node.value);
-        } else if (node instanceof AST_Conditional) {
-            addStrings(node.consequent, add);
-            addStrings(node.alternative, add);
-        }
-        return true;
-    }));
-}
-
 function mangle_properties(ast, options) {
     options = defaults(options, {
         builtins: false,
@@ -113,67 +94,89 @@ function mangle_properties(ast, options) {
         only_cache: false,
         regex: null,
         reserved: null,
-    }, true);
+    });
 
-    var reserved = options.reserved;
-    if (!Array.isArray(reserved)) reserved = [];
+    var reserved = options.reserved || [];
     if (!options.builtins) find_builtins(reserved);
 
-    var cname = -1;
-    var cache;
-    if (options.cache) {
-        cache = options.cache.props;
-        cache.each(function(mangled_name) {
-            push_uniq(reserved, mangled_name);
-        });
-    } else {
-        cache = new Dictionary();
+    var cache = options.cache;
+    if (cache == null) {
+        cache = {
+            cname: -1,
+            props: new Dictionary()
+        };
     }
 
     var regex = options.regex;
+    var keep_quoted = options.keep_quoted;
 
     // note debug is either false (disabled), or a string of the debug suffix to use (enabled).
     // note debug may be enabled as an empty string, which is falsey. Also treat passing 'true'
     // the same as passing an empty string.
     var debug = options.debug !== false;
-    var debug_suffix;
-    if (debug) debug_suffix = options.debug === true ? "" : options.debug;
+    var debug_name_suffix;
+    if (debug) {
+        debug_name_suffix = (options.debug === true ? "" : options.debug);
+    }
 
     var names_to_mangle = [];
     var unmangleable = [];
+    var to_keep = {};
 
     // step 1: find candidates to mangle
-    ast.walk(new TreeWalker(function(node) {
+    ast.walk(new TreeWalker(function(node){
         if (node instanceof AST_ObjectKeyVal) {
-            add(node.key);
-        } else if (node instanceof AST_ObjectProperty) {
+            add(node.key, keep_quoted && node.quote);
+        }
+        else if (node instanceof AST_ObjectProperty) {
             // setter or getter, since KeyVal is handled above
             add(node.key.name);
-        } else if (node instanceof AST_Dot) {
+        }
+        else if (node instanceof AST_Dot) {
             add(node.property);
-        } else if (node instanceof AST_Sub) {
-            addStrings(node.property, add);
-        } else if (node instanceof AST_Call
-            && node.expression.print_to_string() == "Object.defineProperty") {
-            addStrings(node.args[1], add);
+        }
+        else if (node instanceof AST_Sub) {
+            addStrings(node.property, keep_quoted);
+        }
+        else if (node instanceof AST_ConciseMethod) {
+            add(node.name.name);
         }
     }));
 
     // step 2: transform the tree, renaming properties
-    return ast.transform(new TreeTransformer(function(node) {
+    return ast.transform(new TreeTransformer(function(node){
         if (node instanceof AST_ObjectKeyVal) {
-            node.key = mangle(node.key);
-        } else if (node instanceof AST_ObjectProperty) {
+            if (!(keep_quoted && node.quote))
+                node.key = mangle(node.key);
+        }
+        else if (node instanceof AST_ObjectProperty) {
             // setter or getter
             node.key.name = mangle(node.key.name);
-        } else if (node instanceof AST_Dot) {
-            node.property = mangle(node.property);
-        } else if (!options.keep_quoted && node instanceof AST_Sub) {
-            node.property = mangleStrings(node.property);
-        } else if (node instanceof AST_Call
-            && node.expression.print_to_string() == "Object.defineProperty") {
-            node.args[1] = mangleStrings(node.args[1]);
         }
+        else if (node instanceof AST_Dot) {
+            node.property = mangle(node.property);
+        }
+        else if (node instanceof AST_Sub) {
+            if (!keep_quoted)
+                node.property = mangleStrings(node.property);
+        }
+        else if (node instanceof AST_ConciseMethod) {
+            if (should_mangle(node.name.name)) {
+                node.name.name = mangle(node.name.name);
+            }
+        }
+        // else if (node instanceof AST_String) {
+        //     if (should_mangle(node.value)) {
+        //         AST_Node.warn(
+        //             "Found \"{prop}\" property candidate for mangling in an arbitrary string [{file}:{line},{col}]", {
+        //                 file : node.start.file,
+        //                 line : node.start.line,
+        //                 col  : node.start.col,
+        //                 prop : node.value
+        //             }
+        //         );
+        //     }
+        // }
     }));
 
     // only function declarations after this line
@@ -181,50 +184,102 @@ function mangle_properties(ast, options) {
     function can_mangle(name) {
         if (unmangleable.indexOf(name) >= 0) return false;
         if (reserved.indexOf(name) >= 0) return false;
-        if (options.only_cache) return cache.has(name);
+        if (options.only_cache) {
+            return cache.props.has(name);
+        }
         if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
         return true;
     }
 
     function should_mangle(name) {
+        if (keep_quoted && name in to_keep) return false;
         if (regex && !regex.test(name)) return false;
         if (reserved.indexOf(name) >= 0) return false;
-        return cache.has(name) || names_to_mangle.indexOf(name) >= 0;
+        return cache.props.has(name)
+            || names_to_mangle.indexOf(name) >= 0;
     }
 
-    function add(name) {
-        if (can_mangle(name)) push_uniq(names_to_mangle, name);
-        if (!should_mangle(name)) push_uniq(unmangleable, name);
+    function add(name, keep) {
+        if (keep) {
+            to_keep[name] = true;
+            return;
+        }
+
+        if (can_mangle(name))
+            push_uniq(names_to_mangle, name);
+
+        if (!should_mangle(name)) {
+            push_uniq(unmangleable, name);
+        }
     }
 
     function mangle(name) {
         if (!should_mangle(name)) {
             return name;
         }
-        var mangled = cache.get(name);
+
+        var mangled = cache.props.get(name);
         if (!mangled) {
             if (debug) {
                 // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
-                var debug_mangled = "_$" + name + "$" + debug_suffix + "_";
-                if (can_mangle(debug_mangled)) mangled = debug_mangled;
+                var debug_mangled = "_$" + name + "$" + debug_name_suffix + "_";
+
+                if (can_mangle(debug_mangled) && !(keep_quoted && debug_mangled in to_keep)) {
+                    mangled = debug_mangled;
+                }
             }
+
             // either debug mode is off, or it is on and we could not use the mangled name
-            if (!mangled) do {
-                mangled = base54(++cname);
-            } while (!can_mangle(mangled));
-            cache.set(name, mangled);
+            if (!mangled) {
+                // Note: `can_mangle()` does not check if the name collides with the `to_keep` set
+                // (filled with quoted properties when `keep_quoted` is set). Make sure we add this
+                // check so we don't collide with a quoted name.
+                do {
+                    mangled = base54(++cache.cname);
+                } while (!can_mangle(mangled) || keep_quoted && mangled in to_keep);
+            }
+
+            cache.props.set(name, mangled);
         }
         return mangled;
     }
 
+    function addStrings(node, keep) {
+        var out = {};
+        try {
+            (function walk(node){
+                node.walk(new TreeWalker(function(node){
+                    if (node instanceof AST_Sequence) {
+                        walk(node.expressions[node.expressions.length - 1]);
+                        return true;
+                    }
+                    if (node instanceof AST_String) {
+                        add(node.value, keep);
+                        return true;
+                    }
+                    if (node instanceof AST_Conditional) {
+                        walk(node.consequent);
+                        walk(node.alternative);
+                        return true;
+                    }
+                    throw out;
+                }));
+            })(node);
+        } catch(ex) {
+            if (ex !== out) throw ex;
+        }
+    }
+
     function mangleStrings(node) {
-        return node.transform(new TreeTransformer(function(node) {
+        return node.transform(new TreeTransformer(function(node){
             if (node instanceof AST_Sequence) {
                 var last = node.expressions.length - 1;
                 node.expressions[last] = mangleStrings(node.expressions[last]);
-            } else if (node instanceof AST_String) {
+            }
+            else if (node instanceof AST_String) {
                 node.value = mangle(node.value);
-            } else if (node instanceof AST_Conditional) {
+            }
+            else if (node instanceof AST_Conditional) {
                 node.consequent = mangleStrings(node.consequent);
                 node.alternative = mangleStrings(node.alternative);
             }

lib/scope.js

@@ -43,209 +43,297 @@
 
 "use strict";
 
-function SymbolDef(scope, orig, init) {
+function SymbolDef(scope, index, orig) {
     this.name = orig.name;
     this.orig = [ orig ];
-    this.init = init;
-    this.eliminated = 0;
     this.scope = scope;
     this.references = [];
-    this.replaced = 0;
     this.global = false;
+    this.export = false;
     this.mangled_name = null;
+    this.object_destructuring_arg = false;
     this.undeclared = false;
+    this.index = index;
     this.id = SymbolDef.next_id++;
-    this.lambda = orig instanceof AST_SymbolLambda;
-}
+};
 
 SymbolDef.next_id = 1;
 
 SymbolDef.prototype = {
     unmangleable: function(options) {
-        return this.global && !options.toplevel
+        if (!options) options = {};
+
+        return (this.global && !options.toplevel)
+            || this.export
+            || this.object_destructuring_arg
             || this.undeclared
-            || !options.eval && this.scope.pinned()
-            || options.keep_fnames
+            || (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
+            || (options.keep_fnames
                 && (this.orig[0] instanceof AST_SymbolLambda
-                    || this.orig[0] instanceof AST_SymbolDefun);
+                    || this.orig[0] instanceof AST_SymbolDefun))
+            || this.orig[0] instanceof AST_SymbolMethod
+            || (options.keep_classnames
+                && (this.orig[0] instanceof AST_SymbolClass
+                    || this.orig[0] instanceof AST_SymbolDefClass));
     },
     mangle: function(options) {
         var cache = options.cache && options.cache.props;
         if (this.global && cache && cache.has(this.name)) {
             this.mangled_name = cache.get(this.name);
-        } else if (!this.mangled_name && !this.unmangleable(options)) {
+        }
+        else if (!this.mangled_name && !this.unmangleable(options)) {
+            var s = this.scope;
+            var sym = this.orig[0];
+            if (options.ie8 && sym instanceof AST_SymbolLambda)
+                s = s.parent_scope;
             var def;
-            if (def = this.redefined()) {
+            if (this.defun && (def = this.defun.variables.get(this.name))) {
                 this.mangled_name = def.mangled_name || def.name;
-            } else {
-                this.mangled_name = next_mangled_name(this.scope, options, this);
-            }
+            } else
+                this.mangled_name = s.next_mangled(options, this);
             if (this.global && cache) {
                 cache.set(this.name, this.mangled_name);
             }
         }
-    },
-    redefined: function() {
-        return this.defun && this.defun.variables.get(this.name);
     }
 };
 
-AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
+AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     options = defaults(options, {
         cache: null,
         ie8: false,
+        safari10: false,
     });
 
     // pass 1: setup scope chaining and handle definitions
     var self = this;
     var scope = self.parent_scope = null;
+    var labels = new Dictionary();
     var defun = null;
-    var tw = new TreeWalker(function(node, descend) {
-        if (node instanceof AST_Catch) {
+    var in_destructuring = null;
+    var in_export = false;
+    var in_block = 0;
+    var for_scopes = [];
+    var tw = new TreeWalker(function(node, descend){
+        if (node.is_block_scope()) {
             var save_scope = scope;
             scope = new AST_Scope(node);
             scope.init_scope_vars(save_scope);
+            if (!(node instanceof AST_Scope)) {
+                scope.uses_with = save_scope.uses_with;
+                scope.uses_eval = save_scope.uses_eval;
+                scope.directives = save_scope.directives;
+            }
+            if (options.safari10) {
+                if (node instanceof AST_For || node instanceof AST_ForIn) {
+                    for_scopes.push(scope);
+                }
+            }
             descend();
             scope = save_scope;
             return true;
         }
+        if (node instanceof AST_Destructuring && node.is_array === false) {
+            in_destructuring = node;  // These don't nest
+            descend();
+            in_destructuring = null;
+            return true;
+        }
         if (node instanceof AST_Scope) {
             node.init_scope_vars(scope);
             var save_scope = scope;
             var save_defun = defun;
+            var save_labels = labels;
             defun = scope = node;
+            labels = new Dictionary();
             descend();
             scope = save_scope;
             defun = save_defun;
+            labels = save_labels;
+            return true;        // don't descend again in TreeWalker
+        }
+        if (node instanceof AST_Export) {
+            in_export = true;
+            descend();
+            in_export = false;
             return true;
         }
+        if (node instanceof AST_BlockStatement
+            || node instanceof AST_Switch
+            || node instanceof AST_Try
+            || node instanceof AST_Catch
+            || node instanceof AST_Finally) {
+            in_block++;
+            descend();
+            in_block--;
+            return true;
+        }
+        if (node instanceof AST_LabeledStatement) {
+            var l = node.label;
+            if (labels.has(l.name)) {
+                throw new Error(string_template("Label {name} defined twice", l));
+            }
+            labels.set(l.name, l);
+            descend();
+            labels.del(l.name);
+            return true;        // no descend again
+        }
         if (node instanceof AST_With) {
-            for (var s = scope; s; s = s.parent_scope) s.uses_with = true;
+            for (var s = scope; s; s = s.parent_scope)
+                s.uses_with = true;
             return;
         }
         if (node instanceof AST_Symbol) {
             node.scope = scope;
         }
+        if (node instanceof AST_SymbolFunarg) {
+            node.object_destructuring_arg = !!in_destructuring;
+        }
         if (node instanceof AST_Label) {
             node.thedef = node;
             node.references = [];
         }
-        if (node instanceof AST_SymbolDefun) {
-            // This should be defined in the parent scope, as we encounter the
-            // AST_Defun node before getting to its AST_Symbol.
-            (node.scope = defun.parent_scope.resolve()).def_function(node, defun);
-        } else if (node instanceof AST_SymbolLambda) {
-            var def = defun.def_function(node, node.name == "arguments" ? undefined : defun);
-            if (options.ie8) def.defun = defun.parent_scope.resolve();
-        } else if (node instanceof AST_SymbolVar) {
-            defun.def_variable(node, node.TYPE == "SymbolVar" ? null : undefined);
+        if (node instanceof AST_SymbolLambda) {
+            defun.def_function(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolDefun) {
+            // Careful here, the scope where this should be defined is
+            // the parent scope.  The reason is that we enter a new
+            // scope when we encounter the AST_Defun node (which is
+            // instanceof AST_Scope) but we get to the symbol a bit
+            // later.
+            var parent_lambda = defun.parent_scope;
+            while (parent_lambda.is_block_scope()) {
+                parent_lambda = parent_lambda.parent_scope;
+            }
+            (node.scope = parent_lambda).def_function(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolClass) {
+            defun.def_variable(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolImport) {
+            scope.def_variable(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolDefClass) {
+            // This deals with the name of the class being available
+            // inside the class.
+            (node.scope = defun.parent_scope).def_function(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolVar
+            || node instanceof AST_SymbolLet
+            || node instanceof AST_SymbolConst) {
+            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node, in_export, in_block);
+            def.destructuring = in_destructuring;
             if (defun !== scope) {
                 node.mark_enclosed(options);
                 var def = scope.find_variable(node);
                 if (node.thedef !== def) {
                     node.thedef = def;
+                    node.reference(options);
                 }
-                node.reference(options);
             }
-        } else if (node instanceof AST_SymbolCatch) {
-            scope.def_variable(node).defun = defun;
+        }
+        else if (node instanceof AST_SymbolCatch) {
+            scope.def_variable(node, in_export, in_block).defun = defun;
+        }
+        else if (node instanceof AST_LabelRef) {
+            var sym = labels.get(node.name);
+            if (!sym) throw new Error(string_template("Undefined label {name} [{line},{col}]", {
+                name: node.name,
+                line: node.start.line,
+                col: node.start.col
+            }));
+            node.thedef = sym;
         }
     });
     self.walk(tw);
 
     // pass 2: find back references and eval
-    self.globals = new Dictionary();
-    var tw = new TreeWalker(function(node) {
-        if (node instanceof AST_LoopControl) {
-            if (node.label) node.label.thedef.references.push(node);
+    var func = null;
+    var cls = null;
+    var globals = self.globals = new Dictionary();
+    var tw = new TreeWalker(function(node, descend){
+        if (node instanceof AST_Lambda) {
+            var prev_func = func;
+            func = node;
+            descend();
+            func = prev_func;
+            return true;
+        }
+        if (node instanceof AST_Class) {
+            var prev_cls = cls;
+            cls = node;
+            descend();
+            cls = prev_cls;
+            return true;
+        }
+        if (node instanceof AST_LoopControl && node.label) {
+            node.label.thedef.references.push(node);
             return true;
         }
         if (node instanceof AST_SymbolRef) {
             var name = node.name;
+            if (name == "eval" && tw.parent() instanceof AST_Call) {
+                for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
+                    s.uses_eval = true;
+                }
+            }
             var sym = node.scope.find_variable(name);
+            if (node.scope instanceof AST_Lambda && name == "arguments") {
+                node.scope.uses_arguments = true;
+            }
             if (!sym) {
                 sym = self.def_global(node);
-            } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
-                sym.scope.uses_arguments = true;
-            }
-            if (name == "eval") {
-                var parent = tw.parent();
-                if (parent.TYPE == "Call" && parent.expression === node) {
-                    for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
-                        s.uses_eval = true;
-                    }
-                } else if (sym.undeclared) {
-                    self.uses_eval = true;
-                }
             }
             node.thedef = sym;
             node.reference(options);
             return true;
         }
-        // ensure mangling works if catch reuses a scope variable
-        if (node instanceof AST_SymbolCatch) {
-            var def = node.definition().redefined();
-            if (def) for (var s = node.scope; s; s = s.parent_scope) {
-                push_uniq(s.enclosed, def);
-                if (s === def.scope) break;
-            }
-            return true;
-        }
     });
     self.walk(tw);
 
     // pass 3: fix up any scoping issue with IE8
-    if (options.ie8) self.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_SymbolCatch) {
-            var scope = node.thedef.defun;
-            if (scope.name instanceof AST_SymbolLambda && scope.name.name == node.name) {
-                scope = scope.parent_scope.resolve();
+    if (options.ie8) {
+        self.walk(new TreeWalker(function(node, descend) {
+            if (node instanceof AST_SymbolCatch) {
+                var name = node.name;
+                var refs = node.thedef.references;
+                var scope = node.thedef.defun;
+                var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
+                refs.forEach(function(ref) {
+                    ref.thedef = def;
+                    ref.reference(options);
+                });
+                node.thedef = def;
+                return true;
             }
-            redefine(node, scope);
-            return true;
-        }
-        if (node instanceof AST_SymbolLambda) {
-            var def = node.thedef;
-            redefine(node, node.scope.parent_scope.resolve());
-            if (typeof node.thedef.init !== "undefined") {
-                node.thedef.init = false;
-            } else if (def.init) {
-                node.thedef.init = def.init;
-            }
-            return true;
-        }
-    }));
+        }));
+    }
 
-    function redefine(node, scope) {
-        var name = node.name;
-        var old_def = node.thedef;
-        var new_def = scope.find_variable(name);
-        if (new_def) {
-            var redef;
-            while (redef = new_def.redefined()) new_def = redef;
-        } else {
-            new_def = self.globals.get(name);
+    // pass 4: add symbol definitions to loop scopes
+    // Safari/Webkit bug workaround - loop init let variable shadowing argument.
+    // https://github.com/mishoo/UglifyJS2/issues/1753
+    // https://bugs.webkit.org/show_bug.cgi?id=171041
+    if (options.safari10) {
+        for (var i = 0; i < for_scopes.length; i++) {
+            var scope = for_scopes[i];
+            scope.parent_scope.variables.each(function(def) {
+                push_uniq(scope.enclosed, def);
+            });
         }
-        if (new_def) {
-            new_def.orig.push(node);
-        } else {
-            new_def = scope.def_variable(node);
-        }
-        old_def.orig.concat(old_def.references).forEach(function(node) {
-            node.thedef = new_def;
-            node.reference(options);
-        });
-        if (old_def.lambda) new_def.lambda = true;
-        if (new_def.undeclared) self.variables.set(name, new_def);
+    }
+
+    if (options.cache) {
+        this.cname = options.cache.cname;
     }
 });
 
-AST_Toplevel.DEFMETHOD("def_global", function(node) {
+AST_Toplevel.DEFMETHOD("def_global", function(node){
     var globals = this.globals, name = node.name;
     if (globals.has(name)) {
         return globals.get(name);
     } else {
-        var g = new SymbolDef(this, node);
+        var g = new SymbolDef(this, globals.size(), node);
         g.undeclared = true;
         g.global = true;
         globals.set(name, g);
@@ -253,7 +341,7 @@ AST_Toplevel.DEFMETHOD("def_global", function(node) {
     }
 });
 
-AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope) {
+AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope){
     this.variables = new Dictionary();  // map name to AST_SymbolVar (variables defined in this scope; includes functions)
     this.functions = new Dictionary();  // map name to AST_SymbolDefun (functions defined in this scope)
     this.uses_with = false;             // will be set to true if this or some nested scope uses the `with` statement
@@ -263,10 +351,27 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope) {
     this.cname = -1;                    // the current index for mangling functions/variables
 });
 
-AST_Lambda.DEFMETHOD("init_scope_vars", function() {
+AST_Node.DEFMETHOD("is_block_scope", function(){
+    return false; // Behaviour will be overridden by AST_Block
+});
+
+AST_Block.DEFMETHOD("is_block_scope", function(){
+    return (
+        !(this instanceof AST_Lambda) &&
+        !(this instanceof AST_Toplevel) &&
+        !(this instanceof AST_Class) &&
+        !(this instanceof AST_SwitchBranch)
+    );
+});
+
+AST_IterationStatement.DEFMETHOD("is_block_scope", function(){
+     return true;
+});
+
+AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     AST_Scope.prototype.init_scope_vars.apply(this, arguments);
     this.uses_arguments = false;
-    this.def_variable(new AST_SymbolFunarg({
+    this.def_variable(new AST_SymbolConst({
         name: "arguments",
         start: this.start,
         end: this.end
@@ -275,7 +380,8 @@ AST_Lambda.DEFMETHOD("init_scope_vars", function() {
 
 AST_Symbol.DEFMETHOD("mark_enclosed", function(options) {
     var def = this.definition();
-    for (var s = this.scope; s; s = s.parent_scope) {
+    var s = this.scope;
+    while (s) {
         push_uniq(s.enclosed, def);
         if (options.keep_fnames) {
             s.functions.each(function(d) {
@@ -283,6 +389,7 @@ AST_Symbol.DEFMETHOD("mark_enclosed", function(options) {
             });
         }
         if (s === def.scope) break;
+        s = s.parent_scope;
     }
 });
 
@@ -291,341 +398,297 @@ AST_Symbol.DEFMETHOD("reference", function(options) {
     this.mark_enclosed(options);
 });
 
-AST_Scope.DEFMETHOD("find_variable", function(name) {
+AST_Scope.DEFMETHOD("find_variable", function(name){
     if (name instanceof AST_Symbol) name = name.name;
     return this.variables.get(name)
         || (this.parent_scope && this.parent_scope.find_variable(name));
 });
 
-AST_Scope.DEFMETHOD("def_function", function(symbol, init) {
-    var def = this.def_variable(symbol, init);
-    if (!def.init || def.init instanceof AST_Defun) def.init = init;
-    this.functions.set(symbol.name, def);
-    return def;
+AST_Scope.DEFMETHOD("def_function", function(symbol, in_export, in_block){
+    this.functions.set(symbol.name, this.def_variable(symbol, in_export, in_block));
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol, init) {
-    var def = this.variables.get(symbol.name);
-    if (def) {
-        def.orig.push(symbol);
-        if (def.init instanceof AST_Function) def.init = init;
-    } else {
-        def = new SymbolDef(this, symbol, init);
+AST_Scope.DEFMETHOD("def_variable", function(symbol, in_export, in_block){
+    var def;
+    if (!this.variables.has(symbol.name)) {
+        def = new SymbolDef(this, this.variables.size(), symbol);
         this.variables.set(symbol.name, def);
-        def.global = !this.parent_scope;
+        def.object_destructuring_arg = symbol.object_destructuring_arg;
+        if (in_export) {
+            def.export = true;
+        }
+        if (in_block && symbol instanceof AST_SymbolBlockDeclaration) {
+            def.global = false;
+        } else {
+            def.global = !this.parent_scope;
+        }
+    } else {
+        def = this.variables.get(symbol.name);
+        def.orig.push(symbol);
     }
     return symbol.thedef = def;
 });
 
-AST_Lambda.DEFMETHOD("resolve", return_this);
-AST_Scope.DEFMETHOD("resolve", function() {
-    return this.parent_scope.resolve();
+AST_Scope.DEFMETHOD("next_mangled", function(options){
+    var ext = this.enclosed;
+    out: while (true) {
+        var m = base54(++this.cname);
+        if (!is_identifier(m)) continue; // skip over "do"
+
+        // https://github.com/mishoo/UglifyJS2/issues/242 -- do not
+        // shadow a name reserved from mangling.
+        if (options.reserved.indexOf(m) >= 0) continue;
+
+        // we must ensure that the mangled name does not shadow a name
+        // from some parent scope that is referenced in this or in
+        // inner scopes.
+        for (var i = ext.length; --i >= 0;) {
+            var sym = ext[i];
+            var name = sym.mangled_name || (sym.unmangleable(options) && sym.name);
+            if (m == name) continue out;
+        }
+        return m;
+    }
 });
-AST_Toplevel.DEFMETHOD("resolve", return_this);
 
-function names_in_use(scope, options) {
-    var names = scope.names_in_use;
-    if (!names) {
-        scope.names_in_use = names = Object.create(scope.mangled_names || null);
-        scope.cname_holes = [];
-        var cache = options.cache && options.cache.props;
-        scope.enclosed.forEach(function(def) {
-            if (def.unmangleable(options)) names[def.name] = true;
-            if (def.global && cache && cache.has(def.name)) {
-                names[cache.get(def.name)] = true;
-            }
-        });
-    }
-    return names;
-}
+AST_Function.DEFMETHOD("next_mangled", function(options, def){
+    // #179, #326
+    // in Safari strict mode, something like (function x(x){...}) is a syntax error;
+    // a function expression's argument cannot shadow the function expression's name
+
+    var tricky_def = def.orig[0] instanceof AST_SymbolFunarg && this.name && this.name.definition();
+
+    // the function's mangled_name is null when keep_fnames is true
+    var tricky_name = tricky_def ? tricky_def.mangled_name || tricky_def.name : null;
 
-function next_mangled_name(scope, options, def) {
-    var in_use = names_in_use(scope, options);
-    var holes = scope.cname_holes;
-    var names = Object.create(null);
-    var scopes = [ scope ];
-    def.references.forEach(function(sym) {
-        var scope = sym.scope;
-        do {
-            if (scopes.indexOf(scope) < 0) {
-                for (var name in names_in_use(scope, options)) {
-                    names[name] = true;
-                }
-                scopes.push(scope);
-            } else break;
-        } while (scope = scope.parent_scope);
-    });
-    var name;
-    for (var i = 0; i < holes.length; i++) {
-        name = base54(holes[i]);
-        if (names[name]) continue;
-        holes.splice(i, 1);
-        scope.names_in_use[name] = true;
-        return name;
-    }
     while (true) {
-        name = base54(++scope.cname);
-        if (in_use[name] || RESERVED_WORDS[name] || options.reserved.has[name]) continue;
-        if (!names[name]) break;
-        holes.push(scope.cname);
+        var name = AST_Lambda.prototype.next_mangled.call(this, options, def);
+        if (!tricky_name || tricky_name != name)
+            return name;
     }
-    scope.names_in_use[name] = true;
-    return name;
-}
+});
 
-AST_Symbol.DEFMETHOD("unmangleable", function(options) {
+AST_Symbol.DEFMETHOD("unmangleable", function(options){
     var def = this.definition();
-    return !def || def.unmangleable(options);
+    return def && def.unmangleable(options);
 });
 
 // labels are always mangleable
-AST_Label.DEFMETHOD("unmangleable", return_false);
-
-AST_Symbol.DEFMETHOD("unreferenced", function() {
-    return !this.definition().references.length && !this.scope.pinned();
+AST_Label.DEFMETHOD("unmangleable", function(){
+    return false;
 });
 
-AST_Symbol.DEFMETHOD("definition", function() {
+AST_Symbol.DEFMETHOD("unreferenced", function(){
+    return this.definition().references.length == 0
+        && !(this.scope.uses_eval || this.scope.uses_with);
+});
+
+AST_Symbol.DEFMETHOD("undeclared", function(){
+    return this.definition().undeclared;
+});
+
+AST_LabelRef.DEFMETHOD("undeclared", function(){
+    return false;
+});
+
+AST_Label.DEFMETHOD("undeclared", function(){
+    return false;
+});
+
+AST_Symbol.DEFMETHOD("definition", function(){
     return this.thedef;
 });
 
-AST_Symbol.DEFMETHOD("global", function() {
+AST_Symbol.DEFMETHOD("global", function(){
     return this.definition().global;
 });
 
-function _default_mangler_options(options) {
-    options = defaults(options, {
+AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
+    return defaults(options, {
         eval        : false,
         ie8         : false,
+        keep_classnames: false,
         keep_fnames : false,
         reserved    : [],
         toplevel    : false,
     });
-    if (!Array.isArray(options.reserved)) options.reserved = [];
-    // Never mangle arguments
-    push_uniq(options.reserved, "arguments");
-    options.reserved.has = makePredicate(options.reserved);
-    return options;
-}
+});
 
-AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
-    options = _default_mangler_options(options);
+AST_Toplevel.DEFMETHOD("mangle_names", function(options){
+    options = this._default_mangler_options(options);
+
+    // Never mangle arguments
+    options.reserved.push('arguments');
 
     // We only need to mangle declaration nodes.  Special logic wired
     // into the code generator will display the mangled name if it's
     // present (and for AST_SymbolRef-s it'll use the mangled name of
     // the AST_SymbolDeclaration that it points to).
     var lname = -1;
+    var to_mangle = [];
 
-    if (options.cache && options.cache.props) {
-        var mangled_names = this.mangled_names = Object.create(null);
-        options.cache.props.each(function(mangled_name) {
-            mangled_names[mangled_name] = true;
+    if (options.cache) {
+        this.globals.each(function(symbol){
+            if (options.reserved.indexOf(symbol.name) < 0) {
+                to_mangle.push(symbol);
+            }
         });
     }
 
-    var redefined = [];
-    var tw = new TreeWalker(function(node, descend) {
+    var tw = new TreeWalker(function(node, descend){
         if (node instanceof AST_LabeledStatement) {
             // lname is incremented when we get to the AST_Label
             var save_nesting = lname;
             descend();
             lname = save_nesting;
-            return true;
+            return true;        // don't descend again in TreeWalker
         }
         if (node instanceof AST_Scope) {
-            descend();
-            if (options.cache && node instanceof AST_Toplevel) {
-                node.globals.each(mangle);
-            }
-            if (node instanceof AST_Defun && tw.has_directive("use asm")) {
-                var sym = new AST_SymbolRef(node.name);
-                sym.scope = node;
-                sym.reference(options);
-            }
-            node.variables.each(function(def) {
-                if (!defer_redef(def)) mangle(def);
+            var p = tw.parent(), a = [];
+            node.variables.each(function(symbol){
+                if (options.reserved.indexOf(symbol.name) < 0) {
+                    a.push(symbol);
+                }
             });
-            return true;
+            to_mangle.push.apply(to_mangle, a);
+            return;
         }
         if (node instanceof AST_Label) {
             var name;
-            do {
-                name = base54(++lname);
-            } while (RESERVED_WORDS[name]);
+            do name = base54(++lname); while (!is_identifier(name));
             node.mangled_name = name;
             return true;
         }
-        if (!options.ie8 && node instanceof AST_Catch) {
-            var def = node.argname.definition();
-            var redef = defer_redef(def, node.argname);
-            descend();
-            if (!redef) mangle(def);
-            return true;
+        var mangle_with_block_scope =
+            (!options.ie8 && node instanceof AST_SymbolCatch) ||
+            node instanceof AST_SymbolBlockDeclaration;
+        if (mangle_with_block_scope) {
+            to_mangle.push(node.definition());
+            return;
         }
     });
     this.walk(tw);
-    redefined.forEach(mangle);
-
-    function mangle(def) {
-        if (options.reserved.has[def.name]) return;
+    to_mangle.forEach(function(def){
+        if (def.destructuring && !def.destructuring.is_array) return;
         def.mangle(options);
+    });
+
+    if (options.cache) {
+        options.cache.cname = this.cname;
     }
+});
 
-    function defer_redef(def, node) {
-        var redef = def.redefined();
-        if (!redef) return false;
-        redefined.push(def);
-        def.references.forEach(reference);
-        if (node) reference(node);
-        return true;
-
-        function reference(sym) {
-            sym.thedef = redef;
-            sym.reference(options);
-            sym.thedef = def;
+AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
+    options = this._default_mangler_options(options);
+    var tw = new TreeWalker(function(node){
+        if (node instanceof AST_Constant)
+            base54.consider(node.print_to_string());
+        else if (node instanceof AST_Return)
+            base54.consider("return");
+        else if (node instanceof AST_Throw)
+            base54.consider("throw");
+        else if (node instanceof AST_Continue)
+            base54.consider("continue");
+        else if (node instanceof AST_Break)
+            base54.consider("break");
+        else if (node instanceof AST_Debugger)
+            base54.consider("debugger");
+        else if (node instanceof AST_Directive)
+            base54.consider(node.value);
+        else if (node instanceof AST_While)
+            base54.consider("while");
+        else if (node instanceof AST_Do)
+            base54.consider("do while");
+        else if (node instanceof AST_If) {
+            base54.consider("if");
+            if (node.alternative) base54.consider("else");
         }
-    }
-});
-
-AST_Toplevel.DEFMETHOD("find_colliding_names", function(options) {
-    var cache = options.cache && options.cache.props;
-    var avoid = Object.create(null);
-    options.reserved.forEach(to_avoid);
-    this.globals.each(add_def);
-    this.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_Scope) node.variables.each(add_def);
-        if (node instanceof AST_SymbolCatch) add_def(node.definition());
-    }));
-    return avoid;
-
-    function to_avoid(name) {
-        avoid[name] = true;
-    }
-
-    function add_def(def) {
-        var name = def.name;
-        if (def.global && cache && cache.has(name)) name = cache.get(name);
-        else if (!def.unmangleable(options)) return;
-        to_avoid(name);
-    }
-});
-
-AST_Toplevel.DEFMETHOD("expand_names", function(options) {
-    base54.reset();
+        else if (node instanceof AST_Var)
+            base54.consider("var");
+        else if (node instanceof AST_Const)
+            base54.consider("const");
+        else if (node instanceof AST_Lambda)
+            base54.consider("function");
+        else if (node instanceof AST_For)
+            base54.consider("for");
+        else if (node instanceof AST_ForIn)
+            base54.consider("for in");
+        else if (node instanceof AST_Switch)
+            base54.consider("switch");
+        else if (node instanceof AST_Case)
+            base54.consider("case");
+        else if (node instanceof AST_Default)
+            base54.consider("default");
+        else if (node instanceof AST_With)
+            base54.consider("with");
+        else if (node instanceof AST_ObjectSetter)
+            base54.consider("set" + (typeof node.key === "string" ? node.key : ""));
+        else if (node instanceof AST_ObjectGetter)
+            base54.consider("get" + (typeof node.key === "string" ? node.key : ""));
+        else if (node instanceof AST_ObjectKeyVal && typeof node.key === "string")
+            base54.consider(node.key);
+        else if (node instanceof AST_ConciseMethod && typeof node.key === "string")
+            base54.consider(node.key);
+        else if (node instanceof AST_New)
+            base54.consider("new");
+        else if (node instanceof AST_This)
+            base54.consider("this");
+        else if (node instanceof AST_Super)
+            base54.consider("super");
+        else if (node instanceof AST_Try)
+            base54.consider("try");
+        else if (node instanceof AST_Catch)
+            base54.consider("catch");
+        else if (node instanceof AST_Finally)
+            base54.consider("finally");
+        else if (node instanceof AST_Yield)
+            base54.consider("yield");
+        else if (node instanceof AST_Symbol && node.unmangleable(options))
+            base54.consider(node.name);
+        else if (node instanceof AST_Unary || node instanceof AST_Binary)
+            base54.consider(node.operator);
+        else if (node instanceof AST_Dot)
+            base54.consider(node.property);
+    });
+    this.walk(tw);
     base54.sort();
-    options = _default_mangler_options(options);
-    var avoid = this.find_colliding_names(options);
-    var cname = 0;
-    this.globals.each(rename);
-    this.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_Scope) node.variables.each(rename);
-        if (node instanceof AST_SymbolCatch) rename(node.definition());
-    }));
-
-    function next_name() {
-        var name;
-        do {
-            name = base54(cname++);
-        } while (avoid[name] || RESERVED_WORDS[name]);
-        return name;
-    }
-
-    function rename(def) {
-        if (def.global && options.cache) return;
-        if (def.unmangleable(options)) return;
-        if (options.reserved.has[def.name]) return;
-        var redef = def.redefined();
-        var name = redef ? redef.rename || redef.name : next_name();
-        def.rename = name;
-        def.orig.forEach(function(sym) {
-            sym.name = name;
-        });
-        def.references.forEach(function(sym) {
-            sym.name = name;
-        });
-    }
-});
-
-AST_Node.DEFMETHOD("tail_node", return_this);
-AST_Sequence.DEFMETHOD("tail_node", function() {
-    return this.expressions[this.expressions.length - 1];
-});
-
-AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options) {
-    options = _default_mangler_options(options);
-    base54.reset();
-    try {
-        AST_Node.prototype.print = function(stream, force_parens) {
-            this._print(stream, force_parens);
-            if (this instanceof AST_Symbol && !this.unmangleable(options)) {
-                base54.consider(this.name, -1);
-            } else if (options.properties) {
-                if (this instanceof AST_Dot) {
-                    base54.consider(this.property, -1);
-                } else if (this instanceof AST_Sub) {
-                    skip_string(this.property);
-                }
-            }
-        };
-        base54.consider(this.print_to_string(), 1);
-    } finally {
-        AST_Node.prototype.print = AST_Node.prototype._print;
-    }
-    base54.sort();
-
-    function skip_string(node) {
-        if (node instanceof AST_String) {
-            base54.consider(node.value, -1);
-        } else if (node instanceof AST_Conditional) {
-            skip_string(node.consequent);
-            skip_string(node.alternative);
-        } else if (node instanceof AST_Sequence) {
-            skip_string(node.tail_node());
-        }
-    }
 });
 
 var base54 = (function() {
-    var freq = Object.create(null);
-    function init(chars) {
-        var array = [];
-        for (var i = 0; i < chars.length; i++) {
-            var ch = chars[i];
-            array.push(ch);
-            freq[ch] = -1e-2 * i;
-        }
-        return array;
-    }
-    var digits = init("0123456789");
-    var leading = init("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_");
+    var string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_0123456789";
     var chars, frequency;
     function reset() {
-        frequency = Object.create(freq);
+        frequency = Object.create(null);
+        chars = string.split("").map(function(ch){ return ch.charCodeAt(0) });
+        chars.forEach(function(ch){ frequency[ch] = 0 });
     }
-    base54.consider = function(str, delta) {
+    base54.consider = function(str){
         for (var i = str.length; --i >= 0;) {
-            frequency[str[i]] += delta;
+            var code = str.charCodeAt(i);
+            if (code in frequency) ++frequency[code];
         }
     };
-    function compare(a, b) {
-        return frequency[b] - frequency[a];
-    }
     base54.sort = function() {
-        chars = leading.sort(compare).concat(digits.sort(compare));
+        chars = mergeSort(chars, function(a, b){
+            if (is_digit(a) && !is_digit(b)) return 1;
+            if (is_digit(b) && !is_digit(a)) return -1;
+            return frequency[b] - frequency[a];
+        });
     };
     base54.reset = reset;
     reset();
+    base54.get = function(){ return chars };
+    base54.freq = function(){ return frequency };
     function base54(num) {
         var ret = "", base = 54;
         num++;
         do {
             num--;
-            ret += chars[num % base];
+            ret += String.fromCharCode(chars[num % base]);
             num = Math.floor(num / base);
             base = 64;
         } while (num > 0);
         return ret;
-    }
+    };
     return base54;
 })();

lib/sourcemap.js

@@ -43,148 +43,55 @@
 
 "use strict";
 
-var vlq_char = characters("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
-var vlq_bits = vlq_char.reduce(function(map, ch, bits) {
-    map[ch] = bits;
-    return map;
-}, Object.create(null));
-
-function vlq_decode(indices, str) {
-    var value = 0;
-    var shift = 0;
-    for (var i = 0, j = 0; i < str.length; i++) {
-        var bits = vlq_bits[str[i]];
-        value += (bits & 31) << shift;
-        if (bits & 32) {
-            shift += 5;
-        } else {
-            indices[j++] += value & 1 ? 0x80000000 | -(value >> 1) : value >> 1;
-            value = shift = 0;
-        }
-    }
-    return j;
-}
-
-function vlq_encode(num) {
-    var result = "";
-    num = Math.abs(num) << 1 | num >>> 31;
-    do {
-        var bits = num & 31;
-        if (num >>>= 5) bits |= 32;
-        result += vlq_char[bits];
-    } while (num);
-    return result;
-}
-
-function create_array_map() {
-    var map = Object.create(null);
-    var array = [];
-    array.index = function(name) {
-        if (!HOP(map, name)) {
-            map[name] = array.length;
-            array.push(name);
-        }
-        return map[name];
-    };
-    return array;
-}
-
+// a small wrapper around fitzgen's source-map library
 function SourceMap(options) {
     options = defaults(options, {
-        content: false,
-        file: null,
-        root: null,
-        orig: null,
-    }, true);
-    var sources = create_array_map();
-    var sources_content = options.content && Object.create(null);
-    var names = create_array_map();
-    var mappings = "";
-    if (options.orig) Object.keys(options.orig).forEach(function(name) {
-        var map = options.orig[name];
-        var indices = [ 0, 0, 1, 0, 0 ];
-        options.orig[name] = {
-            names: map.names,
-            mappings: map.mappings.split(/;/).map(function(line) {
-                indices[0] = 0;
-                return line.split(/,/).map(function(segment) {
-                    return indices.slice(0, vlq_decode(indices, segment));
-                });
-            }),
-            sources: map.sources,
-        };
-        if (!sources_content || !map.sourcesContent) return;
-        for (var i = 0; i < map.sources.length; i++) {
-            var content = map.sourcesContent[i];
-            if (content) sources_content[map.sources[i]] = content;
-        }
+        file : null,
+        root : null,
+        orig : null,
+
+        orig_line_diff : 0,
+        dest_line_diff : 0,
     });
-    var generated_line = 1;
-    var generated_column = 0;
-    var source_index = 0;
-    var original_line = 1;
-    var original_column = 0;
-    var name_index = 0;
-    return {
-        add: options.orig ? function(source, gen_line, gen_col, orig_line, orig_col, name) {
-            var map = options.orig[source];
-            if (map) {
-                var segments = map.mappings[orig_line - 1];
-                if (!segments) return;
-                var indices;
-                for (var i = 0; i < segments.length; i++) {
-                    var col = segments[i][0];
-                    if (orig_col >= col) indices = segments[i];
-                    if (orig_col <= col) break;
-                }
-                if (!indices || indices.length < 4) return;
-                source = map.sources[indices[1]];
-                orig_line = indices[2];
-                orig_col = indices[3];
-                if (indices.length > 4) name = map.names[indices[4]];
+    var generator = new MOZ_SourceMap.SourceMapGenerator({
+        file       : options.file,
+        sourceRoot : options.root
+    });
+    var orig_map = options.orig && new MOZ_SourceMap.SourceMapConsumer(options.orig);
+
+    if (orig_map && Array.isArray(options.orig.sources)) {
+        orig_map._sources.toArray().forEach(function(source) {
+            var sourceContent = orig_map.sourceContentFor(source, true);
+            if (sourceContent) {
+                generator.setSourceContent(source, sourceContent);
             }
-            add(source, gen_line, gen_col, orig_line, orig_col, name);
-        } : add,
-        setSourceContent: sources_content ? function(source, content) {
-            sources_content[source] = content;
-        } : noop,
-        toString: function() {
-            return JSON.stringify({
-                version: 3,
-                file: options.file || undefined,
-                sourceRoot: options.root || undefined,
-                sources: sources,
-                sourcesContent: sources_content ? sources.map(function(source) {
-                    return sources_content[source] || null;
-                }) : undefined,
-                names: names,
-                mappings: mappings,
-            });
-        }
-    };
+        });
+    }
 
     function add(source, gen_line, gen_col, orig_line, orig_col, name) {
-        if (generated_line < gen_line) {
-            generated_column = 0;
-            do {
-                mappings += ";";
-            } while (++generated_line < gen_line);
-        } else if (mappings) {
-            mappings += ",";
+        if (orig_map) {
+            var info = orig_map.originalPositionFor({
+                line: orig_line,
+                column: orig_col
+            });
+            if (info.source === null) {
+                return;
+            }
+            source = info.source;
+            orig_line = info.line;
+            orig_col = info.column;
+            name = info.name || name;
         }
-        mappings += vlq_encode(gen_col - generated_column);
-        generated_column = gen_col;
-        var src_idx = sources.index(source);
-        mappings += vlq_encode(src_idx - source_index);
-        source_index = src_idx;
-        mappings += vlq_encode(orig_line - original_line);
-        original_line = orig_line;
-        mappings += vlq_encode(orig_col - original_column);
-        original_column = orig_col;
-        if (name != null) {
-            var name_idx = names.index(name);
-            mappings += vlq_encode(name_idx - name_index);
-            name_index = name_idx;
-        }
-    }
-}
+        generator.addMapping({
+            generated : { line: gen_line + options.dest_line_diff, column: gen_col },
+            original  : { line: orig_line + options.orig_line_diff, column: orig_col },
+            source    : source,
+            name      : name
+        });
+    };
+    return {
+        add        : add,
+        get        : function() { return generator },
+        toString   : function() { return JSON.stringify(generator.toJSON()); }
+    };
+};

lib/transform.js

@@ -43,6 +43,8 @@
 
 "use strict";
 
+// Tree transformer helpers.
+
 function TreeTransformer(before, after) {
     TreeWalker.call(this);
     this.before = before;
@@ -50,136 +52,207 @@ function TreeTransformer(before, after) {
 }
 TreeTransformer.prototype = new TreeWalker;
 
-(function(DEF) {
+(function(undefined){
+
+    function _(node, descend) {
+        node.DEFMETHOD("transform", function(tw, in_list){
+            var x, y;
+            tw.push(this);
+            if (tw.before) x = tw.before(this, descend, in_list);
+            if (x === undefined) {
+                if (!tw.after) {
+                    x = this;
+                    descend(x, tw);
+                } else {
+                    tw.stack[tw.stack.length - 1] = x = this;
+                    descend(x, tw);
+                    y = tw.after(x, in_list);
+                    if (y !== undefined) x = y;
+                }
+            }
+            tw.pop(this);
+            return x;
+        });
+    };
+
     function do_list(list, tw) {
-        return List(list, function(node) {
+        return MAP(list, function(node){
             return node.transform(tw, true);
         });
-    }
+    };
 
-    DEF(AST_Node, noop);
-    DEF(AST_LabeledStatement, function(self, tw) {
+    _(AST_Node, noop);
+
+    _(AST_LabeledStatement, function(self, tw){
         self.label = self.label.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_SimpleStatement, function(self, tw) {
+
+    _(AST_SimpleStatement, function(self, tw){
         self.body = self.body.transform(tw);
     });
-    DEF(AST_Block, function(self, tw) {
+
+    _(AST_Block, function(self, tw){
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Do, function(self, tw) {
-        self.body = self.body.transform(tw);
-        self.condition = self.condition.transform(tw);
-    });
-    DEF(AST_While, function(self, tw) {
+
+    _(AST_DWLoop, function(self, tw){
         self.condition = self.condition.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_For, function(self, tw) {
+
+    _(AST_For, function(self, tw){
         if (self.init) self.init = self.init.transform(tw);
         if (self.condition) self.condition = self.condition.transform(tw);
         if (self.step) self.step = self.step.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_ForIn, function(self, tw) {
+
+    _(AST_ForIn, function(self, tw){
         self.init = self.init.transform(tw);
         self.object = self.object.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_With, function(self, tw) {
+
+    _(AST_With, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_Exit, function(self, tw) {
+
+    _(AST_Exit, function(self, tw){
         if (self.value) self.value = self.value.transform(tw);
     });
-    DEF(AST_LoopControl, function(self, tw) {
+
+    _(AST_LoopControl, function(self, tw){
         if (self.label) self.label = self.label.transform(tw);
     });
-    DEF(AST_If, function(self, tw) {
+
+    _(AST_If, function(self, tw){
         self.condition = self.condition.transform(tw);
         self.body = self.body.transform(tw);
         if (self.alternative) self.alternative = self.alternative.transform(tw);
     });
-    DEF(AST_Switch, function(self, tw) {
+
+    _(AST_Switch, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Case, function(self, tw) {
+
+    _(AST_Case, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Try, function(self, tw) {
+
+    _(AST_Try, function(self, tw){
         self.body = do_list(self.body, tw);
         if (self.bcatch) self.bcatch = self.bcatch.transform(tw);
         if (self.bfinally) self.bfinally = self.bfinally.transform(tw);
     });
-    DEF(AST_Catch, function(self, tw) {
+
+    _(AST_Catch, function(self, tw){
         self.argname = self.argname.transform(tw);
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Definitions, function(self, tw) {
+
+    _(AST_Definitions, function(self, tw){
         self.definitions = do_list(self.definitions, tw);
     });
-    DEF(AST_VarDef, function(self, tw) {
+
+    _(AST_VarDef, function(self, tw){
         self.name = self.name.transform(tw);
         if (self.value) self.value = self.value.transform(tw);
     });
-    DEF(AST_Lambda, function(self, tw) {
+
+    _(AST_Destructuring, function(self, tw) {
+        self.names = do_list(self.names, tw);
+    });
+
+    _(AST_Lambda, function(self, tw){
         if (self.name) self.name = self.name.transform(tw);
         self.argnames = do_list(self.argnames, tw);
-        self.body = do_list(self.body, tw);
+        if (self.body instanceof AST_Node) {
+            self.body = self.body.transform(tw);
+        } else {
+            self.body = do_list(self.body, tw);
+        }
     });
-    DEF(AST_Call, function(self, tw) {
+
+    _(AST_Call, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.args = do_list(self.args, tw);
     });
-    DEF(AST_Sequence, function(self, tw) {
+
+    _(AST_Sequence, function(self, tw){
         self.expressions = do_list(self.expressions, tw);
     });
-    DEF(AST_Dot, function(self, tw) {
+
+    _(AST_Dot, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
-    DEF(AST_Sub, function(self, tw) {
+
+    _(AST_Sub, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.property = self.property.transform(tw);
     });
-    DEF(AST_Unary, function(self, tw) {
+
+    _(AST_Yield, function(self, tw){
+        if (self.expression) self.expression = self.expression.transform(tw);
+    });
+
+    _(AST_Unary, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
-    DEF(AST_Binary, function(self, tw) {
+
+    _(AST_Binary, function(self, tw){
         self.left = self.left.transform(tw);
         self.right = self.right.transform(tw);
     });
-    DEF(AST_Conditional, function(self, tw) {
+
+    _(AST_Conditional, function(self, tw){
         self.condition = self.condition.transform(tw);
         self.consequent = self.consequent.transform(tw);
         self.alternative = self.alternative.transform(tw);
     });
-    DEF(AST_Array, function(self, tw) {
+
+    _(AST_Array, function(self, tw){
         self.elements = do_list(self.elements, tw);
     });
-    DEF(AST_Object, function(self, tw) {
+
+    _(AST_Object, function(self, tw){
         self.properties = do_list(self.properties, tw);
     });
-    DEF(AST_ObjectProperty, function(self, tw) {
+
+    _(AST_ObjectProperty, function(self, tw){
+        if (self.key instanceof AST_Node) {
+            self.key = self.key.transform(tw);
+        }
         self.value = self.value.transform(tw);
     });
-})(function(node, descend) {
-    node.DEFMETHOD("transform", function(tw, in_list) {
-        var x, y;
-        tw.push(this);
-        if (tw.before) x = tw.before(this, descend, in_list);
-        if (typeof x === "undefined") {
-            x = this;
-            descend(x, tw);
-            if (tw.after) {
-                y = tw.after(x, in_list);
-                if (typeof y !== "undefined") x = y;
+
+    _(AST_Class, function(self, tw){
+        if (self.name) self.name = self.name.transform(tw);
+        if (self.extends) self.extends = self.extends.transform(tw);
+        self.properties = do_list(self.properties, tw);
+    });
+
+    _(AST_Expansion, function(self, tw){
+        self.expression = self.expression.transform(tw);
+    });
+
+    _(AST_Export, function(self, tw){
+        if (self.exported_value) self.exported_value = self.exported_value.transform(tw);
+    });
+
+    _(AST_TemplateString, function(self, tw) {
+        for (var i = 0; i < self.segments.length; i++) {
+            if (!(self.segments[i] instanceof AST_TemplateSegment)) {
+                self.segments[i] = self.segments[i].transform(tw);
             }
         }
-        tw.pop();
-        return x;
     });
-});
+
+    _(AST_PrefixedTemplateString, function(self, tw) {
+        self.template_string = self.template_string.transform(tw);
+    });
+
+})();

lib/utils.js

@@ -43,25 +43,40 @@
 
 "use strict";
 
+function array_to_hash(a) {
+    var ret = Object.create(null);
+    for (var i = 0; i < a.length; ++i)
+        ret[a[i]] = true;
+    return ret;
+};
+
+function slice(a, start) {
+    return Array.prototype.slice.call(a, start || 0);
+};
+
 function characters(str) {
     return str.split("");
-}
+};
 
 function member(name, array) {
     return array.indexOf(name) >= 0;
-}
+};
 
 function find_if(func, array) {
-    for (var i = array.length; --i >= 0;) if (func(array[i])) return array[i];
-}
+    for (var i = 0, n = array.length; i < n; ++i) {
+        if (func(array[i]))
+            return array[i];
+    }
+};
 
 function repeat_string(str, i) {
     if (i <= 0) return "";
     if (i == 1) return str;
     var d = repeat_string(str, i >> 1);
     d += d;
-    return i & 1 ? d + str : d;
-}
+    if (i & 1) d += str;
+    return d;
+};
 
 function configure_error_stack(fn) {
     Object.defineProperty(fn.prototype, "stack", {
@@ -70,7 +85,7 @@ function configure_error_stack(fn) {
             err.name = this.name;
             try {
                 throw err;
-            } catch (e) {
+            } catch(e) {
                 return e.stack;
             }
         }
@@ -80,23 +95,27 @@ function configure_error_stack(fn) {
 function DefaultsError(msg, defs) {
     this.message = msg;
     this.defs = defs;
-}
+};
 DefaultsError.prototype = Object.create(Error.prototype);
 DefaultsError.prototype.constructor = DefaultsError;
 DefaultsError.prototype.name = "DefaultsError";
 configure_error_stack(DefaultsError);
 
+DefaultsError.croak = function(msg, defs) {
+    throw new DefaultsError(msg, defs);
+};
+
 function defaults(args, defs, croak) {
-    if (args === true) args = {};
+    if (args === true)
+        args = {};
     var ret = args || {};
-    if (croak) for (var i in ret) if (HOP(ret, i) && !HOP(defs, i)) {
-        throw new DefaultsError("`" + i + "` is not a supported option", defs);
-    }
+    if (croak) for (var i in ret) if (HOP(ret, i) && !HOP(defs, i))
+        DefaultsError.croak("`" + i + "` is not a supported option", defs);
     for (var i in defs) if (HOP(defs, i)) {
         ret[i] = (args && HOP(args, i)) ? args[i] : defs[i];
     }
     return ret;
-}
+};
 
 function merge(obj, ext) {
     var count = 0;
@@ -105,7 +124,7 @@ function merge(obj, ext) {
         count++;
     }
     return count;
-}
+};
 
 function noop() {}
 function return_false() { return false; }
@@ -113,8 +132,8 @@ function return_true() { return true; }
 function return_this() { return this; }
 function return_null() { return null; }
 
-var List = (function() {
-    function List(a, f, backwards) {
+var MAP = (function(){
+    function MAP(a, f, backwards) {
         var ret = [], top = [], i;
         function doit() {
             var val = f(a[i], i);
@@ -127,7 +146,8 @@ var List = (function() {
                 } else {
                     top.push(val);
                 }
-            } else if (val !== skip) {
+            }
+            else if (val !== skip) {
                 if (val instanceof Splice) {
                     ret.push.apply(ret, backwards ? val.v.slice().reverse() : val.v);
                 } else {
@@ -135,8 +155,8 @@ var List = (function() {
                 }
             }
             return is_last;
-        }
-        if (Array.isArray(a)) {
+        };
+        if (a instanceof Array) {
             if (backwards) {
                 for (i = a.length; --i >= 0;) if (doit()) break;
                 ret.reverse();
@@ -144,56 +164,132 @@ var List = (function() {
             } else {
                 for (i = 0; i < a.length; ++i) if (doit()) break;
             }
-        } else {
+        }
+        else {
             for (i in a) if (HOP(a, i)) if (doit()) break;
         }
         return top.concat(ret);
-    }
-    List.at_top = function(val) { return new AtTop(val); };
-    List.splice = function(val) { return new Splice(val); };
-    List.last = function(val) { return new Last(val); };
-    var skip = List.skip = {};
-    function AtTop(val) { this.v = val; }
-    function Splice(val) { this.v = val; }
-    function Last(val) { this.v = val; }
-    return List;
+    };
+    MAP.at_top = function(val) { return new AtTop(val) };
+    MAP.splice = function(val) { return new Splice(val) };
+    MAP.last = function(val) { return new Last(val) };
+    var skip = MAP.skip = {};
+    function AtTop(val) { this.v = val };
+    function Splice(val) { this.v = val };
+    function Last(val) { this.v = val };
+    return MAP;
 })();
 
 function push_uniq(array, el) {
-    if (array.indexOf(el) < 0) return array.push(el);
-}
+    if (array.indexOf(el) < 0)
+        array.push(el);
+};
 
 function string_template(text, props) {
-    return text.replace(/\{(.+?)\}/g, function(str, p) {
+    return text.replace(/\{(.+?)\}/g, function(str, p){
         return props && props[p];
     });
-}
+};
 
 function remove(array, el) {
-    var index = array.indexOf(el);
-    if (index >= 0) array.splice(index, 1);
-}
+    for (var i = array.length; --i >= 0;) {
+        if (array[i] === el) array.splice(i, 1);
+    }
+};
 
-function makePredicate(words) {
-    if (!Array.isArray(words)) words = words.split(" ");
-    var map = Object.create(null);
-    words.forEach(function(word) {
-        map[word] = true;
+function mergeSort(array, cmp) {
+    if (array.length < 2) return array.slice();
+    function merge(a, b) {
+        var r = [], ai = 0, bi = 0, i = 0;
+        while (ai < a.length && bi < b.length) {
+            cmp(a[ai], b[bi]) <= 0
+                ? r[i++] = a[ai++]
+                : r[i++] = b[bi++];
+        }
+        if (ai < a.length) r.push.apply(r, a.slice(ai));
+        if (bi < b.length) r.push.apply(r, b.slice(bi));
+        return r;
+    };
+    function _ms(a) {
+        if (a.length <= 1)
+            return a;
+        var m = Math.floor(a.length / 2), left = a.slice(0, m), right = a.slice(m);
+        left = _ms(left);
+        right = _ms(right);
+        return merge(left, right);
+    };
+    return _ms(array);
+};
+
+function set_difference(a, b) {
+    return a.filter(function(el){
+        return b.indexOf(el) < 0;
     });
-    return map;
-}
+};
+
+function set_intersection(a, b) {
+    return a.filter(function(el){
+        return b.indexOf(el) >= 0;
+    });
+};
+
+// this function is taken from Acorn [1], written by Marijn Haverbeke
+// [1] https://github.com/marijnh/acorn
+function makePredicate(words) {
+    if (!(words instanceof Array)) words = words.split(" ");
+    var f = "", cats = [];
+    out: for (var i = 0; i < words.length; ++i) {
+        for (var j = 0; j < cats.length; ++j)
+            if (cats[j][0].length == words[i].length) {
+                cats[j].push(words[i]);
+                continue out;
+            }
+        cats.push([words[i]]);
+    }
+    function quote(word) {
+        return JSON.stringify(word).replace(/[\u2028\u2029]/g, function(s) {
+            switch (s) {
+                case "\u2028": return "\\u2028";
+                case "\u2029": return "\\u2029";
+            }
+            return s;
+        });
+    }
+    function compareTo(arr) {
+        if (arr.length == 1) return f += "return str === " + quote(arr[0]) + ";";
+        f += "switch(str){";
+        for (var i = 0; i < arr.length; ++i) f += "case " + quote(arr[i]) + ":";
+        f += "return true}return false;";
+    }
+    // When there are more than three length categories, an outer
+    // switch first dispatches on the lengths, to save on comparisons.
+    if (cats.length > 3) {
+        cats.sort(function(a, b) {return b.length - a.length;});
+        f += "switch(str.length){";
+        for (var i = 0; i < cats.length; ++i) {
+            var cat = cats[i];
+            f += "case " + cat[0].length + ":";
+            compareTo(cat);
+        }
+        f += "}";
+        // Otherwise, simply generate a flat `switch` statement.
+    } else {
+        compareTo(words);
+    }
+    return new Function("str", f);
+};
 
 function all(array, predicate) {
     for (var i = array.length; --i >= 0;)
-        if (!predicate(array[i], i))
+        if (!predicate(array[i]))
             return false;
     return true;
-}
+};
 
 function Dictionary() {
     this._values = Object.create(null);
     this._size = 0;
-}
+};
 Dictionary.prototype = {
     set: function(key, val) {
         if (!this.has(key)) ++this._size;
@@ -217,12 +313,6 @@ Dictionary.prototype = {
         return this;
     },
     has: function(key) { return ("$" + key) in this._values },
-    all: function(predicate) {
-        for (var i in this._values)
-            if (!predicate(this._values[i], i.substr(1)))
-                return false;
-        return true;
-    },
     each: function(f) {
         for (var i in this._values)
             f(this._values[i], i.substr(1));
@@ -236,13 +326,6 @@ Dictionary.prototype = {
             ret.push(f(this._values[i], i.substr(1)));
         return ret;
     },
-    clone: function() {
-        var ret = new Dictionary();
-        for (var i in this._values)
-            ret._values[i] = this._values[i];
-        ret._size = this._size;
-        return ret;
-    },
     toObject: function() { return this._values }
 };
 Dictionary.fromObject = function(obj) {
@@ -260,22 +343,20 @@ function HOP(obj, prop) {
 // a statement.
 function first_in_statement(stack) {
     var node = stack.parent(-1);
-    for (var i = 0, p; p = stack.parent(i++); node = p) {
-        if (p.TYPE == "Call") {
-            if (p.expression === node) continue;
-        } else if (p instanceof AST_Binary) {
-            if (p.left === node) continue;
-        } else if (p instanceof AST_Conditional) {
-            if (p.condition === node) continue;
-        } else if (p instanceof AST_PropAccess) {
-            if (p.expression === node) continue;
-        } else if (p instanceof AST_Sequence) {
-            if (p.expressions[0] === node) continue;
-        } else if (p instanceof AST_Statement) {
-            return p.body === node;
-        } else if (p instanceof AST_UnaryPostfix) {
-            if (p.expression === node) continue;
+    for (var i = 0, p; p = stack.parent(i); i++) {
+        if (p instanceof AST_Statement && p.body === node)
+            return true;
+        if ((p instanceof AST_Sequence      && p.expressions[0] === node) ||
+            (p instanceof AST_Call          && p.expression === node && !(p instanceof AST_New) ) ||
+            (p instanceof AST_Dot           && p.expression === node ) ||
+            (p instanceof AST_Sub           && p.expression === node ) ||
+            (p instanceof AST_Conditional   && p.condition === node  ) ||
+            (p instanceof AST_Binary        && p.left === node       ) ||
+            (p instanceof AST_UnaryPostfix  && p.expression === node ))
+        {
+            node = p;
+        } else {
+            return false;
         }
-        return false;
     }
 }

package.json

@@ -1,17 +1,23 @@
 {
-  "name": "uglify-js",
+  "name": "uglify-es",
   "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
+  "homepage": "https://github.com/mishoo/UglifyJS2/tree/harmony",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.9.1",
+  "version": "3.0.7",
   "engines": {
     "node": ">=0.8.0"
   },
   "maintainers": [
-    "Alex Lam <alexlamsl@gmail.com>",
     "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)"
   ],
-  "repository": "mishoo/UglifyJS2",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mishoo/UglifyJS2.git"
+  },
+  "bugs": {
+    "url": "https://github.com/mishoo/UglifyJS2/issues"
+  },
   "main": "tools/node.js",
   "bin": {
     "uglifyjs": "bin/uglifyjs"
@@ -23,37 +29,15 @@
     "LICENSE"
   ],
   "dependencies": {
-    "commander": "~2.20.3"
+    "commander": "~2.9.0",
+    "source-map": "~0.5.1"
   },
   "devDependencies": {
-    "acorn": "~7.1.0",
-    "semver": "~6.3.0"
+    "acorn": "~5.0.3",
+    "mocha": "~2.3.4"
   },
   "scripts": {
-    "test": "node test/compress.js && node test/mocha.js"
+    "test": "node test/run-tests.js"
   },
-  "keywords": [
-    "cli",
-    "compress",
-    "compressor",
-    "ecma",
-    "ecmascript",
-    "es",
-    "es5",
-    "javascript",
-    "js",
-    "jsmin",
-    "min",
-    "minification",
-    "minifier",
-    "minify",
-    "optimize",
-    "optimizer",
-    "pack",
-    "packer",
-    "parse",
-    "parser",
-    "uglifier",
-    "uglify"
-  ]
+  "keywords": ["uglify", "uglify-js", "minify", "minifier"]
 }

test/benchmark.js

@@ -4,45 +4,43 @@
 "use strict";
 
 var createHash = require("crypto").createHash;
-var fetch = require("./fetch");
-var spawn = require("child_process").spawn;
-var zlib = require("zlib");
+var fork = require("child_process").fork;
 var args = process.argv.slice(2);
-args.unshift("bin/uglifyjs");
-if (!args.length) args.push("-mc");
-args.push("--timings");
+if (!args.length) {
+    args.push("-mc");
+}
+args.push("--stats");
 var urls = [
-    "https://code.jquery.com/jquery-3.4.1.js",
-    "https://code.angularjs.org/1.7.8/angular.js",
-    "https://unpkg.com/mathjs@6.2.3/dist/math.js",
-    "https://unpkg.com/react@15.3.2/dist/react.js",
-    "https://cdnjs.cloudflare.com/ajax/libs/d3/5.12.0/d3.js",
+    "https://code.jquery.com/jquery-3.2.1.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.4/angular.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/mathjs/3.9.0/math.js",
     "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.js",
-    "https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.js",
-    "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.12.2/ember.prod.js",
-    "https://raw.githubusercontent.com/kangax/html-minifier/v4.0.0/dist/htmlminifier.js",
+    "https://unpkg.com/react@15.3.2/dist/react.js",
+    "http://builds.emberjs.com/tags/v2.11.0/ember.prod.js",
+    "https://cdn.jsdelivr.net/lodash/4.17.4/lodash.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.js",
 ];
 var results = {};
 var remaining = 2 * urls.length;
 function done() {
     if (!--remaining) {
         var failures = [];
-        var sum = { input: 0, output: 0, gzip: 0 };
         urls.forEach(function(url) {
             var info = results[url];
             console.log();
             console.log(url);
-            console.log(info.log);
+            var elapsed = 0;
+            console.log(info.log.replace(/Elapsed: ([0-9]+)\s*/g, function(match, time) {
+                elapsed += 1e-3 * parseInt(time);
+                return "";
+            }));
+            console.log("Run-time:", elapsed.toFixed(3), "s");
             console.log("Original:", info.input, "bytes");
             console.log("Uglified:", info.output, "bytes");
-            console.log("GZipped: ", info.gzip, "bytes");
             console.log("SHA1 sum:", info.sha1);
             if (info.code) {
                 failures.push(url);
             }
-            sum.input += info.input;
-            sum.output += info.output;
-            sum.gzip += info.gzip;
         });
         if (failures.length) {
             console.error("Benchmark failed:");
@@ -50,13 +48,6 @@ function done() {
                 console.error(url);
             });
             process.exit(1);
-        } else {
-            console.log();
-            console.log("Subtotal");
-            console.log();
-            console.log("Original:", sum.input, "bytes");
-            console.log("Uglified:", sum.output, "bytes");
-            console.log("GZipped: ", sum.gzip, "bytes");
         }
     }
 }
@@ -64,25 +55,17 @@ urls.forEach(function(url) {
     results[url] = {
         input: 0,
         output: 0,
-        gzip: 0,
         log: ""
     };
-    fetch(url, function(err, res) {
-        if (err) throw err;
-        var uglifyjs = spawn(process.argv[0], args, { silent: true });
+    require(url.slice(0, url.indexOf(":"))).get(url, function(res) {
+        var uglifyjs = fork("bin/uglifyjs", args, { silent: true });
         res.on("data", function(data) {
             results[url].input += data.length;
         }).pipe(uglifyjs.stdin);
-        var sha1 = createHash("sha1");
         uglifyjs.stdout.on("data", function(data) {
             results[url].output += data.length;
-        }).pipe(zlib.createGzip({
-            level: zlib.Z_BEST_COMPRESSION
-        })).on("data", function(data) {
-            results[url].gzip += data.length;
-            sha1.update(data);
-        }).on("end", function() {
-            results[url].sha1 = sha1.digest("hex");
+        }).pipe(createHash("sha1")).on("data", function(data) {
+            results[url].sha1 = data.toString("hex");
             done();
         });
         uglifyjs.stderr.setEncoding("utf8");

test/compress.js

@@ -1,458 +0,0 @@
-"use strict";
-
-require("../tools/exit");
-
-var assert = require("assert");
-var child_process = require("child_process");
-var fs = require("fs");
-var path = require("path");
-var sandbox = require("./sandbox");
-var semver = require("semver");
-var U = require("./node");
-
-var file = process.argv[2];
-var dir = path.resolve(path.dirname(module.filename), "compress");
-if (file) {
-    var minify_options = require("./ufuzz/options.json").map(JSON.stringify);
-    log("--- {file}", { file: file });
-    var tests = parse_test(path.resolve(dir, file));
-    process.exit(Object.keys(tests).filter(function(name) {
-        return !test_case(tests[name]);
-    }).length);
-} else {
-    var files = fs.readdirSync(dir).filter(function(name) {
-        return /\.js$/i.test(name);
-    });
-    var failures = 0;
-    var failed_files = Object.create(null);
-    (function next() {
-        var file = files.shift();
-        if (file) {
-            child_process.spawn(process.argv[0], [ process.argv[1], file ], {
-                stdio: [ "ignore", 1, 2 ]
-            }).on("exit", function(code) {
-                if (code) {
-                    failures += code;
-                    failed_files[file] = code;
-                }
-                next();
-            });
-        } else if (failures) {
-            console.error();
-            console.error("!!! Failed " + failures + " test case(s).");
-            console.error("!!! " + Object.keys(failed_files).join(", "));
-            process.exit(1);
-        }
-    })();
-}
-
-function evaluate(code) {
-    if (code instanceof U.AST_Node) code = make_code(code, { beautify: true });
-    return new Function("return(" + code + ")")();
-}
-
-function log() {
-    console.log("%s", tmpl.apply(null, arguments));
-}
-
-function make_code(ast, options) {
-    var stream = U.OutputStream(options);
-    ast.print(stream);
-    return stream.get();
-}
-
-function parse_test(file) {
-    var script = fs.readFileSync(file, "utf8");
-    // TODO try/catch can be removed after fixing https://github.com/mishoo/UglifyJS2/issues/348
-    try {
-        var ast = U.parse(script, {
-            filename: file
-        });
-    } catch (e) {
-        console.error("Caught error while parsing tests in " + file);
-        console.error(e);
-        process.exit(1);
-    }
-    var tests = Object.create(null);
-    var tw = new U.TreeWalker(function(node, descend) {
-        if (node instanceof U.AST_LabeledStatement
-            && tw.parent() instanceof U.AST_Toplevel) {
-            var name = node.label.name;
-            if (name in tests) {
-                throw new Error('Duplicated test name "' + name + '" in ' + file);
-            }
-            tests[name] = get_one_test(name, node.body);
-            return true;
-        }
-        if (!(node instanceof U.AST_Toplevel)) croak(node);
-    });
-    ast.walk(tw);
-    return tests;
-
-    function croak(node) {
-        throw new Error(tmpl("Can't understand test file {file} [{line},{col}]\n{code}", {
-            file: file,
-            line: node.start.line,
-            col: node.start.col,
-            code: make_code(node, { beautify: false })
-        }));
-    }
-
-    function read_string(stat) {
-        if (stat.TYPE == "SimpleStatement") {
-            var body = stat.body;
-            switch(body.TYPE) {
-              case "String":
-                return body.value;
-              case "Array":
-                return body.elements.map(function(element) {
-                    if (element.TYPE !== "String")
-                        throw new Error("Should be array of strings");
-                    return element.value;
-                }).join("\n");
-            }
-        }
-        throw new Error("Should be string or array of strings");
-    }
-
-    function get_one_test(name, block) {
-        var test = { name: name, options: {} };
-        var tw = new U.TreeWalker(function(node, descend) {
-            if (node instanceof U.AST_Assign) {
-                if (!(node.left instanceof U.AST_SymbolRef)) {
-                    croak(node);
-                }
-                var name = node.left.name;
-                test[name] = evaluate(node.right);
-                return true;
-            }
-            if (node instanceof U.AST_LabeledStatement) {
-                var label = node.label;
-                assert.ok([
-                    "input",
-                    "expect",
-                    "expect_exact",
-                    "expect_warnings",
-                    "expect_stdout",
-                    "node_version",
-                ].indexOf(label.name) >= 0, tmpl("Unsupported label {name} [{line},{col}]", {
-                    name: label.name,
-                    line: label.start.line,
-                    col: label.start.col
-                }));
-                var stat = node.body;
-                if (label.name == "expect_exact" || label.name == "node_version") {
-                    test[label.name] = read_string(stat);
-                } else if (label.name == "expect_stdout") {
-                    var body = stat.body;
-                    if (body instanceof U.AST_Boolean) {
-                        test[label.name] = body.value;
-                    } else if (body instanceof U.AST_Call) {
-                        var ctor = global[body.expression.name];
-                        assert.ok(ctor === Error || ctor.prototype instanceof Error, tmpl("Unsupported expect_stdout format [{line},{col}]", {
-                            line: label.start.line,
-                            col: label.start.col
-                        }));
-                        test[label.name] = ctor.apply(null, body.args.map(function(node) {
-                            assert.ok(node instanceof U.AST_Constant, tmpl("Unsupported expect_stdout format [{line},{col}]", {
-                                line: label.start.line,
-                                col: label.start.col
-                            }));
-                            return node.value;
-                        }));
-                    } else {
-                        test[label.name] = read_string(stat) + "\n";
-                    }
-                } else {
-                    test[label.name] = stat;
-                }
-                return true;
-            }
-        });
-        block.walk(tw);
-        return test;
-    }
-}
-
-// Try to reminify original input with standard options
-// to see if it matches expect_stdout.
-function reminify(orig_options, input_code, input_formatted, stdout) {
-    for (var i = 0; i < minify_options.length; i++) {
-        var options = JSON.parse(minify_options[i]);
-        if (options.compress) [
-            "keep_fargs",
-            "keep_fnames",
-        ].forEach(function(name) {
-            if (name in orig_options) {
-                options.compress[name] = orig_options[name];
-            }
-        });
-        var options_formatted = JSON.stringify(options, null, 4);
-        var result = U.minify(input_code, options);
-        if (result.error) {
-            log([
-                "!!! failed input reminify",
-                "---INPUT---",
-                "{input}",
-                "---OPTIONS---",
-                "{options}",
-                "--ERROR---",
-                "{error}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                options: options_formatted,
-                error: result.error,
-            });
-            return false;
-        } else {
-            var toplevel = sandbox.has_toplevel(options);
-            var expected = stdout[toplevel ? 1 : 0];
-            var actual = run_code(result.code, toplevel);
-            if (typeof expected != "string" && typeof actual != "string" && expected.name == actual.name) {
-                actual = expected;
-            }
-            if (!sandbox.same_stdout(expected, actual)) {
-                log([
-                    "!!! failed running reminified input",
-                    "---INPUT---",
-                    "{input}",
-                    "---OPTIONS---",
-                    "{options}",
-                    "---OUTPUT---",
-                    "{output}",
-                    "---EXPECTED {expected_type}---",
-                    "{expected}",
-                    "---ACTUAL {actual_type}---",
-                    "{actual}",
-                    "",
-                    "",
-                ].join("\n"), {
-                    input: input_formatted,
-                    options: options_formatted,
-                    output: result.code,
-                    expected_type: typeof expected == "string" ? "STDOUT" : "ERROR",
-                    expected: expected,
-                    actual_type: typeof actual == "string" ? "STDOUT" : "ERROR",
-                    actual: actual,
-                });
-                return false;
-            }
-        }
-    }
-    return true;
-}
-
-function run_code(code, toplevel) {
-    var result = sandbox.run_code(code, toplevel);
-    return typeof result == "string" ? result.replace(/\u001b\[\d+m/g, "") : result;
-}
-
-function test_case(test) {
-    log("    Running test [{name}]", { name: test.name });
-    var output_options = test.beautify || {};
-    var expect;
-    if (test.expect) {
-        expect = make_code(to_toplevel(test.expect, test.mangle), output_options);
-    } else {
-        expect = test.expect_exact;
-    }
-    var input = to_toplevel(test.input, test.mangle);
-    var input_code = make_code(input);
-    var input_formatted = make_code(test.input, {
-        beautify: true,
-        comments: "all",
-        keep_quoted_props: true,
-        quote_style: 3,
-    });
-    try {
-        U.parse(input_code);
-    } catch (ex) {
-        log([
-            "!!! Cannot parse input",
-            "---INPUT---",
-            "{input}",
-            "--PARSE ERROR--",
-            "{error}",
-            "",
-            "",
-        ].join("\n"), {
-            input: input_formatted,
-            error: ex,
-        });
-        return false;
-    }
-    var warnings_emitted = [];
-    if (test.expect_warnings) {
-        var expected_warnings = make_code(test.expect_warnings, {
-            beautify: false,
-            quote_style: 2, // force double quote to match JSON
-        });
-        U.AST_Node.log_function(function(text) {
-            warnings_emitted.push(text);
-        }, /"INFO: /.test(expected_warnings));
-    }
-    if (test.mangle && test.mangle.properties && test.mangle.properties.keep_quoted) {
-        var quoted_props = test.mangle.properties.reserved;
-        if (!Array.isArray(quoted_props)) quoted_props = [];
-        test.mangle.properties.reserved = quoted_props;
-        U.reserve_quoted_keys(input, quoted_props);
-    }
-    if (test.rename) {
-        input.figure_out_scope(test.mangle);
-        input.expand_names(test.mangle);
-    }
-    var cmp = new U.Compressor(test.options, true);
-    var output = cmp.compress(input);
-    output.figure_out_scope(test.mangle);
-    if (test.mangle) {
-        output.compute_char_frequency(test.mangle);
-        output.mangle_names(test.mangle);
-        if (test.mangle.properties) {
-            output = U.mangle_properties(output, test.mangle.properties);
-        }
-    }
-    output = make_code(output, output_options);
-    if (expect != output) {
-        log([
-            "!!! failed",
-            "---INPUT---",
-            "{input}",
-            "---OUTPUT---",
-            "{output}",
-            "---EXPECTED---",
-            "{expected}",
-            "",
-            "",
-        ].join("\n"), {
-            input: input_formatted,
-            output: output,
-            expected: expect
-        });
-        return false;
-    }
-    // expect == output
-    try {
-        U.parse(output);
-    } catch (ex) {
-        log([
-            "!!! Test matched expected result but cannot parse output",
-            "---INPUT---",
-            "{input}",
-            "---OUTPUT---",
-            "{output}",
-            "--REPARSE ERROR--",
-            "{error}",
-            "",
-            "",
-        ].join("\n"), {
-            input: input_formatted,
-            output: output,
-            error: ex,
-        });
-        return false;
-    }
-    if (test.expect_warnings) {
-        warnings_emitted = warnings_emitted.map(function(input) {
-            return input.split(process.cwd() + path.sep).join("").split(path.sep).join("/");
-        });
-        var actual_warnings = JSON.stringify(warnings_emitted);
-        if (expected_warnings != actual_warnings) {
-            log([
-                "!!! failed",
-                "---INPUT---",
-                "{input}",
-                "---EXPECTED WARNINGS---",
-                "{expected_warnings}",
-                "---ACTUAL WARNINGS---",
-                "{actual_warnings}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                expected_warnings: expected_warnings,
-                actual_warnings: actual_warnings,
-            });
-            return false;
-        }
-    }
-    if (test.expect_stdout && (!test.node_version || semver.satisfies(process.version, test.node_version))) {
-        var stdout = [ run_code(input_code), run_code(input_code, true) ];
-        var toplevel = sandbox.has_toplevel({
-            compress: test.options,
-            mangle: test.mangle
-        });
-        var actual = stdout[toplevel ? 1 : 0];
-        if (test.expect_stdout === true) {
-            test.expect_stdout = actual;
-        }
-        if (!sandbox.same_stdout(test.expect_stdout, actual)) {
-            log([
-                "!!! Invalid input or expected stdout",
-                "---INPUT---",
-                "{input}",
-                "---EXPECTED {expected_type}---",
-                "{expected}",
-                "---ACTUAL {actual_type}---",
-                "{actual}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
-                expected: test.expect_stdout,
-                actual_type: typeof actual == "string" ? "STDOUT" : "ERROR",
-                actual: actual,
-            });
-            return false;
-        }
-        actual = run_code(output, toplevel);
-        if (!sandbox.same_stdout(test.expect_stdout, actual)) {
-            log([
-                "!!! failed",
-                "---INPUT---",
-                "{input}",
-                "---EXPECTED {expected_type}---",
-                "{expected}",
-                "---ACTUAL {actual_type}---",
-                "{actual}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
-                expected: test.expect_stdout,
-                actual_type: typeof actual == "string" ? "STDOUT" : "ERROR",
-                actual: actual,
-            });
-            return false;
-        }
-        if (!reminify(test.options, input_code, input_formatted, stdout)) {
-            return false;
-        }
-    }
-    return true;
-}
-
-function tmpl() {
-    return U.string_template.apply(null, arguments);
-}
-
-function to_toplevel(input, mangle_options) {
-    if (!(input instanceof U.AST_BlockStatement)) throw new Error("Unsupported input syntax");
-    var directive = true;
-    var offset = input.start.line;
-    var tokens = [];
-    var toplevel = new U.AST_Toplevel(input.transform(new U.TreeTransformer(function(node) {
-        if (U.push_uniq(tokens, node.start)) node.start.line -= offset;
-        if (!directive || node === input) return;
-        if (node instanceof U.AST_SimpleStatement && node.body instanceof U.AST_String) {
-            return new U.AST_Directive(node.body);
-        } else {
-            directive = false;
-        }
-    })));
-    toplevel.figure_out_scope(mangle_options);
-    return toplevel;
-}

test/compress/arguments.js

@@ -1,778 +0,0 @@
-replace_index: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        properties: true,
-    }
-    input: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function() {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "undefined",
-        "42 42 undefined",
-        "42 42 undefined",
-        "a a undefined",
-        "42 42 undefined",
-    ]
-}
-
-replace_index_strict: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        properties: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        "use strict";
-        (function() {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "42 42 undefined",
-        "42 42 undefined",
-    ]
-}
-
-replace_index_keep_fargs: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        keep_fargs: false,
-        properties: true,
-    }
-    input: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function(argument_0, argument_1) {
-            console.log(argument_1, argument_1, arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "undefined",
-        "42 42 undefined",
-        "42 42 undefined",
-        "a a undefined",
-        "42 42 undefined",
-    ]
-}
-
-replace_index_keep_fargs_strict: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        keep_fargs: false,
-        properties: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        "use strict";
-        (function(argument_0, argument_1) {
-            console.log(argument_1, argument_1, arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "42 42 undefined",
-        "42 42 undefined",
-    ]
-}
-
-modified: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        (function(a, b) {
-            var c = arguments[0];
-            var d = arguments[1];
-            var a = "foo";
-            b++;
-            arguments[0] = "moo";
-            arguments[1] *= 2;
-            console.log(a, b, c, d, arguments[0], arguments[1]);
-        })("bar", 42);
-    }
-    expect: {
-        (function(a, b) {
-            var c = a;
-            var d = b;
-            var a = "foo";
-            b++;
-            a = "moo";
-            b *= 2;
-            console.log(a, b, c, d, a, b);
-        })("bar", 42);
-    }
-    expect_stdout: "moo 86 bar 42 moo 86"
-}
-
-modified_strict: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        (function(a, b) {
-            var c = arguments[0];
-            var d = arguments[1];
-            var a = "foo";
-            b++;
-            arguments[0] = "moo";
-            arguments[1] *= 2;
-            console.log(a, b, c, d, arguments[0], arguments[1]);
-        })("bar", 42);
-    }
-    expect: {
-        "use strict";
-        (function(a, b) {
-            var c = arguments[0];
-            var d = arguments[1];
-            var a = "foo";
-            b++;
-            arguments[0] = "moo";
-            arguments[1] *= 2;
-            console.log(a, b, c, d, arguments[0], arguments[1]);
-        })("bar", 42);
-    }
-    expect_stdout: "foo 43 bar 42 moo 84"
-}
-
-duplicate_argname: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        (function(a, b, a) {
-            console.log(a, b, arguments[0], arguments[1], arguments[2]);
-        })("foo", 42, "bar");
-    }
-    expect: {
-        (function(a, b, a) {
-            console.log(a, b, arguments[0], b, a);
-        })("foo", 42, "bar");
-    }
-    expect_stdout: "bar 42 foo 42 bar"
-}
-
-issue_3273: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        function f(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect: {
-        function f(a) {
-            console.log(a, a);
-            a++;
-            console.log(a, a);
-        }
-        f(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 1",
-    ]
-}
-
-issue_3273_reduce_vars: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        function f(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect: {
-        function f(a) {
-            console.log(a, a);
-            a++;
-            console.log(a, a);
-        }
-        f(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 1",
-    ]
-}
-
-issue_3273_local_strict: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        function f(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect: {
-        function f(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_local_strict_reduce_vars: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        function f(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect: {
-        function f(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_global_strict: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        "use strict";
-        function f(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect: {
-        "use strict";
-        function f(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_global_strict_reduce_vars: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        function f(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect: {
-        "use strict";
-        function f(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        }
-        f(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_keep_fargs_false: {
-    options = {
-        arguments: true,
-        keep_fargs: false,
-        reduce_vars: true,
-    }
-    input: {
-        (function() {
-            "use strict";
-            arguments[0]++;
-            console.log(arguments[0]);
-        })(0);
-    }
-    expect: {
-        (function(argument_0) {
-            "use strict";
-            argument_0++;
-            console.log(argument_0);
-        })(0);
-    }
-    expect_stdout: "1"
-}
-
-issue_3273_keep_fargs_strict: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-        reduce_vars: true,
-    }
-    input: {
-        (function() {
-            "use strict";
-            arguments[0]++;
-            console.log(arguments[0]);
-        })(0);
-    }
-    expect: {
-        (function(argument_0) {
-            "use strict";
-            argument_0++;
-            console.log(argument_0);
-        })(0);
-    }
-    expect_stdout: "1"
-}
-
-issue_3282_1: {
-    options = {
-        arguments: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(t) {
-            return function() {
-                t();
-            };
-        })(function() {
-            'use strict';
-            function e() {
-                return arguments[0];
-            }
-            e();
-            e();
-        })();
-    }
-    expect: {
-        (function() {
-            return function() {
-                (function() {
-                    "use strict";
-                    function e() {
-                        return arguments[0];
-                    }
-                    e();
-                    e();
-                })();
-            };
-        })()();
-    }
-    expect_stdout: true
-}
-
-issue_3282_1_passes: {
-    options = {
-        arguments: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(t) {
-            return function() {
-                t();
-            };
-        })(function() {
-            'use strict';
-            function e() {
-                return arguments[0];
-            }
-            e();
-            e();
-        })();
-    }
-    expect: {
-        (function() {
-            return function() {
-                (function() {
-                    "use strict";
-                    function e(argument_0) {
-                        return argument_0;
-                    }
-                    e();
-                    e();
-                })();
-            };
-        })()();
-    }
-    expect_stdout: true
-}
-
-issue_3282_2: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(f) {
-            f();
-        })(function() {
-            return (function(t) {
-                return function() {
-                    t();
-                };
-            })(function() {
-                'use strict';
-                function e() {
-                    return arguments[0];
-                }
-                e();
-                e();
-            })();
-        });
-    }
-    expect: {
-        (function() {
-            (function() {
-                return function(t) {
-                    return function() {
-                        t();
-                    };
-                }(function() {
-                    "use strict";
-                    function e() {
-                        return arguments[0];
-                    }
-                    e();
-                    e();
-                })();
-            })();
-        })();
-    }
-    expect_stdout: true
-}
-
-issue_3282_2_passes: {
-    options = {
-        arguments: true,
-        passes: 2,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(f) {
-            f();
-        })(function() {
-            return (function(t) {
-                return function() {
-                    t();
-                };
-            })(function() {
-                'use strict';
-                function e() {
-                    return arguments[0];
-                }
-                e();
-                e();
-            })();
-        });
-    }
-    expect: {
-        (function() {
-            (function() {
-                return function(t) {
-                    return function() {
-                        t();
-                    };
-                }(function() {
-                    "use strict";
-                    function e(argument_0) {
-                        return argument_0;
-                    }
-                    e();
-                    e();
-                })();
-            })();
-        })();
-    }
-    expect_stdout: true
-}
-
-issue_3420_1: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        console.log(function() {
-            return function() {
-                return arguments[0];
-            };
-        }().length);
-    }
-    expect: {
-        console.log(function() {
-            return function() {
-                return arguments[0];
-            };
-        }().length);
-    }
-    expect_stdout: "0"
-}
-
-issue_3420_2: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect: {
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect_stdout: true
-}
-
-issue_3420_3: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        "use strict";
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect: {
-        "use strict";
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect_stdout: true
-}
-
-issue_3420_4: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        !function() {
-            console.log(arguments[0]);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect: {
-        !function(argument_0) {
-            console.log(argument_0);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect_stdout: [
-        "42",
-        "undefined",
-    ]
-}
-
-issue_3420_5: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        "use strict";
-        !function() {
-            console.log(arguments[0]);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect: {
-        "use strict";
-        !function(argument_0) {
-            console.log(argument_0);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect_stdout: [
-        "42",
-        "undefined",
-    ]
-}
-
-issue_3420_6: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect: {
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect_stdout: "true"
-}
-
-issue_3420_7: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        "use strict";
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect: {
-        "use strict";
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect_stdout: "true"
-}

test/compress/arrays.js

@@ -1,3 +1,5 @@
+// NOTE trailing comma doesn't contribute to length of an array
+// That also means the array changes length if previous element is a hole too and got cut off
 holes_and_undefined: {
     input: {
         w = [1,,];
@@ -15,10 +17,9 @@ holes_and_undefined: {
 
 constant_join: {
     options = {
-        evaluate: true,
-        strings: true,
-        unsafe: true,
-    }
+        unsafe   : true,
+        evaluate : true
+    };
     input: {
         var a = [ "foo", "bar", "baz" ].join("");
         var a1 = [ "foo", "bar", "baz" ].join();
@@ -65,10 +66,9 @@ constant_join: {
 
 constant_join_2: {
     options = {
-        evaluate: true,
-        strings: true,
-        unsafe: true,
-    }
+        unsafe   : true,
+        evaluate : true
+    };
     input: {
         var a = [ "foo", "bar", boo(), "baz", "x", "y" ].join("");
         var b = [ "foo", "bar", boo(), "baz", "x", "y" ].join("-");
@@ -93,14 +93,85 @@ constant_join_2: {
     }
 }
 
+spread_with_variable_as_last_element: {
+    input: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
+    }
+    expect: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
+    }
+}
+
+spread_with_variable_in_middle: {
+    input: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
+    }
+    expect: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
+    }
+}
+
+spread_with_variable_at_front: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+}
+
+spread_with_variable_at_front_after_elisions: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+}
+
+spread_with_array_at_end: {
+    input: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+    expect: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+}
+
+spread_with_logical_expression_at_end: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 2, 3, ...[2+2]]
+    }
+    expect: {
+        var a = [1, 2, 3, ...[4]]
+    }
+}
+
+spread_with_logical_expression_at_middle: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 1, ...[1+1, 1+2, 2+3], 8]
+    }
+    expect: {
+        var a = [1, 1, ...[2, 3, 5], 8]
+    }
+}
+
 constant_join_3: {
     options = {
-        evaluate: true,
-        strings: true,
         unsafe: true,
-    }
+        evaluate: true,
+    };
     input: {
-        var foo, bar, baz;
         var a = [ null ].join();
         var b = [ , ].join();
         var c = [ , 1, , 3 ].join();
@@ -115,7 +186,6 @@ constant_join_3: {
         var l = [ foo, bar + "baz" ].join("");
     }
     expect: {
-        var foo, bar, baz;
         var a = "";
         var b = "";
         var c = ",1,,3";
@@ -133,224 +203,50 @@ constant_join_3: {
 
 for_loop: {
     options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        unsafe: true,
-        unused: true,
-    }
+        unsafe      : true,
+        unused      : true,
+        evaluate    : true,
+        reduce_vars : true
+    };
     input: {
         function f0() {
             var a = [1, 2, 3];
-            var b = 0;
-            for (var i = 0; i < a.length; i++)
-                b += a[i];
-            return b;
+            for (var i = 0; i < a.length; i++) {
+                console.log(a[i]);
+            }
         }
+
         function f1() {
             var a = [1, 2, 3];
-            var b = 0;
-            for (var i = 0, len = a.length; i < len; i++)
-                b += a[i];
-            return b;
+            for (var i = 0, len = a.length; i < len; i++) {
+                console.log(a[i]);
+            }
         }
+
         function f2() {
             var a = [1, 2, 3];
-            for (var i = 0; i < a.length; i++)
+            for (var i = 0; i < a.length; i++) {
                 a[i]++;
-            return a[2];
+            }
         }
-        console.log(f0(), f1(), f2());
     }
     expect: {
         function f0() {
             var a = [1, 2, 3];
-            var b = 0;
             for (var i = 0; i < 3; i++)
-                b += a[i];
-            return b;
+                console.log(a[i]);
         }
+
         function f1() {
             var a = [1, 2, 3];
-            var b = 0;
             for (var i = 0; i < 3; i++)
-                b += a[i];
-            return b;
+                console.log(a[i]);
         }
+
         function f2() {
             var a = [1, 2, 3];
             for (var i = 0; i < a.length; i++)
                 a[i]++;
-            return a[2];
-        }
-        console.log(f0(), f1(), f2());
-    }
-    expect_stdout: "6 6 4"
-}
-
-index: {
-    options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var a = [ 1, 2 ];
-        console.log(a[0], a[1]);
-    }
-    expect: {
-        console.log(1, 2);
-    }
-    expect_stdout: "1 2"
-}
-
-length: {
-    options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var a = [ 1, 2 ];
-        console.log(a.length);
-    }
-    expect: {
-        console.log(2);
-    }
-    expect_stdout: "2"
-}
-
-index_length: {
-    options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var a = [ 1, 2 ];
-        console.log(a[0], a.length);
-    }
-    expect: {
-        console.log(1, 2);
-    }
-    expect_stdout: "1 2"
-}
-
-constructor_bad: {
-    options = {
-        unsafe: true
-    }
-    input: {
-        try {
-            Array(NaN);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                new Array(NaN);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
-        }
-        try {
-            Array(3.14);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                new Array(3.14);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
         }
     }
-    expect: {
-        try {
-            Array(NaN);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                Array(NaN);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
-        }
-        try {
-            Array(3.14);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                Array(3.14);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
-        }
-    }
-    expect_stdout: [
-        "PASS",
-        "PASS",
-    ]
-    expect_warnings: [
-        "WARN: Invalid array length: 3.14 [test/compress/arrays.js:13,12]",
-        "WARN: Invalid array length: 3.14 [test/compress/arrays.js:17,16]",
-    ]
-}
-
-constructor_good: {
-    options = {
-        unsafe: true
-    }
-    input: {
-        console.log(Array());
-        console.log(Array(0));
-        console.log(Array(1));
-        console.log(Array(6));
-        console.log(Array(7));
-        console.log(Array(1, 2));
-        console.log(Array(false));
-        console.log(Array("foo"));
-        console.log(Array(Array));
-        console.log(new Array());
-        console.log(new Array(0));
-        console.log(new Array(1));
-        console.log(new Array(6));
-        console.log(new Array(7));
-        console.log(new Array(1, 2));
-        console.log(new Array(false));
-        console.log(new Array("foo"));
-        console.log(new Array(Array));
-    }
-    expect: {
-        console.log([]);
-        console.log([]);
-        console.log([,]);
-        console.log([,,,,,,]);
-        console.log(Array(7));
-        console.log([ 1, 2 ]);
-        console.log([ false ]);
-        console.log([ "foo" ]);
-        console.log(Array(Array));
-        console.log([]);
-        console.log([]);
-        console.log([,]);
-        console.log([,,,,,,]);
-        console.log(Array(7));
-        console.log([ 1, 2 ]);
-        console.log([ false ]);
-        console.log([ "foo" ]);
-        console.log(Array(Array));
-    }
-    expect_stdout: true
-    expect_warnings: []
 }

test/compress/arrow.js

@@ -0,0 +1,137 @@
+arrow_functions_without_body: {
+    input: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+    expect: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+}
+
+arrow_functions_with_body: {
+    input: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        }
+    }
+    expect: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        };
+    }
+}
+
+arrow_function_with_single_parameter_with_default: {
+    input: {
+        var foo = (a = 0) => doSomething(a);
+    }
+    expect_exact: "var foo=(a=0)=>doSomething(a);"
+}
+
+arrow_binding_pattern: {
+    input: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+    expect: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+}
+
+arrow_binding_pattern_strict: {
+    input: {
+        var foo = ([,]) => "foo";
+    }
+    expect_exact: 'var foo=([,])=>"foo";'
+}
+
+arrow_with_regexp: {
+    input: {
+        num => /\d{11,14}/.test( num )
+    }
+    expect: {
+        num => /\d{11,14}/.test( num )
+    }
+}

test/compress/ascii.js

@@ -13,7 +13,7 @@ ascii_only_true: {
                    "\x20\x21\x22\x23 ... \x7d\x7e\x7f\x80\x81 ... \xfe\xff\u0fff\uffff";
         }
     }
-    expect_exact: 'function f(){return"\\x000\\x001\\x007\\x008\\0"+"\\0\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\b\\t\\n\\v\\f\\r\\x0e\\x0f"+"\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f"+\' !"# ... }~\\x7f\\x80\\x81 ... \\xfe\\xff\\u0fff\\uffff\'}'
+    expect_exact: 'function f(){return"\\x000\\x001\\x007\\08\\0"+"\\0\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\b\\t\\n\\v\\f\\r\\x0e\\x0f"+"\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f"+\' !"# ... }~\\x7f\\x80\\x81 ... \\xfe\\xff\\u0fff\\uffff\'}'
 }
 
 ascii_only_false: {
@@ -31,5 +31,5 @@ ascii_only_false: {
                    "\x20\x21\x22\x23 ... \x7d\x7e\x7f\x80\x81 ... \xfe\xff\u0fff\uffff";
         }
     }
-    expect_exact: 'function f(){return"\\x000\\x001\\x007\\x008\\0"+"\\0\x01\x02\x03\x04\x05\x06\x07\\b\\t\\n\\v\\f\\r\x0e\x0f"+"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"+\' !"# ... }~\x7f\x80\x81 ... \xfe\xff\u0fff\uffff\'}'
+    expect_exact: 'function f(){return"\\x000\\x001\\x007\\08\\0"+"\\0\x01\x02\x03\x04\x05\x06\x07\\b\\t\\n\\v\\f\\r\x0e\x0f"+"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"+\' !"# ... }~\x7f\x80\x81 ... \xfe\xff\u0fff\uffff\'}'
 }

test/compress/asm.js

@@ -1,25 +1,25 @@
 asm_mixed: {
     options = {
-        assignments: true,
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        drop_debugger: true,
-        evaluate: true,
-        hoist_funs: true,
-        hoist_vars: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        keep_fnames: false,
-        loops: true,
-        negate_iife: true,
-        properties: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
+        sequences     : true,
+        properties    : true,
+        dead_code     : true,
+        drop_debugger : true,
+        conditionals  : true,
+        comparisons   : true,
+        evaluate      : true,
+        booleans      : true,
+        loops         : true,
+        unused        : true,
+        hoist_funs    : true,
+        keep_fargs    : true,
+        keep_fnames   : false,
+        hoist_vars    : true,
+        if_return     : true,
+        join_vars     : true,
+        cascade       : true,
+        side_effects  : true,
+        negate_iife   : true
+    };
     input: {
         // adapted from http://asmjs.org/spec/latest/
         function asm_GeometricMean(stdlib, foreign, buffer) {
@@ -96,7 +96,7 @@ asm_mixed: {
                 return +sum;
             }
             function geometricMean(start, end) {
-                return start |= 0, end |= 0, +exp(logSum(start, end) / (end - start | 0));
+                return start |= 0, end |= 0, +exp(+logSum(start, end) / +(end - start | 0));
             }
             var exp = stdlib.Math.exp, log = stdlib.Math.log, values = new stdlib.Float64Array(buffer);
             return { geometricMean: geometricMean };
@@ -104,131 +104,3 @@ asm_mixed: {
     }
 }
 
-asm_toplevel: {
-    options = {}
-    input: {
-        "use asm";
-        0.0;
-        function f() {
-            0.0;
-            (function(){
-                0.0;
-            });
-        }
-        0.0;
-    }
-    expect_exact: '"use asm";0.0;function f(){0.0;(function(){0.0})}0.0;'
-}
-
-asm_function_expression: {
-    options = {}
-    input: {
-        0.0;
-        var a = function() {
-            "use asm";
-            0.0;
-        }
-        function f() {
-            0.0;
-            return function(){
-                "use asm";
-                0.0;
-            }
-            0.0;
-        }
-        0.0;
-    }
-    expect_exact: '0;var a=function(){"use asm";0.0};function f(){0;return function(){"use asm";0.0};0}0;'
-}
-
-asm_nested_functions: {
-    options = {}
-    input: {
-        0.0;
-        function a() {
-            "use asm";
-            0.0;
-        }
-        0.0;
-        function b() {
-            0.0;
-            function c(){
-                "use asm";
-                0.0;
-            }
-            0.0;
-            function d(){
-                0.0;
-            }
-            0.0;
-        }
-        0.0;
-    }
-    expect_exact: '0;function a(){"use asm";0.0}0;function b(){0;function c(){"use asm";0.0}0;function d(){0}0}0;'
-}
-
-issue_3636_1: {
-    mangle = {}
-    input: {
-        function n(stdlib, foreign, buffer) {
-            "use asm";
-            function add(x, y) {
-                x = x | 0;
-                y = y | 0;
-                return x + y | 0;
-            }
-            return {
-                add: add
-            };
-        }
-        console.log(new n().add("foo", 42));
-    }
-    expect: {
-        function n(o, e, u) {
-            "use asm";
-            function d(n, o) {
-                n = n | 0;
-                o = o | 0;
-                return n + o | 0;
-            }
-            return {
-                add: d
-            };
-        }
-        console.log(new n().add("foo", 42));
-    }
-    expect_stdout: "42"
-}
-
-issue_3636_2: {
-    mangle = {}
-    input: {
-        var n = function(stdlib, foreign, buffer) {
-            "use asm";
-            function add(x, y) {
-                x = x | 0;
-                y = y | 0;
-                return x + y | 0;
-            }
-            return {
-                add: add
-            };
-        };
-        console.log(new n().add("foo", 42));
-    }
-    expect: {
-        var n = function(n, o, e) {
-            "use asm";
-            function r(n, o) {
-                n = n | 0;
-                o = o | 0;
-                return n + o | 0;
-            }
-            return {
-                add: r
-            };
-        };
-        console.log(new n().add("foo", 42));
-    }
-    expect_stdout: "42"
-}

test/compress/assignment.js

@@ -1,6 +1,5 @@
 op_equals_left_local_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -61,7 +60,6 @@ op_equals_left_local_var: {
 
 op_equals_right_local_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -125,7 +123,6 @@ op_equals_right_local_var: {
 }
 op_equals_left_global_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -182,7 +179,6 @@ op_equals_left_global_var: {
 
 op_equals_right_global_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -240,170 +236,3 @@ op_equals_right_global_var: {
         x = g() &   x;
     }
 }
-
-increment_decrement_1: {
-    options = {
-        assignments: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a) {
-            a += 1;
-            a -= 1;
-            return a;
-        }(42));
-    }
-    expect: {
-        console.log(function(a){
-            ++a;
-            --a;
-            return a;
-        }(42));
-    }
-    expect_stdout: "42"
-}
-
-increment_decrement_2: {
-    options = {
-        assignments: true,
-        passes: 2,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a) {
-            a = a + 1;
-            a = a - 1;
-            a += 1;
-            a -= 1;
-            return a;
-        }(42));
-    }
-    expect: {
-        console.log(function(a){
-            ++a;
-            --a;
-            ++a;
-            --a;
-            return a;
-        }(42));
-    }
-    expect_stdout: "42"
-}
-
-issue_3375_1: {
-    options = {
-        assignments: true,
-        reduce_vars: true,
-    }
-    input: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = b += 1;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = b += 1;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect_stdout: "string object1"
-}
-
-issue_3375_2: {
-    options = {
-        assignments: true,
-        reduce_vars: true,
-    }
-    input: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = b -= 1;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = --b;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect_stdout: "number NaN"
-}
-
-issue_3427: {
-    options = {
-        assignments: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            var a;
-            a || (a = {});
-        })();
-    }
-    expect: {}
-}
-
-issue_3429_1: {
-    options = {
-        assignments: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a = "PASS";
-        (function(b) {
-            b && (b = a = "FAIL");
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "PASS";
-        (function(b) {
-            b = b && (a = "FAIL");
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3429_2: {
-    options = {
-        assignments: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a;
-        (function(b) {
-            b || (b = a = "FAIL");
-        })(42);
-        console.log(a);
-    }
-    expect: {
-        var a;
-        (function(b) {
-            b = b || (a = "FAIL");
-        })(42);
-        console.log(a);
-    }
-    expect_stdout: "undefined"
-}

test/compress/block-scope.js

@@ -0,0 +1,177 @@
+
+let_statement: {
+    input: {
+        let x = 6;
+    }
+    expect_exact: "let x=6;"
+}
+
+do_not_hoist_let: {
+    options = {
+        hoist_vars: true,
+    };
+    input: {
+        function x() {
+            if (FOO) {
+                let let1;
+                let let2;
+                var var1;
+                var var2;
+            }
+        }
+    }
+    expect: {
+        function x() {
+            var var1, var2;
+            if (FOO) {
+                let let1;
+                let let2;
+            }
+        }
+    }
+}
+
+do_not_remove_anon_blocks_if_they_have_decls: {
+    input: {
+        function x() {
+            {
+                let x;
+            }
+            {
+                var x;
+            }
+            {
+                const y;
+                class Zee {};
+            }
+        }
+        {
+            let y;
+        }
+        {
+            var y;
+        }
+    }
+    expect: {
+        function x(){
+            {
+                let x
+            }
+            var x;
+            {
+                const y;
+                class Zee {}
+            }
+        }
+        {
+            let y
+        }
+        var y;
+    }
+}
+
+remove_unused_in_global_block: {
+    options = {
+        unused: true,
+    }
+    input: {
+        {
+            let x;
+            const y;
+            class Zee {};
+            var w;
+        }
+        let ex;
+        const why;
+        class Zed {};
+        var wut;
+        console.log(x, y, Zee);
+    }
+    expect: {
+        var w;
+        let ex;
+        const why;
+        class Zed {};
+        var wut;
+        console.log(x, y, Zee);
+    }
+}
+
+regression_block_scope_resolves: {
+    mangle = { };
+    options = {
+        dead_code: false
+    };
+    input: {
+        (function () {
+            if(1) {
+                let x;
+                const y;
+                class Zee {};
+            }
+            if(1) {
+                let ex;
+                const why;
+                class Zi {};
+            }
+            console.log(x, y, Zee, ex, why, Zi);
+        }());
+    }
+    expect: {
+        (function () {
+            if (1) {
+                let o;
+                const n;
+                class c {};
+            }
+            if (1) {
+                let o;
+                const n;
+                class c {};
+            }
+            console.log(x, y, Zee, ex, why, Zi);
+        }());
+    }
+}
+
+switch_block_scope_mangler: {
+    mangle = {}
+    input: {
+        var fn = function(code) {
+            switch (code) {
+                case 1:
+                    let apple = code + 1;
+                    let dog = code + 4;
+                    console.log(apple, dog);
+                    break;
+                case 2:
+                    let banana = code + 2;
+                    console.log(banana);
+                    break;
+                default:
+                    let cat = code + 3;
+                    console.log(cat);
+            }
+        };
+    }
+    expect: {
+        var fn = function(o) {
+            switch (o) {
+              case 1:
+                let e = o + 1
+                let c = o + 4;
+                console.log(e, c);
+                break;
+
+              case 2:
+                let l = o + 2;
+                console.log(l);
+                break;
+
+              default:
+                let a = o + 3;
+                console.log(a);
+            }
+        };
+    }
+}

test/compress/booleans.js

@@ -1,155 +0,0 @@
-iife_boolean_context: {
-    options = {
-        booleans: true,
-        evaluate: true,
-    }
-    input: {
-        console.log(function() {
-            return Object(1) || false;
-        }() ? "PASS" : "FAIL");
-        console.log(function() {
-            return [].length || true;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function() {
-            return Object(1);
-        }() ? "PASS" : "FAIL");
-        console.log(function() {
-            return [].length, 1;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: [
-        "PASS",
-        "PASS",
-    ]
-    expect_warnings: [
-        "WARN: Dropping side-effect-free || [test/compress/booleans.js:2,19]",
-        "WARN: Boolean || always true [test/compress/booleans.js:5,19]",
-    ]
-}
-
-issue_3465_1: {
-    options = {
-        booleans: true,
-    }
-    input: {
-        console.log(function(a) {
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function(a) {
-            return 1;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3465_2: {
-    options = {
-        booleans: true,
-    }
-    input: {
-        console.log(function f(a) {
-            if (!a) console.log(f(42));
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function f(a) {
-            if (!a) console.log(f(42));
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: [
-        "number",
-        "PASS",
-    ]
-}
-
-issue_3465_3: {
-    options = {
-        booleans: true,
-        passes: 2,
-        unused: true,
-    }
-    input: {
-        console.log(function f(a) {
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function(a) {
-            return 1;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: "PASS"
-}
-
-issue_2737_2: {
-    options = {
-        booleans: true,
-        inline: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function(bar) {
-            for (;bar();) break;
-        })(function qux() {
-            return console.log("PASS"), qux;
-        });
-    }
-    expect: {
-        (function(bar) {
-            for (;bar();) break;
-        })(function() {
-            return console.log("PASS"), 1;
-        });
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3658: {
-    options = {
-        booleans: true,
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function f() {
-            console || f();
-            return "PASS";
-        }());
-    }
-    expect: {
-        console.log(function f() {
-            console || f();
-            return "PASS";
-        }());
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3690: {
-    options = {
-        booleans: true,
-        unused: true,
-    }
-    input: {
-        console.log(function(a) {
-            return function() {
-                return a = [ this ];
-            }() ? "PASS" : "FAIL";
-        }());
-    }
-    expect: {
-        console.log(function(a) {
-            return function() {
-                return 1;
-            }() ? "PASS" : "FAIL";
-        }());
-    }
-    expect_stdout: "PASS"
-}

test/compress/comparing.js

@@ -0,0 +1,76 @@
+keep_comparisons: {
+    options = {
+        comparisons: true,
+        unsafe_comps: false
+    }
+    input: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj1 <= obj2;
+        var result2 = obj1 <  obj2;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+    expect: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj1 <= obj2;
+        var result2 = obj1 <  obj2;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+}
+
+keep_comparisons_with_unsafe_comps: {
+    options = {
+        comparisons: true,
+        unsafe_comps: true
+    }
+    input: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj1 <= obj2;
+        var result2 = obj1 <  obj2;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+    expect: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj2 >= obj1;
+        var result2 = obj2 >  obj1;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+}
+
+dont_change_in_or_instanceof_expressions: {
+    input: {
+        1 in 1;
+        null in null;
+        1 instanceof 1;
+        null instanceof null;
+    }
+    expect: {
+        1 in 1;
+        null in null;
+        1 instanceof 1;
+        null instanceof null;
+    }
+}

test/compress/comparisons.js

@@ -1,442 +0,0 @@
-comparisons: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        var obj1, obj2;
-        var result1 = obj1 <= obj2;
-        var result2 = obj1 <  obj2;
-        var result3 = obj1 >= obj2;
-        var result4 = obj1 >  obj2;
-    }
-    expect: {
-        var obj1, obj2;
-        var result1 = obj1 <= obj2;
-        var result2 = obj1 <  obj2;
-        var result3 = obj2 <= obj1;
-        var result4 = obj2 <  obj1;
-    }
-}
-
-unsafe_comps: {
-    options = {
-        comparisons: true,
-        conditionals: true,
-        unsafe_comps: true,
-    }
-    input: {
-        var obj1, obj2;
-        obj1 <= obj2 ? f1() : g1();
-        obj1 <  obj2 ? f2() : g2();
-        obj1 >= obj2 ? f3() : g3();
-        obj1 >  obj2 ? f4() : g4();
-    }
-    expect: {
-        var obj1, obj2;
-        (obj2 <  obj1 ? g1 : f1)();
-        (obj1 <  obj2 ? f2 : g2)();
-        (obj1 <  obj2 ? g3 : f3)();
-        (obj2 <  obj1 ? f4 : g4)();
-    }
-}
-
-dont_change_in_or_instanceof_expressions: {
-    input: {
-        1 in 1;
-        null in null;
-        1 instanceof 1;
-        null instanceof null;
-    }
-    expect: {
-        1 in 1;
-        null in null;
-        1 instanceof 1;
-        null instanceof null;
-    }
-}
-
-self_comparison_1: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        a === a;
-        a !== b;
-        b.c === a.c;
-        b.c !== b.c;
-    }
-    expect: {
-        a == a;
-        a !== b;
-        b.c === a.c;
-        b.c != b.c;
-    }
-}
-
-self_comparison_2: {
-    options = {
-        comparisons: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-    }
-    input: {
-        function f() {}
-        var o = {};
-        console.log(f != f, o === o);
-    }
-    expect: {
-        function f() {}
-        var o = {};
-        console.log(false, true);
-    }
-    expect_stdout: "false true"
-}
-
-issue_2857_1: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f1(a) {
-            a === undefined || a === null;
-            a === undefined || a !== null;
-            a !== undefined || a === null;
-            a !== undefined || a !== null;
-            a === undefined && a === null;
-            a === undefined && a !== null;
-            a !== undefined && a === null;
-            a !== undefined && a !== null;
-        }
-        function f2(a) {
-            a === null || a === undefined;
-            a === null || a !== undefined;
-            a !== null || a === undefined;
-            a !== null || a !== undefined;
-            a === null && a === undefined;
-            a === null && a !== undefined;
-            a !== null && a === undefined;
-            a !== null && a !== undefined;
-        }
-    }
-    expect: {
-        function f1(a) {
-            null == a;
-            void 0 === a || null !== a;
-            void 0 !== a || null === a;
-            void 0 !== a || null !== a;
-            void 0 === a && null === a;
-            void 0 === a && null !== a;
-            void 0 !== a && null === a;
-            null != a;
-        }
-        function f2(a) {
-            null == a;
-            null === a || void 0 !== a;
-            null !== a || void 0 === a;
-            null !== a || void 0 !== a;
-            null === a && void 0 === a;
-            null === a && void 0 !== a;
-            null !== a && void 0 === a;
-            null != a;
-        }
-    }
-}
-
-issue_2857_2: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            a === undefined || a === null || p;
-            a === undefined || a !== null || p;
-            a !== undefined || a === null || p;
-            a !== undefined || a !== null || p;
-            a === undefined && a === null || p;
-            a === undefined && a !== null || p;
-            a !== undefined && a === null || p;
-            a !== undefined && a !== null || p;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            null == a || p;
-            void 0 === a || null !== a || p;
-            void 0 !== a || null === a || p;
-            void 0 !== a || null !== a || p;
-            void 0 === a && null === a || p;
-            void 0 === a && null !== a || p;
-            void 0 !== a && null === a || p;
-            null != a || p;
-        }
-    }
-}
-
-issue_2857_3: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            a === undefined || a === null && p;
-            a === undefined || a !== null && p;
-            a !== undefined || a === null && p;
-            a !== undefined || a !== null && p;
-            a === undefined && a === null && p;
-            a === undefined && a !== null && p;
-            a !== undefined && a === null && p;
-            a !== undefined && a !== null && p;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            void 0 === a || null === a && p;
-            void 0 === a || null !== a && p;
-            void 0 !== a || null === a && p;
-            void 0 !== a || null !== a && p;
-            void 0 === a && null === a && p;
-            void 0 === a && null !== a && p;
-            void 0 !== a && null === a && p;
-            null != a && p;
-        }
-    }
-}
-
-issue_2857_4: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            p || a === undefined || a === null;
-            p || a === undefined || a !== null;
-            p || a !== undefined || a === null;
-            p || a !== undefined || a !== null;
-            p || a === undefined && a === null;
-            p || a === undefined && a !== null;
-            p || a !== undefined && a === null;
-            p || a !== undefined && a !== null;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            p || null == a;
-            p || void 0 === a || null !== a;
-            p || void 0 !== a || null === a;
-            p || void 0 !== a || null !== a;
-            p || void 0 === a && null === a;
-            p || void 0 === a && null !== a;
-            p || void 0 !== a && null === a;
-            p || null != a;
-        }
-    }
-}
-
-issue_2857_5: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            p && a === undefined || a === null;
-            p && a === undefined || a !== null;
-            p && a !== undefined || a === null;
-            p && a !== undefined || a !== null;
-            p && a === undefined && a === null;
-            p && a === undefined && a !== null;
-            p && a !== undefined && a === null;
-            p && a !== undefined && a !== null;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            p && void 0 === a || null === a;
-            p && void 0 === a || null !== a;
-            p && void 0 !== a || null === a;
-            p && void 0 !== a || null !== a;
-            p && void 0 === a && null === a;
-            p && void 0 === a && null !== a;
-            p && void 0 !== a && null === a;
-            p && null != a;
-        }
-    }
-}
-
-issue_2857_6: {
-    options = {
-        comparisons: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-    }
-    input: {
-        function f(a) {
-            if (({}).b === undefined || {}.b === null)
-                return a.b !== undefined && a.b !== null;
-        }
-        console.log(f({
-            a: [ null ],
-            get b() {
-                return this.a.shift();
-            }
-        }));
-    }
-    expect: {
-        function f(a) {
-            if (null == {}.b)
-                return void 0 !== a.b && null !== a.b;
-        }
-        console.log(f({
-            a: [ null ],
-            get b() {
-                return this.a.shift();
-            }
-        }));
-    }
-    expect_stdout: "true"
-}
-
-is_boolean_unsafe: {
-    options = {
-        comparisons: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(/foo/.test("bar") === [].isPrototypeOf({}));
-    }
-    expect: {
-        console.log(/foo/.test("bar") == [].isPrototypeOf({}));
-    }
-    expect_stdout: "true"
-}
-
-is_number_unsafe: {
-    options = {
-        comparisons: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(Math.acos(42) !== "foo".charCodeAt(4));
-    }
-    expect: {
-        console.log(Math.acos(42) != "foo".charCodeAt(4));
-    }
-    expect_stdout: "true"
-}
-
-is_boolean_var: {
-    options = {
-        comparisons: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a, b) {
-            for (var i = 0, c = !b; i < a.length; i++)
-                if (!a[i] === c)
-                    return i;
-        }([ false, true ], 42));
-    }
-    expect: {
-        console.log(function(a, b) {
-            for (var i = 0, c = !b; i < a.length; i++)
-                if (!a[i] == c)
-                    return i;
-        }([ false, true ], 42));
-    }
-    expect_stdout: "1"
-}
-
-is_defined: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        console.log(function a() {
-            return void 0 === a;
-        }());
-    }
-    expect: {
-        console.log(function a() {
-            return a, false;
-        }());
-    }
-    expect_stdout: "false"
-    expect_warnings: [
-        "WARN: Expression always defined [test/compress/comparisons.js:2,19]",
-    ]
-}
-
-unsafe_indexOf: {
-    options = {
-        booleans: true,
-        comparisons: true,
-        unsafe: true,
-    }
-    input: {
-        var a = Object.keys({ foo: 42 });
-        if (a.indexOf("bar") < 0) console.log("PASS");
-        if (0 > a.indexOf("bar")) console.log("PASS");
-        if (a.indexOf("foo") >= 0) console.log("PASS");
-        if (0 <= a.indexOf("foo")) console.log("PASS");
-        if (a.indexOf("foo") > -1) console.log("PASS");
-        if (-1 < a.indexOf("foo")) console.log("PASS");
-        if (a.indexOf("bar") == -1) console.log("PASS");
-        if (-1 == a.indexOf("bar")) console.log("PASS");
-        if (a.indexOf("bar") === -1) console.log("PASS");
-        if (-1 === a.indexOf("bar")) console.log("PASS");
-        if (a.indexOf("foo") != -1) console.log("PASS");
-        if (-1 != a.indexOf("foo")) console.log("PASS");
-        if (a.indexOf("foo") !== -1) console.log("PASS");
-        if (-1 !== a.indexOf("foo")) console.log("PASS");
-    }
-    expect: {
-        var a = Object.keys({ foo: 42 });
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-    }
-    expect_stdout: [
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-    ]
-}
-
-issue_3413: {
-    options = {
-        comparisons: true,
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        var b;
-        void 0 !== ("" < b || void 0) || console.log("PASS");
-    }
-    expect: {
-        var b;
-        void 0 !== ("" < b || void 0) || console.log("PASS");
-    }
-    expect_stdout: "PASS"
-}

test/compress/concat-strings.js

@@ -1,7 +1,7 @@
 concat_1: {
     options = {
-        evaluate: true,
-    }
+        evaluate: true
+    };
     input: {
         var a = "foo" + "bar" + x() + "moo" + "foo" + y() + "x" + "y" + "z" + q();
         var b = "foo" + 1 + x() + 2 + "boo";
@@ -21,14 +21,12 @@ concat_1: {
         var c = 1 + x() + 2 + "boo";
         var d = 1 + x() + 2 + 3 + "boo";
         var e = 1 + x() + 2 + "X3boo";
-        var f = "\x00360\x008\0";
+        var f = "\x00360\08\0";
     }
 }
 
 concat_2: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             1 + (2 + 3),
@@ -57,9 +55,7 @@ concat_2: {
 }
 
 concat_3: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             1 + 2 + (3 + 4 + 5),
@@ -88,9 +84,7 @@ concat_3: {
 }
 
 concat_4: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             1 + "2" + (3 + 4 + 5),
@@ -119,9 +113,7 @@ concat_4: {
 }
 
 concat_5: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             "1" + 2 + (3 + 4 + 5),
@@ -150,9 +142,7 @@ concat_5: {
 }
 
 concat_6: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             "1" + "2" + (3 + 4 + 5),
@@ -181,9 +171,6 @@ concat_6: {
 }
 
 concat_7: {
-    options = {
-        strings: true,
-    }
     input: {
         console.log(
             "" + 1,
@@ -210,9 +197,6 @@ concat_7: {
 }
 
 concat_8: {
-    options = {
-        strings: true,
-    }
     input: {
         console.log(
             1 + "",
@@ -237,20 +221,3 @@ concat_8: {
     }
     expect_stdout: true
 }
-
-issue_3689: {
-    options = {
-        strings: true,
-    }
-    input: {
-        console.log(function(a) {
-            return a + ("" + (a[0] = 0));
-        }([]));
-    }
-    expect: {
-        console.log(function(a) {
-            return a + ("" + (a[0] = 0));
-        }([]));
-    }
-    expect_stdout: "00"
-}

test/compress/conditionals.js

@@ -1,7 +1,7 @@
 ifs_1: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (foo) bar();
         if (!foo); else bar();
@@ -18,8 +18,8 @@ ifs_1: {
 
 ifs_2: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (foo) {
             x();
@@ -41,18 +41,18 @@ ifs_2: {
     }
     expect: {
         foo ? x() : bar ? y() : baz && z();
-        (foo ? x : bar ? y : baz ? z : t)();
+        foo ? x() : bar ? y() : baz ? z() : t();
     }
 }
 
 ifs_3_should_warn: {
     options = {
-        booleans: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-    }
+        conditionals : true,
+        dead_code    : true,
+        evaluate     : true,
+        booleans     : true,
+        side_effects : true,
+    };
     input: {
         var x, y;
         if (x && !(x + "1") && y) { // 1
@@ -78,8 +78,8 @@ ifs_3_should_warn: {
 
 ifs_4: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (foo && bar) {
             x(foo)[10].bar.baz = something();
@@ -95,10 +95,10 @@ ifs_4: {
 
 ifs_5: {
     options = {
-        comparisons: true,
-        conditionals: true,
         if_return: true,
-    }
+        conditionals: true,
+        comparisons: true,
+    };
     input: {
         function f() {
             if (foo) return;
@@ -132,9 +132,9 @@ ifs_5: {
 
 ifs_6: {
     options = {
-        comparisons: true,
         conditionals: true,
-    }
+        comparisons: true
+    };
     input: {
         var x, y;
         if (!foo && !bar && !baz && !boo) {
@@ -161,74 +161,52 @@ ifs_6: {
     }
 }
 
-ifs_7: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        if (A); else;
-        if (A) while (B); else;
-        if (A); else while (C);
-        if (A) while (B); else while (C);
-    }
-    expect: {
-        A;
-        if (A) while (B);
-        if (!A) while (C);
-        if (A) while (B); else while (C);
-    }
-}
-
 cond_1: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
-        function foo(do_something, some_condition) {
-            if (some_condition) {
-                do_something(x);
-            } else {
-                do_something(y);
-            }
-            if (some_condition) {
-                side_effects(x);
-            } else {
-                side_effects(y);
-            }
+        var do_something; // if undeclared it's assumed to have side-effects
+        if (some_condition()) {
+            do_something(x);
+        } else {
+            do_something(y);
+        }
+        if (some_condition()) {
+            side_effects(x);
+        } else {
+            side_effects(y);
         }
     }
     expect: {
-        function foo(do_something, some_condition) {
-            do_something(some_condition ? x : y);
-            some_condition ? side_effects(x) : side_effects(y);
-        }
+        var do_something;
+        do_something(some_condition() ? x : y);
+        some_condition() ? side_effects(x) : side_effects(y);
     }
 }
 
 cond_2: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
-        function foo(x, FooBar, some_condition) {
-            if (some_condition) {
-                x = new FooBar(1);
-            } else {
-                x = new FooBar(2);
-            }
+        var x, FooBar;
+        if (some_condition()) {
+            x = new FooBar(1);
+        } else {
+            x = new FooBar(2);
         }
     }
     expect: {
-        function foo(x, FooBar, some_condition) {
-            x = new FooBar(some_condition ? 1 : 2);
-        }
+        var x, FooBar;
+        x = new FooBar(some_condition() ? 1 : 2);
     }
 }
 
 cond_3: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         var FooBar;
         if (some_condition()) {
@@ -245,8 +223,8 @@ cond_3: {
 
 cond_4: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         var do_something;
         if (some_condition()) {
@@ -269,8 +247,8 @@ cond_4: {
 
 cond_5: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (some_condition()) {
             if (some_other_condition()) {
@@ -289,56 +267,17 @@ cond_5: {
         }
     }
     expect: {
-        (some_condition() && some_other_condition() ? do_something : alternate)();
+        some_condition() && some_other_condition() ? do_something() : alternate();
         some_condition() && some_other_condition() && do_something();
     }
 }
 
-cond_6: {
-    options = {
-        booleans: true,
-        conditionals: true,
-    }
-    input: {
-        x ? a : b;
-        x ? a : a;
-
-        x ? y ? a : b : c;
-        x ? y ? a : a : b;
-        x ? y ? a : b : b;
-        x ? y ? a : b : a;
-        x ? y ? a : a : a;
-
-        x ? a : y ? b : c;
-        x ? a : y ? a : b;
-        x ? a : y ? b : b;
-        x ? a : y ? b : a;
-        x ? a : y ? a : a;
-    }
-    expect: {
-        x ? a : b;
-        x, a;
-
-        x ? y ? a : b : c;
-        x ? (y, a) : b;
-        x && y ? a : b;
-        !x || y ? a : b;
-        x && y, a;
-
-        x ? a : y ? b : c;
-        x || y ? a : b;
-        x ? a : (y, b);
-        !x && y ? b : a;
-        !x && y, a;
-    }
-}
-
 cond_7: {
     options = {
         conditionals: true,
-        evaluate: true,
+        evaluate    : true,
         side_effects: true,
-    }
+    };
     input: {
         var x, y, z, a, b;
         // compress these
@@ -389,7 +328,7 @@ cond_7: {
         x = 'foo';
         x = 'foo';
         x = (condition(), 20);
-        x = (z || condition(), 'fuji');
+        x = z ? 'fuji' : (condition(), 'fuji');
         x = (condition(), 'foobar');
         x = y ? a : b;
         x = y ? 'foo' : 'fo';
@@ -399,8 +338,8 @@ cond_7: {
 cond_7_1: {
     options = {
         conditionals: true,
-        evaluate: true,
-    }
+        evaluate    : true
+    };
     input: {
         var x;
         // access to global should be assumed to have side effects
@@ -418,10 +357,10 @@ cond_7_1: {
 
 cond_8: {
     options = {
-        booleans: false,
         conditionals: true,
-        evaluate: true,
-    }
+        evaluate    : true,
+        booleans    : false
+    };
     input: {
         var a;
         // compress these
@@ -502,10 +441,10 @@ cond_8: {
 
 cond_8b: {
     options = {
-        booleans: true,
         conditionals: true,
-        evaluate: true,
-    }
+        evaluate    : true,
+        booleans    : true
+    };
     input: {
         var a;
         // compress these
@@ -585,10 +524,10 @@ cond_8b: {
 
 cond_8c: {
     options = {
-        booleans: false,
         conditionals: true,
-        evaluate: false,
-    }
+        evaluate    : false,
+        booleans    : false
+    };
     input: {
         var a;
         // compress these
@@ -666,140 +605,11 @@ cond_8c: {
     }
 }
 
-cond_9: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        function f(x, y) {
-            g() ? x(1) : x(2);
-            x ? (y || x)() : (y || x)();
-            x ? y(a, b) : y(d, b, c);
-            x ? y(a, b, c) : y(a, b, c);
-            x ? y(a, b, c) : y(a, b, f);
-            x ? y(a, b, c) : y(a, e, c);
-            x ? y(a, b, c) : y(a, e, f);
-            x ? y(a, b, c) : y(d, b, c);
-            x ? y(a, b, c) : y(d, b, f);
-            x ? y(a, b, c) : y(d, e, c);
-            x ? y(a, b, c) : y(d, e, f);
-        }
-    }
-    expect: {
-        function f(x, y) {
-            g() ? x(1) : x(2);
-            x, (y || x)();
-            x ? y(a, b) : y(d, b, c);
-            x, y(a, b, c);
-            y(a, b, x ? c : f);
-            y(a, x ? b : e, c);
-            x ? y(a, b, c) : y(a, e, f);
-            y(x ? a : d, b, c);
-            x ? y(a, b, c) : y(d, b, f);
-            x ? y(a, b, c) : y(d, e, c);
-            x ? y(a, b, c) : y(d, e, f);
-        }
-    }
-}
-
-cond_10: {
-    options = {
-        conditionals: true,
-        if_return: true,
-    }
-    input: {
-        function f(a) {
-            if (1 == a) return "foo";
-            if (2 == a) return "foo";
-            if (3 == a) return "foo";
-            if (4 == a) return 42;
-            if (5 == a) return "foo";
-            if (6 == a) return "foo";
-            return "bar";
-        }
-        console.log(f(1), f(2), f(3), f(4), f(5), f(6), f(7));
-    }
-    expect: {
-        function f(a) {
-            return 1 == a || 2 == a || 3 == a ? "foo" : 4 == a ? 42 : 5 == a || 6 == a ? "foo" : "bar";
-        }
-        console.log(f(1), f(2), f(3), f(4), f(5), f(6), f(7));
-    }
-    expect_stdout: "foo foo foo 42 foo foo bar"
-}
-
-cond_11: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        var o = {
-            p: "foo",
-            q: function() {
-                return this.p;
-            }
-        };
-        function f() {
-            return "bar";
-        }
-        function g(a) {
-            return a ? f() : o.q();
-        }
-        console.log(g(0), g(1));
-    }
-    expect: {
-        var o = {
-            p: "foo",
-            q: function() {
-                return this.p;
-            }
-        };
-        function f() {
-            return "bar";
-        }
-        function g(a) {
-            return a ? f() : o.q();
-        }
-        console.log(g(0), g(1));
-    }
-    expect_stdout: "foo bar"
-}
-
-cond_12: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        x ? y && a : a;
-        x ? y || a : a;
-        x ? a : y && a;
-        x ? a : y || a;
-    }
-    expect: {
-        (!x || y) && a;
-        x && y || a;
-        (x || y) && a;
-        !x && y || a;
-    }
-}
-
 ternary_boolean_consequent: {
     options = {
-        booleans: true,
-        collapse_vars: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        properties: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
+        comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
+        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? true : x; }
@@ -825,21 +635,9 @@ ternary_boolean_consequent: {
 
 ternary_boolean_alternative: {
     options = {
-        booleans: true,
-        collapse_vars: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        properties: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
+        comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
+        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? x : true; }
@@ -865,11 +663,10 @@ ternary_boolean_alternative: {
 
 trivial_boolean_ternary_expressions : {
     options = {
-        booleans: true,
         conditionals: true,
-        evaluate: true,
-        side_effects: true,
-    }
+        evaluate    : true,
+        booleans    : true
+    };
     input: {
         f('foo' in m ? true  : false);
         f('foo' in m ? false : true);
@@ -940,11 +737,11 @@ trivial_boolean_ternary_expressions : {
 
 issue_1154: {
     options = {
-        booleans: true,
         conditionals: true,
-        evaluate: true,
+        evaluate    : true,
+        booleans    : true,
         side_effects: true,
-    }
+    };
     input: {
         function f1(x) { return x ? -1 : -1; }
         function f2(x) { return x ? +2 : +2; }
@@ -980,7 +777,7 @@ issue_1154: {
 no_evaluate: {
     options = {
         conditionals: true,
-        evaluate: false,
+        evaluate    : false,
         side_effects: true,
     }
     input: {
@@ -1218,451 +1015,3 @@ delete_conditional_2: {
     }
     expect_stdout: true
 }
-
-issue_2535_1: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        evaluate: true,
-        passes: 2,
-        side_effects: true,
-    }
-    input: {
-        if (true || x()) y();
-        if (true && x()) y();
-        if (x() || true) y();
-        if (x() && true) y();
-        if (false || x()) y();
-        if (false && x()) y();
-        if (x() || false) y();
-        if (x() && false) y();
-    }
-    expect: {
-        y();
-        x() && y();
-        x(), y();
-        x() && y();
-        x() && y();
-        x() && y();
-        x();
-    }
-}
-
-issue_2535_2: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        function x() {}
-        function y() {
-            return "foo";
-        }
-        console.log((x() || true) || y());
-        console.log((y() || true) || x());
-        console.log((x() || true) && y());
-        console.log((y() || true) && x());
-        console.log((x() && true) || y());
-        console.log((y() && true) || x());
-        console.log((x() && true) && y());
-        console.log((y() && true) && x());
-        console.log((x() || false) || y());
-        console.log((y() || false) || x());
-        console.log((x() || false) && y());
-        console.log((y() || false) && x());
-        console.log((x() && false) || y());
-        console.log((y() && false) || x());
-        console.log((x() && false) && y());
-        console.log((y() && false) && x());
-    }
-    expect: {
-        function x() {}
-        function y() {
-            return "foo";
-        }
-        console.log(x() || !0);
-        console.log(y() || !0);
-        console.log((x(), y()));
-        console.log((y(), x()));
-        console.log(!!x() || y());
-        console.log(!!y() || x());
-        console.log(x() && y());
-        console.log(y() && x());
-        console.log(x() || y());
-        console.log(y() || x());
-        console.log(!!x() && y());
-        console.log(!!y() && x());
-        console.log((x(), y()));
-        console.log((y(), x()));
-        console.log(x() && !1);
-        console.log(y() && !1);
-    }
-    expect_stdout: [
-        "true",
-        "foo",
-        "foo",
-        "undefined",
-        "foo",
-        "true",
-        "undefined",
-        "undefined",
-        "foo",
-        "foo",
-        "false",
-        "undefined",
-        "foo",
-        "undefined",
-        "undefined",
-        "false",
-    ]
-}
-
-issue_2560: {
-    options = {
-        conditionals: true,
-        inline: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function log(x) {
-            console.log(x);
-        }
-        function foo() {
-            return log;
-        }
-        function bar() {
-            if (x !== (x = foo())) {
-                x(1);
-            } else {
-                x(2);
-            }
-        }
-        var x = function() {
-            console.log("init");
-        };
-        bar();
-        bar();
-    }
-    expect: {
-        function log(x) {
-            console.log(x);
-        }
-        function bar() {
-            x !== (x = log) ? x(1) : x(2);
-        }
-        var x = function() {
-            console.log("init");
-        };
-        bar();
-        bar();
-    }
-    expect_stdout: [
-        "1",
-        "2",
-    ]
-}
-
-hoist_decl: {
-    options = {
-        conditionals: true,
-        join_vars: true,
-        sequences: true,
-    }
-    input: {
-        if (x()) {
-            var a;
-            y();
-        } else {
-            z();
-            var b;
-        }
-    }
-    expect: {
-        var a, b;
-        x() ? y() : z();
-    }
-}
-
-to_and_or: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        var values = [
-            0,
-            null,
-            true,
-            "foo",
-            false,
-            -1 / 0,
-            void 0,
-        ];
-        values.forEach(function(x) {
-            values.forEach(function(y) {
-                values.forEach(function(z) {
-                    console.log(x ? y || z : z);
-                });
-            });
-        });
-    }
-    expect: {
-        var values = [
-            0,
-            null,
-            true,
-            "foo",
-            false,
-            -1 / 0,
-            void 0,
-        ];
-        values.forEach(function(x) {
-            values.forEach(function(y) {
-                values.forEach(function(z) {
-                    console.log(x && y || z);
-                });
-            });
-        });
-    }
-    expect_stdout: true
-}
-
-cond_seq_assign_1: {
-    options = {
-        conditionals: true,
-        sequences: true,
-    }
-    input: {
-        function f(a) {
-            var t;
-            if (a) {
-                t = "foo";
-                t = "bar";
-            } else {
-                console.log(t);
-                t = 42;
-            }
-            console.log(t);
-        }
-        f(f);
-        f();
-    }
-    expect: {
-        function f(a) {
-            var t;
-            t = a ? (t = "foo", "bar") : (console.log(t), 42),
-            console.log(t);
-        }
-        f(f),
-        f();
-    }
-    expect_stdout: [
-        "bar",
-        "undefined",
-        "42",
-    ]
-}
-
-cond_seq_assign_2: {
-    options = {
-        conditionals: true,
-        sequences: true,
-    }
-    input: {
-        function f(a) {
-            var t;
-            if (a) {
-                t = "foo";
-                a = "bar";
-            } else {
-                console.log(t);
-                t = 42;
-            }
-            console.log(t);
-        }
-        f(f);
-        f();
-    }
-    expect: {
-        function f(a) {
-            var t;
-            a ? (t = "foo", a = "bar") : (console.log(t), t = 42),
-            console.log(t);
-        }
-        f(f),
-        f();
-    }
-    expect_stdout: [
-        "foo",
-        "undefined",
-        "42",
-    ]
-}
-
-cond_seq_assign_3: {
-    options = {
-        assignments: true,
-        conditionals: true,
-    }
-    input: {
-        var c = 0;
-        if (this)
-            c = 1 + c, c = c + 1;
-        else
-            c = 1 + c, c = c + 1;
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        this, c = 1 + c, c += 1;
-        console.log(c);
-    }
-    expect_stdout: "2"
-}
-
-issue_3271: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        function f(a) {
-            var i = 0, b = [];
-            if (a) {
-                b[i++] = 4,
-                b[i++] = 1;
-            } else {
-                b[i++] = 3,
-                b[i++] = 2,
-                b[i++] = 1;
-            }
-            return b;
-        }
-        console.log(f(0).pop(), f(1).pop());
-    }
-    expect: {
-        function f(a) {
-            var i = 0, b = [];
-            a ? b[i++] = 4 : (b[i++] = 3, b[i++] = 2),
-            b[i++] = 1;
-            return b;
-        }
-        console.log(f(0).pop(), f(1).pop());
-    }
-    expect_stdout: "1 1"
-}
-
-iife_condition: {
-    options = {
-        conditionals: true,
-        side_effects: true,
-    }
-    input: {
-        if (function() {
-            return console;
-        }())
-            console.log("PASS");
-    }
-    expect: {
-        !function() {
-            return console;
-        }() || console.log("PASS");
-    }
-    expect_stdout: "PASS"
-}
-
-angularjs_chain: {
-    options = {
-        conditionals: true,
-        passes: 2,
-        side_effects: true,
-    }
-    input: {
-        function nonComputedMember(left, right, context, create) {
-            var lhs = left();
-            if (create && create !== 1) {
-                if (lhs && lhs[right] == null) {
-                    lhs[right] = {};
-                }
-            }
-            var value = lhs != null ? lhs[right] : undefined;
-            if (context) {
-                return { context: lhs, name: right, value: value };
-            } else {
-                return value;
-            }
-        }
-    }
-    expect: {
-        function nonComputedMember(left, right, context, create) {
-            var lhs = left();
-            create && 1 !== create && lhs && null == lhs[right] && (lhs[right] = {});
-            var value = null != lhs ? lhs[right] : void 0;
-            return context ? {
-                context: lhs,
-                name: right,
-                value: value
-            } : value;
-        }
-    }
-}
-
-issue_3576: {
-    options = {
-        conditionals: true,
-        evaluate: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-    }
-    input: {
-        var c = "FAIL";
-        (function(a) {
-            (a = -1) ? (a && (a.a = 0)) : (a && (a.a = 0));
-            a && a[c = "PASS"]++;
-        })();
-        console.log(c);
-    }
-    expect: {
-        var c = "FAIL";
-        (function(a) {
-            a = -1, a, a.a = 0;
-            a, a[c = "PASS"]++;
-        })();
-        console.log(c);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3668: {
-    options = {
-        conditionals: true,
-        if_return: true,
-    }
-    input: {
-        function f() {
-            try {
-                var undefined = typeof f;
-                if (!f) return undefined;
-                return;
-            } catch (e) {
-                return "FAIL";
-            }
-        }
-        console.log(f());
-    }
-    expect: {
-        function f() {
-            try {
-                var undefined = typeof f;
-                return f ? void 0 : undefined;
-            } catch (e) {
-                return "FAIL";
-            }
-        }
-        console.log(f());
-    }
-    expect_stdout: "undefined"
-}

test/compress/const.js

@@ -0,0 +1,166 @@
+issue_1191: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        function foo(rot) {
+            const rotTol = 5;
+            if (rot < -rotTol || rot > rotTol)
+                bar();
+            baz();
+        }
+    }
+    expect: {
+        function foo(rot) {
+            (rot < -5 || rot > 5) && bar();
+            baz();
+        }
+    }
+}
+
+issue_1194: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        function f1() {const a = "X"; return a + a;}
+        function f2() {const aa = "X"; return aa + aa;}
+        function f3() {const aaa = "X"; return aaa + aaa;}
+    }
+    expect: {
+        function f1(){return"XX"}
+        function f2(){return"XX"}
+        function f3(){return"XX"}
+    }
+}
+
+issue_1396: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        function foo(a) {
+            const VALUE = 1;
+            console.log(2 | VALUE);
+            console.log(VALUE + 1);
+            console.log(VALUE);
+            console.log(a & VALUE);
+        }
+        function bar() {
+            const s = "01234567890123456789";
+            console.log(s + s + s + s + s);
+
+            const CONSTANT = "abc";
+            console.log(CONSTANT + CONSTANT + CONSTANT + CONSTANT + CONSTANT);
+        }
+    }
+    expect: {
+        function foo(a) {
+            console.log(3);
+            console.log(2);
+            console.log(1);
+            console.log(1 & a);
+        }
+        function bar() {
+            const s = "01234567890123456789";
+            console.log(s + s + s + s + s);
+
+            console.log("abcabcabcabcabc");
+        }
+    }
+}
+
+unused_regexp_literal: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+    }
+    input: {
+        function f(){ var a = /b/; }
+    }
+    expect: {
+        function f(){}
+    }
+}
+
+regexp_literal_not_const: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        (function(){
+            var result;
+            const s = 'acdabcdeabbb';
+            const REGEXP_LITERAL = /ab*/g;
+            while (result = REGEXP_LITERAL.exec(s)) {
+                console.log(result[0]);
+            }
+        })();
+    }
+    expect: {
+        (function() {
+            var result;
+            const REGEXP_LITERAL = /ab*/g;
+            while (result = REGEXP_LITERAL.exec("acdabcdeabbb")) console.log(result[0]);
+        })();
+    }
+    expect_stdout: true
+}

test/compress/debugger.js

@@ -1,7 +1,7 @@
 keep_debugger: {
     options = {
-        drop_debugger: false,
-    }
+        drop_debugger: false
+    };
     input: {
         debugger;
     }
@@ -12,8 +12,8 @@ keep_debugger: {
 
 drop_debugger: {
     options = {
-        drop_debugger: true,
-    }
+        drop_debugger: true
+    };
     input: {
         debugger;
         if (foo) debugger;

test/compress/destructuring.js

@@ -0,0 +1,332 @@
+destructuring_arrays: {
+    input: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz,] = xx; // Trailing comma
+        var [,,zzz,,] = xxx; // Trailing comma after hole
+    }
+    expect: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz] = xx;
+        var [,,zzz,,] = xxx;
+    }
+}
+
+destructuring_arrays_holes: {
+    input: {
+        var [,,,,] = a;
+        var [,,b,] = c;
+        var [d,,]  = e;
+    }
+    expect_exact: "var[,,,,]=a;var[,,b]=c;var[d,,]=e;"
+}
+
+destructuring_objects: {
+    input: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+    expect: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+}
+
+destructuring_objects_trailing_elision: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        var {cc,} = foo;
+    }
+    expect_exact: "var{cc}=foo;"
+}
+
+nested_destructuring_objects: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+    }
+    expect_exact: 'const[{a},b]=c;let[{a},b]=c;var[{a},b]=c;';
+}
+
+destructuring_constdef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (const [x,y] in pairs);
+        for (const [a] = 0;;);
+        for (const {c} of cees);
+    }
+    expect_exact: "for(const[x,y]in pairs);for(const[a]=0;;);for(const{c}of cees);"
+}
+
+destructuring_letdef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (let [x,y] in pairs);
+        for (let [a] = 0;;);
+        for (let {c} of cees);
+    }
+    expect_exact: "for(let[x,y]in pairs);for(let[a]=0;;);for(let{c}of cees);"
+}
+
+destructuring_vardef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (var [x,y] in pairs);
+        for (var [a] = 0;;);
+        for (var {c} of cees);
+    }
+    expect_exact: "for(var[x,y]in pairs);for(var[a]=0;;);for(var{c}of cees);"
+}
+
+destructuring_expressions: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b});
+        [{a}];
+        f({x});
+    }
+    expect_exact: "({a,b});[{a}];f({x});"
+}
+
+destructuring_remove_unused_1: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var unused = "foo";
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var unused = "foo";
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var unused = "foo";
+            var a = [1, 2, 3, 4, 5];
+            var x = [[1, 2, 3]];
+            var y = {h: 1};
+            var [b, ...c] = a;
+            var [...[e, f]] = x;
+            var [...{g: h}] = y;
+            f(b, c, e, f, g);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var a = [1, 2, 3, 4, 5];
+            var x = [[1, 2, 3]];
+            var y = {h: 1};
+            var [b, ...c] = a;
+            var [...[e, f]] = x;
+            var [...{g: h}] = y;
+            f(b, c, e, f, g);
+        }
+    }
+}
+
+destructuring_remove_unused_2: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+}
+
+object_destructuring_may_need_parentheses: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b} = {a: 1, b: 2});
+    }
+    expect_exact: "({a,b}={a:1,b:2});"
+}
+
+destructuring_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        [foo = undefined] = bar;
+        [foo = void 0] = bar;
+    }
+    expect: {
+        [foo] = bar;
+        [foo] = bar;
+    }
+}
+
+destructuring_dont_evaluate_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: false
+    }
+    input: {
+        [foo = undefined] = bar;
+    }
+    expect: {
+        [foo = void 0] = bar;
+    }
+}
+
+reduce_vars: {
+    options = {
+        reduce_vars: true,
+    }
+    input: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+    expect: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+}
+
+unused: {
+    options = {
+        unused: true,
+    }
+    input: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+    expect: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+}
+
+issue_1886: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        let [a] = [1];
+        console.log(a);
+    }
+    expect: {
+        let [a] = [1];
+        console.log(a);
+    }
+    expect_exact: "1"
+}

test/compress/directives.js

@@ -1,133 +1,10 @@
-simple_statement_is_not_a_directive: {
+class_directives_compression: {
     input: {
-        "use strict"
-            .split(" ")
-            .forEach(function(s) {
-                console.log(s);
-            });
-        console.log(!this); // is strict mode?
-        (function() {
-            "directive"
-            ""
-            "use strict"
-            "hello world"
-                .split(" ")
-                .forEach(function(s) {
-                    console.log(s);
-                });
-            console.log(!this); // is strict mode?
-        })();
-    }
-    expect: {
-        "use strict".split(" ").forEach(function(s) {
-            console.log(s);
-        });
-        console.log(!this);
-        (function() {
-            "directive";
-            "";
-            "use strict";
-            "hello world".split(" ").forEach(function(s) {
-                console.log(s);
-            });
-            console.log(!this);
-        })();
-    }
-    expect_stdout: [
-        "use",
-        "strict",
-        "false",
-        "hello",
-        "world",
-        "true",
-    ]
-}
-
-drop_lone_use_strict: {
-    options = {
-        directives: true,
-        side_effects: true,
-    }
-    input: {
-        function f1() {
-            "use strict";
-        }
-        function f2() {
-            "use strict";
-            function f3() {
+        class foo {
+            foo() {
                 "use strict";
             }
         }
-        (function f4() {
-            "use strict";
-        })();
-    }
-    expect: {
-        function f1() {
-        }
-        function f2() {
-            "use strict";
-            function f3() {
-            }
-        }
     }
-}
-
-issue_3166: {
-    options = {
-        directives: true,
-    }
-    input: {
-        "foo";
-        "use strict";
-        function f() {
-            "use strict";
-            "bar";
-            "use asm";
-        }
-    }
-    expect: {
-        "use strict";
-        function f() {
-            "use asm";
-        }
-    }
-}
-
-valid_after_invalid_1: {
-    input: {
-        console.log(typeof function() {
-            "use\x20strict";
-            "use strict";
-            return this;
-        }());
-    }
-    expect: {
-        console.log(typeof function() {
-            "use\x20strict";
-            "use strict";
-            return this;
-        }());
-    }
-    expect_stdout: "undefined"
-}
-
-valid_after_invalid_2: {
-    options = {
-        directives: true,
-    }
-    input: {
-        console.log(typeof function() {
-            "use\x20strict";
-            "use strict";
-            return this;
-        }());
-    }
-    expect: {
-        console.log(typeof function() {
-            "use strict";
-            return this;
-        }());
-    }
-    expect_stdout: "undefined"
+    expect_exact: "class foo{foo(){}}"
 }

test/compress/drop-console.js

@@ -1,5 +1,5 @@
 drop_console_1: {
-    options = {}
+    options = {};
     input: {
         console.log('foo');
         console.log.apply(console, arguments);
@@ -11,9 +11,7 @@ drop_console_1: {
 }
 
 drop_console_2: {
-    options = {
-        drop_console: true,
-    }
+    options = { drop_console: true };
     input: {
         console.log('foo');
         console.log.apply(console, arguments);

test/compress/expansions.js

@@ -0,0 +1,28 @@
+
+expand_arguments: {
+    input: {
+        func(a, ...rest);
+        func(...all);
+    }
+    expect_exact: "func(a,...rest);func(...all);"
+}
+
+expand_expression_arguments: {
+    input: {
+        f(...a.b);
+        f(...a.b());
+        f(...(a));
+        f(...(a.b));
+        f(...a[i]);
+    }
+    expect_exact: "f(...a.b);f(...a.b());f(...a);f(...a.b);f(...a[i]);"
+}
+
+expand_parameters: {
+    input: {
+        (function (a, ...b){});
+        (function (...args){});
+    }
+    expect_exact: "(function(a,...b){});(function(...args){});"
+}
+

test/compress/expression.js

@@ -0,0 +1,52 @@
+pow: {
+    input: {
+        var a = 2 ** 7;
+        var b = 3;
+        b **= 2;
+    }
+    expect: {
+        var a = 2 ** 7;
+        var b = 3;
+        b **= 2;
+    }
+}
+
+pow_with_number_constants: {
+    input: {
+        var a = 5 ** NaN;
+        var b = 42 ** +0;
+        var c = 42 ** -0;
+        var d = NaN ** 1;
+        var e = 2 ** Infinity;
+        var f = 2 ** -Infinity;
+    }
+    expect: {
+        var a = 5 ** NaN;
+        var b = 42 ** +0;
+        var c = 42 ** -0;
+        var d = NaN ** 1;
+        var e = 2 ** (1/0);
+        var f = 2 ** (-1/0);
+    }
+}
+
+pow_with_parentheses: {
+    input: {
+        var g = (-7) ** (0.5);
+        var h = 2324334 ** 34343443;
+        var i = (-2324334) ** 34343443;
+        var j = 2 ** (-3);
+        var k = 2.0 ** -3;
+        var l = 2.0 ** (5 - 7);
+    }
+    expect_exact: "var g=(-7)**.5;var h=2324334**34343443;var i=(-2324334)**34343443;var j=2**-3;var k=2**-3;var l=2**(5-7);"
+}
+
+pow_with_unary_between_brackets: {
+    input: {
+        var a = (-(+5)) ** 3;
+    }
+    expect: {
+        var a = (-+5)**3;
+    }
+}

test/compress/global_defs.js

@@ -2,7 +2,7 @@ must_replace: {
     options = {
         global_defs: {
             D: "foo bar",
-        },
+        }
     }
     input: {
         console.log(D);
@@ -37,7 +37,6 @@ object: {
                 VALUE: 42,
             },
         },
-        side_effects: true,
         unsafe: true,
     }
     input: {
@@ -121,7 +120,7 @@ mixed: {
         properties: true,
     }
     input: {
-        var FOO = { BAR: 0 };
+        const FOO = { BAR: 0 };
         console.log(FOO.BAR);
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -131,7 +130,7 @@ mixed: {
         console.log(CONFIG);
     }
     expect: {
-        var FOO = { BAR: 0 };
+        const FOO = { BAR: 0 };
         console.log("moo");
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -141,8 +140,9 @@ mixed: {
         console.log(CONFIG);
     }
     expect_warnings: [
-        "WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:4,22]",
-        "WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:7,8]",
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:126,22]',
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:127,22]',
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:129,8]',
     ]
 }
 
@@ -160,59 +160,3 @@ issue_1801: {
         console.log(!0);
     }
 }
-
-issue_1986: {
-    options = {
-        global_defs: {
-            "@alert": "console.log",
-        },
-    }
-    input: {
-        alert(42);
-    }
-    expect: {
-        console.log(42);
-    }
-}
-
-issue_2167: {
-    options = {
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        global_defs: {
-            "@isDevMode": "function(){}",
-        },
-        passes: 2,
-        side_effects: true,
-    }
-    input: {
-        if (isDevMode()) {
-            greetOverlord();
-        }
-        doWork();
-    }
-    expect: {
-        doWork();
-    }
-}
-
-issue_3217: {
-    options = {
-        collapse_vars: true,
-        global_defs: {
-            "@o": "{fn:function(){var a=42;console.log(a)}}",
-        },
-        inline: true,
-        properties: true,
-        reduce_vars: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        o.fn();
-    }
-    expect: {
-        console.log(42);
-    }
-}

test/compress/harmony.js

@@ -0,0 +1,511 @@
+arrow_function_parens: {
+    input: {
+        something && (() => {});
+    }
+    expect_exact: "something&&(()=>{});"
+}
+arrow_function_parens_2: {
+    input: {
+        (() => null)();
+    }
+    expect_exact: "(()=>null)();"
+}
+
+typeof_arrow_functions: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = typeof (x) => null;
+    }
+    expect_exact: "var foo=\"function\";"
+}
+
+classes: {
+    input: {
+        class SomeClass {
+            constructor() {
+            };
+            foo() {};
+        };
+        class NoSemi {
+            constructor(...args) {
+            }
+            foo() {}
+        };
+        class ChildClass extends SomeClass {};
+        var asExpression = class AsExpression {};
+        var nameless = class {};
+    }
+    expect_exact: "class SomeClass{constructor(){}foo(){}}class NoSemi{constructor(...args){}foo(){}}class ChildClass extends SomeClass{}var asExpression=class AsExpression{};var nameless=class{};"
+}
+
+class_statics: {
+    input: {
+        x = class {
+            static staticMethod() {}
+            static get foo() {}
+            static set bar() {}
+            static() { /* "static" can be a method name! */ }
+            get() { /* "get" can be a method name! */ }
+            set() { /* "set" can be a method name! */ }
+        }
+    }
+    expect_exact: "x=class{static staticMethod(){}static get foo(){}static set bar(){}static(){}get(){}set(){}};"
+}
+
+class_name_can_be_mangled: {
+    mangle = { };
+    input: {
+        function x() {
+            class Foo {
+            }
+            var class1 = Foo
+            var class2 = class Bar {}
+        }
+    }
+    expect: {
+        function x() {
+            class a { }
+            var n = a
+            var r = class a {}
+        }
+    }
+}
+
+class_name_can_be_preserved: {
+    mangle = {
+        keep_classnames: true
+    }
+    input: {
+        function x() {
+            (class Baz { });
+            class Foo {};
+        }
+    }
+    expect: {
+        function x() {
+            (class Baz { });
+            class Foo {};
+        }
+    }
+}
+
+classes_can_have_generators: {
+    input: {
+        class Foo {
+            *bar() {}
+            static *baz() {}
+        }
+    }
+    expect: {
+        class Foo {
+            *bar() {}
+            static *baz() {}
+        }
+    }
+}
+
+classes_can_have_computed_generators: {
+    input: {
+        class C4 {
+            *['constructor']() {}
+        }
+    }
+    expect: {
+        class C4 {
+            *['constructor']() {}
+        }
+    }
+}
+
+classes_can_have_computed_static: {
+    input: {
+        class C4 {
+            static ['constructor']() {}
+        }
+    }
+    expect: {
+        class C4 {
+            static ['constructor']() {}
+        }
+    }
+}
+
+class_methods_and_getters_with_keep_quoted_props_enabled: {
+    beautify = {
+        quote_style: 3,
+        keep_quoted_props: true,
+    }
+    input: {
+        class clss {
+            a() {}
+            "b"() {}
+            get c() { return "c"}
+            get "d"() { return "d"}
+            set e(a) { doSomething(a); }
+            set 'f'(a) { doSomething(b); }
+            static g() {}
+            static "h"() {}
+        }
+    }
+    expect_exact: 'class clss{a(){}"b"(){}get c(){return"c"}get"d"(){return"d"}set e(a){doSomething(a)}set\'f\'(a){doSomething(b)}static g(){}static"h"(){}}'
+}
+
+classes_with_expression_as_expand: {
+    input: {
+        class D extends (calls++, C) {}
+    }
+    expect_exact: "class D extends(calls++,C){}"
+}
+
+new_target: {
+    input: {
+        new.target;
+        new.target.name;
+    }
+    expect_exact: "new.target;new.target.name;"
+}
+
+number_literals: {
+    input: {
+        0b1001;
+        0B1001;
+        0o11;
+        0O11;
+    }
+
+    expect: {
+        9;
+        9;
+        9;
+        9;
+    }
+}
+
+import_statement: {
+    input: {
+        import "mod-name";
+        import Foo from "bar";
+        import { Bar, Baz } from 'lel';
+        import Bar, { Foo } from 'lel';
+        import { Bar as kex, Baz as food } from 'lel';
+    }
+    expect_exact: 'import"mod-name";import Foo from"bar";import{Bar,Baz}from"lel";import Bar,{Foo}from"lel";import{Bar as kex,Baz as food}from"lel";'
+}
+
+import_all_statement: {
+    input: {
+        import * from 'lel';
+        import * as Lel from 'lel';
+    }
+    expect_exact: 'import*from"lel";import*as Lel from"lel";'
+}
+
+export_statement: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default 1 + 2;
+        export var foo = 4;
+        export let foo = 6;
+        export const foo = 6;
+        export function foo() {};
+        export class foo { };
+    }
+    expect_exact: "export default 3;export var foo=4;export let foo=6;export const foo=6;export function foo(){};export class foo{};"
+}
+
+export_default_object_expression: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default {
+            foo: 1 + 2,
+            bar() { return 4; },
+            get baz() { return this.foo; },
+        };
+    }
+    expect_exact: "export default{foo:3,bar(){return 4},get baz(){return this.foo}};"
+}
+
+export_default_array: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default [ 1 + 2, foo ];
+    }
+    expect_exact: "export default[3,foo];"
+}
+
+export_module_statement: {
+    input: {
+        export * from "a.js";
+        export {A} from "a.js";
+        export {A, B} from "a.js";
+        export {C};
+    }
+    expect_exact: 'export*from"a.js";export{A}from"a.js";export{A,B}from"a.js";export{C};'
+}
+
+import_statement_mangling: {
+    mangle = { toplevel: true };
+    input: {
+        import Foo from "foo";
+        import Bar, {Food} from "lel";
+        import {What as Whatever} from "lel";
+        Foo();
+        Bar();
+        Food();
+        Whatever();
+    }
+    expect: {
+        import l from "foo";
+        import e, {Food as o} from "lel";
+        import {What as f} from "lel";
+        l();
+        e();
+        o();
+        f();
+    }
+}
+
+export_statement_mangling: {
+    mangle = { };
+    input: {
+        export var foo = 6;
+        export function bar() { }
+        export class Baz { }
+        bar(foo, Baz)
+    }
+    expect: {
+        export var foo = 6;
+        export function bar() { }
+        export class Baz { }
+        bar(foo, Baz)
+    }
+}
+
+// https://github.com/mishoo/UglifyJS2/issues/1021
+regression_for_of_const: {
+    input: {
+        for (const x of y) {}
+        for (const x in y) {}
+    }
+    expect: {
+        for (const x of y);for (const x in y);
+    }
+}
+
+// Fabio: My patches accidentally caused a crash whenever
+// there's an extraneous set of parens around an object.
+regression_cannot_destructure: {
+    input: {
+        var x = ({ x : 3 });
+        x(({ x: 3 }));
+    }
+    expect_exact: "var x={x:3};x({x:3});";
+}
+
+regression_cannot_use_of: {
+    input: {
+        function of() {
+        }
+        var of = "is a valid variable name";
+        of = { of: "is ok" };
+        x.of;
+        of: foo()
+    }
+    expect: {
+        function of(){}
+        var of="is a valid variable name";
+        of={of:"is ok"};
+        x.of;
+        foo();  /* Label statement missing? No prob. */
+    }
+}
+
+fat_arrow_as_param: {
+    input: {
+        foo(x => x);
+        foo(x => x, y => y);
+
+        foo(x => (x, x));
+        foo(x => (x, x), y => (y, y));
+    }
+    expect_exact: "foo(x=>x);foo(x=>x,y=>y);foo(x=>(x,x));foo(x=>(x,x),y=>(y,y));"
+}
+
+default_assign: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, b = 3) {
+            console.log(a);
+        }
+
+        g = ([[] = 123]) => {};
+        h = ([[x, y, z] = [4, 5, 6]] = []) => {};
+
+        function i([[x, y, z] = [4, 5, 6]] = []) {
+            console.log(b);
+        };
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+
+        g = ([[] = 123]) => {};
+        h = ([[x, y, z] = [4, 5, 6]] = []) => {};
+
+        function i([[x, y, z] = [4, 5, 6]] = []) {
+            console.log(b);
+        };
+    }
+}
+
+expansion: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, ...b) {
+            console.log(a);
+        }
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+    }
+}
+
+issue_1613: {
+  mangle = { toplevel: true };
+  input: {
+    const name = 1;
+    const foo = {
+      name
+    };
+  }
+  expect_exact: "const n=1;const c={name:n};"
+}
+
+format_methods: {
+    beautify = {
+        beautify: true,
+    }
+    input: {
+        class A extends B {constructor(a){x()} static s(b,c){y()} run(d,e,f){z()}}
+    }
+    expect_exact: [
+        "class A extends B {",
+        "    constructor(a) {",
+        "        x();",
+        "    }",
+        "    static s(b, c) {",
+        "        y();",
+        "    }",
+        "    run(d, e, f) {",
+        "        z();",
+        "    }",
+        "}",
+    ]
+}
+
+issue_1898: {
+    options = {
+    }
+    mangle = {
+    }
+    input: {
+        class Foo {
+            bar() {
+                for (const x of [ 6, 5 ]) {
+                    for (let y of [ 4, 3 ]) {
+                        for (var z of [ 2, 1 ]) {
+                            console.log(x, y, z);
+                        }
+                    }
+                }
+            }
+        }
+        new Foo().bar();
+    }
+    expect: {
+        class Foo {
+            bar() {
+                for (const n of [ 6, 5 ])
+                    for (let r of [ 4, 3 ])
+                        for (var o of [ 2, 1 ])
+                            console.log(n, r, o);
+            }
+        }
+        new Foo().bar();
+    }
+}
+
+issue_1753: {
+    mangle = { safari10: true };
+    input: {
+        class SomeClass {
+            constructor(props) {
+                let pickedSets = [];
+                for (let i = 0; i < 6; i++) {
+                    pickedSets.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+                }
+            }
+        }
+    }
+    expect: {
+        class SomeClass {
+            constructor(r) {
+                let a = [];
+                for (let s = 0; s < 6; s++)
+                    a.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+            }
+        }
+    }
+}
+
+issue_1753_disable: {
+    mangle = { safari10: false }
+    input: {
+        class SomeClass {
+            constructor(props) {
+                let pickedSets = [];
+                for (let i = 0; i < 6; i++) {
+                    pickedSets.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+                }
+            }
+        }
+    }
+    expect: {
+        class SomeClass {
+            constructor(r) {
+                let a = [];
+                for (let r = 0; r < 6; r++)
+                    a.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+            }
+        }
+    }
+}

test/compress/hoist.js

@@ -0,0 +1,85 @@
+
+hoist_vars: {
+    options = {
+        hoist_vars: true
+    }
+    input: {
+        function a() {
+            bar();
+            var var1;
+            var var2;
+        }
+        function b(anArg) {
+            bar();
+            var var1;
+            var anArg;
+        }
+    }
+    expect: {
+        function a() {
+            var var1, var2;  // Vars go up and are joined
+            bar();
+        }
+        function b(anArg) {
+            var var1;
+            bar();
+            // But vars named like arguments go away!
+        }
+    }
+}
+
+hoist_funs: {
+    options = {
+        hoist_funs: true
+    }
+    input: {
+        function a() {
+            bar();
+            function foo() {}
+        }
+    }
+    expect: {
+        function a() {
+            function foo() {}  // Funs go up
+            bar();
+        }
+    }
+}
+
+hoist_no_destructurings: {
+    options = {
+        hoist_vars: true,
+        hoist_funs: true
+    }
+    input: {
+        function a([anArg]) {
+            bar();
+            var var1;
+            var anArg;  // Because anArg is already declared, this goes away!
+        }
+    }
+    expect: {
+        function a([anArg]) {
+            var var1;
+            bar();
+        }
+    }
+}
+
+dont_hoist_var_destructurings: {
+    options = {
+        hoist_vars: true,
+        hoist_funs: true
+    }
+    input: {
+        function x() {
+            // If foo is null or undefined, this should be an exception
+            var {x,y} = foo;
+        }
+    }
+    expect: {
+        function x() {
+            var {x,y} = foo;
+        }
+    }
+}

test/compress/hoist_props.js

@@ -1,916 +0,0 @@
-issue_2377_1: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var obj = {
-            foo: 1,
-            bar: 2,
-            square: function(x) {
-                return x * x;
-            },
-            cube: function(x) {
-                return x * x * x;
-            },
-        };
-        console.log(obj.foo, obj.cube(3));
-    }
-    expect: {
-        var obj_foo = 1, obj_cube = function(x) {
-            return x * x * x;
-        };
-        console.log(obj_foo, obj_cube(3));
-    }
-    expect_stdout: "1 27"
-}
-
-issue_2377_2: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var obj = {
-            foo: 1,
-            bar: 2,
-            square: function(x) {
-                return x * x;
-            },
-            cube: function(x) {
-                return x * x * x;
-            },
-        };
-        console.log(obj.foo, obj.cube(3));
-    }
-    expect: {
-        console.log(1, (x = 3, x * x * x));
-        var x;
-    }
-    expect_stdout: "1 27"
-}
-
-issue_2377_3: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        passes: 4,
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var obj = {
-            foo: 1,
-            bar: 2,
-            square: function(x) {
-                return x * x;
-            },
-            cube: function(x) {
-                return x * x * x;
-            },
-        };
-        console.log(obj.foo, obj.cube(3));
-    }
-    expect: {
-        console.log(1, 27);
-    }
-    expect_stdout: "1 27"
-}
-
-direct_access_1: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = 0;
-        var obj = {
-            a: 1,
-            b: 2,
-        };
-        for (var k in obj) a++;
-        console.log(a, obj.a);
-    }
-    expect: {
-        var a = 0;
-        var obj = {
-            a: 1,
-            b: 2,
-        };
-        for (var k in obj) a++;
-        console.log(a, obj.a);
-    }
-    expect_stdout: "2 1"
-}
-
-direct_access_2: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = { a: 1 };
-        var f = function(k) {
-            if (o[k]) return "PASS";
-        };
-        console.log(f("a"));
-    }
-    expect: {
-        var o = { a: 1 };
-        console.log(function(k) {
-            if (o[k]) return "PASS";
-        }("a"));
-    }
-    expect_stdout: "PASS"
-}
-
-direct_access_3: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = { a: 1 };
-        o.b;
-        console.log(o.a);
-    }
-    expect: {
-        var o = { a: 1 };
-        o.b;
-        console.log(o.a);
-    }
-    expect_stdout: "1"
-}
-
-single_use: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var obj = {
-            bar: function() {
-                return 42;
-            },
-        };
-        console.log(obj.bar());
-    }
-    expect: {
-        console.log({
-            bar: function() {
-                return 42;
-            },
-        }.bar());
-    }
-}
-
-name_collision_1: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-    }
-    input: {
-        var obj_foo = 1;
-        var obj_bar = 2;
-        function f() {
-            var obj = {
-                foo: 3,
-                bar: 4,
-                "b-r": 5,
-                "b+r": 6,
-                "b!r": 7,
-            };
-            console.log(obj_foo, obj.foo, obj.bar, obj["b-r"], obj["b+r"], obj["b!r"]);
-        }
-        f();
-    }
-    expect: {
-        var obj_foo = 1;
-        var obj_bar = 2;
-        function f() {
-            var obj_foo$0 = 3,
-                obj_bar = 4,
-                obj_b_r = 5,
-                obj_b_r$0 = 6,
-                obj_b_r$1 = 7;
-            console.log(obj_foo, obj_foo$0, obj_bar, obj_b_r, obj_b_r$0, obj_b_r$1);
-        }
-        f();
-    }
-    expect_stdout: "1 3 4 5 6 7"
-}
-
-name_collision_2: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-    }
-    input: {
-        var o = {
-            p: 1,
-            "+": function(x) {
-                return x;
-            },
-            "-": function(x) {
-                return x + 1;
-            }
-        }, o__$0 = 2, o__$1 = 3;
-        console.log(o.p === o.p, o["+"](4), o["-"](5), o__$0, o__$1);
-    }
-    expect: {
-        var o_p = 1,
-            o__ = function(x) {
-                return x;
-            },
-            o__$2 = function(x) {
-                return x + 1;
-            },
-            o__$0 = 2,
-            o__$1 = 3;
-        console.log(o_p === o_p, o__(4), o__$2(5), o__$0, o__$1);
-    }
-    expect_stdout: "true 4 6 2 3"
-}
-
-name_collision_3: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-    }
-    input: {
-        var o = {
-            p: 1,
-            "+": function(x) {
-                return x;
-            },
-            "-": function(x) {
-                return x + 1;
-            }
-        }, o__$0 = 2, o__$1 = 3;
-        console.log(o.p === o.p, o["+"](4), o["-"](5));
-    }
-    expect: {
-        var o_p = 1,
-            o__ = function(x) {
-                return x;
-            },
-            o__$2 = function(x) {
-                return x + 1;
-            },
-            o__$0 = 2,
-            o__$1 = 3;
-        console.log(o_p === o_p, o__(4), o__$2(5));
-    }
-    expect_stdout: "true 4 6"
-}
-
-contains_this_1: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            u: function() {
-                return this === this;
-            },
-            p: 1
-        };
-        console.log(o.p, o.p);
-    }
-    expect: {
-        console.log(1, 1);
-    }
-    expect_stdout: "1 1"
-}
-
-contains_this_2: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            u: function() {
-                return this === this;
-            },
-            p: 1
-        };
-        console.log(o.p, o.p, o.u);
-    }
-    expect: {
-        console.log(1, 1, function() {
-            return this === this;
-        });
-    }
-    expect_stdout: true
-}
-
-contains_this_3: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            u: function() {
-                return this === this;
-            },
-            p: 1
-        };
-        console.log(o.p, o.p, o.u());
-    }
-    expect: {
-        var o = {
-            u: function() {
-                return this === this;
-            },
-            p: 1
-        };
-        console.log(o.p, o.p, o.u());
-    }
-    expect_stdout: "1 1 true"
-}
-
-new_this: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            a: 1,
-            b: 2,
-            f: function(a) {
-                this.b = a;
-            }
-        };
-        console.log(new o.f(o.a).b, o.b);
-    }
-    expect: {
-        console.log(new function(a) {
-            this.b = a;
-        }(1).b, 2);
-    }
-    expect_stdout: "1 2"
-}
-
-issue_2473_1: {
-    options = {
-        hoist_props: false,
-        reduce_vars: true,
-        top_retain: [
-            "x",
-            "y"
-        ],
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var x = {};
-        var y = [];
-        var z = {};
-    }
-    expect: {
-        var x = {};
-        var y = [];
-    }
-}
-
-issue_2473_2: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-        top_retain: [
-            "x",
-            "y"
-        ],
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var x = {};
-        var y = [];
-        var z = {};
-    }
-    expect: {
-        var x = {};
-        var y = [];
-    }
-}
-
-issue_2473_3: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-        top_retain: "o",
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            a: 1,
-            b: 2,
-        };
-        console.log(o.a, o.b);
-    }
-    expect: {
-        var o = {
-            a: 1,
-            b: 2,
-        };
-        console.log(o.a, o.b);
-    }
-    expect_stdout: "1 2"
-}
-
-issue_2473_4: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-        top_retain: "o",
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            var o = {
-                a: 1,
-                b: 2,
-            };
-            console.log(o.a, o.b);
-        })();
-    }
-    expect: {
-        (function() {
-            var o_a = 1, o_b = 2;
-            console.log(o_a, o_b);
-        })();
-    }
-    expect_stdout: "1 2"
-}
-
-issue_2508_1: {
-    options = {
-        collapse_vars: true,
-        hoist_props: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            a: [ 1 ],
-            f: function(x) {
-                console.log(x);
-            }
-        };
-        o.f(o.a);
-    }
-    expect: {
-        (function(x) {
-            console.log(x);
-        })([ 1 ]);
-    }
-    expect_stdout: true
-}
-
-issue_2508_2: {
-    options = {
-        collapse_vars: true,
-        hoist_props: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            a: { b: 2 },
-            f: function(x) {
-                console.log(x);
-            }
-        };
-        o.f(o.a);
-    }
-    expect: {
-        (function(x) {
-            console.log(x);
-        })({ b: 2 });
-    }
-    expect_stdout: true
-}
-
-issue_2508_3: {
-    options = {
-        collapse_vars: true,
-        hoist_props: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            a: [ o ],
-            f: function(x) {
-                console.log(x);
-            }
-        };
-        o.f(o.a);
-    }
-    expect: {
-        var o = {
-            a: [ o ],
-            f: function(x) {
-                console.log(x);
-            }
-        };
-        o.f(o.a);
-    }
-    expect_stdout: true
-}
-
-issue_2508_4: {
-    options = {
-        collapse_vars: true,
-        hoist_props: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            a: { b: o },
-            f: function(x) {
-                console.log(x);
-            }
-        };
-        o.f(o.a);
-    }
-    expect: {
-        var o = {
-            a: { b: o },
-            f: function(x) {
-                console.log(x);
-            }
-        };
-        o.f(o.a);
-    }
-    expect_stdout: true
-}
-
-issue_2508_5: {
-    options = {
-        collapse_vars: true,
-        hoist_props: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            f: function(x) {
-                console.log(x);
-            }
-        };
-        o.f(o.f);
-    }
-    expect: {
-        var o_f = function(x) {
-            console.log(x);
-        };
-        o_f(o_f);
-    }
-    expect_stdout: true
-}
-
-issue_2519: {
-    options = {
-        collapse_vars: true,
-        evaluate: true,
-        hoist_props: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        function testFunc() {
-            var dimensions = {
-                minX: 5,
-                maxX: 6,
-            };
-            var scale = 1;
-            var d = {
-                x: (dimensions.maxX + dimensions.minX) / 2,
-            };
-            return d.x * scale;
-        }
-        console.log(testFunc());
-    }
-    expect: {
-        function testFunc() {
-            return +((6 + 5) / 2);
-        }
-        console.log(testFunc());
-    }
-    expect_stdout: "5.5"
-}
-
-undefined_key: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        join_vars: true,
-        passes: 4,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a, o = {};
-        o[a] = 1;
-        o.b = 2;
-        console.log(o[a] + o.b);
-    }
-    expect: {
-        console.log(3);
-    }
-    expect_stdout: "3"
-}
-
-issue_3021: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        var a = 1, b = 2;
-        (function() {
-            b = a;
-            if (a++ + b--)
-                return 1;
-            return;
-            var b = {};
-        })();
-        console.log(a, b);
-    }
-    expect: {
-        var a = 1, b = 2;
-        (function() {
-            b = a;
-            if (a++ + b--)
-                return 1;
-            return;
-            var b = {};
-        })();
-        console.log(a, b);
-    }
-    expect_stdout: "2 2"
-}
-
-issue_3046: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a) {
-            do {
-                var b = {
-                    c: a++
-                };
-            } while (b.c && a);
-            return a;
-        }(0));
-    }
-    expect: {
-        console.log(function(a) {
-            do {
-                var b_c = a++;
-            } while (b_c && a);
-            return a;
-        }(0));
-    }
-    expect_stdout: "1"
-}
-
-issue_3071_1: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        join_vars: true,
-        passes: 3,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            var obj = {};
-            obj.one = 1;
-            obj.two = 2;
-            console.log(obj.one);
-        })();
-    }
-    expect: {
-        console.log(1);
-    }
-    expect_stdout: "1"
-}
-
-issue_3071_2: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        join_vars: true,
-        passes: 3,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            obj = {};
-            obj.one = 1;
-            obj.two = 2;
-            console.log(obj.one);
-            var obj;
-        })();
-    }
-    expect: {
-        console.log(1);
-    }
-    expect_stdout: "1"
-}
-
-issue_3071_2_toplevel: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        join_vars: true,
-        passes: 3,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            obj = {};
-            obj.one = 1;
-            obj.two = 2;
-            console.log(obj.one);
-            var obj;
-        })();
-    }
-    expect: {
-        console.log(1);
-    }
-    expect_stdout: "1"
-}
-
-issue_3071_3: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        var c = 0;
-        (function(a, b) {
-            (function f(o) {
-                var n = 2;
-                while (--b + (o = {
-                    p: c++,
-                }) && --n > 0);
-            })();
-        })();
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        (function(a, b) {
-            (function f(o) {
-                var n = 2;
-                while (--b + (o = {
-                    p: c++,
-                }) && --n > 0);
-            })();
-        })();
-        console.log(c);
-    }
-    expect_stdout: "2"
-}
-
-issue_3411: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        var c = 1;
-        !function f() {
-            var o = {
-                p: --c && f()
-            };
-            +o || console.log("PASS");
-        }();
-    }
-    expect: {
-        var c = 1;
-        !function f() {
-            var o_p = --c && f();
-            +{} || console.log("PASS");
-        }();
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3440: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            function f() {
-                console.log(o.p);
-            }
-            var o = {
-                p: "PASS",
-            };
-            return f;
-        })()();
-    }
-    expect: {
-        (function() {
-            var o_p = "PASS";
-            return function() {
-                console.log(o_p);
-            };
-        })()();
-    }
-    expect_stdout: "PASS"
-}

test/compress/hoist_vars.js

@@ -88,24 +88,3 @@ sequences_funs: {
         }
     }
 }
-
-issue_2295: {
-    options = {
-        collapse_vars: true,
-        hoist_vars: true,
-    }
-    input: {
-        function foo(o) {
-            var a = o.a;
-            if (a) return a;
-            var a = 1;
-        }
-    }
-    expect: {
-        function foo(o) {
-            var a = o.a;
-            if (a) return a;
-            a = 1;
-        }
-    }
-}

test/compress/html_comments.js

@@ -1,107 +1,64 @@
 html_comment_in_expression: {
     input: {
-        (function(a, b) {
-            console.log(a < !--b && a-- > b, a, b);
-        })(1, 2);
+        function f(a, b, x, y) { return a < !--b && x-- > y; }
     }
-    expect_exact: "(function(a,b){console.log(a<! --b&&a-- >b,a,b)})(1,2);"
-    expect_stdout: "false 1 1"
+    expect_exact: "function f(a,b,x,y){return a< !--b&&x-- >y}";
 }
 
 html_comment_in_less_than: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a < !--b,
-                a < !--b + c,
-                a + b < !--c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a < !--b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a<! --b,a<! --b+c,a+b<! --c,a,b,c)})(1,2,3);"
-    expect_stdout: "false true false 1 0 2"
+    expect_exact: "function f(a,b){return a< !--b}";
 }
 
 html_comment_in_left_shift: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a << !--b,
-                a << !--b + c,
-                a + b << !--c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a << !--b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a<<! --b,a<<! --b+c,a+b<<! --c,a,b,c)})(1,2,3);"
-    expect_stdout: "1 16 1 1 0 2"
-}
-
-html_comment_in_greater_than: {
-    input: {
-        (function(a, b, c) {
-            console.log(
-                a-- > b,
-                a-- > b + c,
-                a + b-- > c,
-                a, b, c
-            );
-        })(1, 2, 3);
-    }
-    expect_exact: "(function(a,b,c){console.log(a-- >b,a-- >b+c,a+b-- >c,a,b,c)})(1,2,3);"
-    expect_stdout: "false false false -1 1 3"
-}
-
-html_comment_in_greater_than_or_equal: {
-    input: {
-        (function(a, b, c) {
-            console.log(
-                a-- >= b,
-                a-- >= b + c,
-                a + b-- >= c,
-                a, b, c
-            );
-        })(1, 2, 3);
-    }
-    expect_exact: "(function(a,b,c){console.log(a-- >=b,a-- >=b+c,a+b-- >=c,a,b,c)})(1,2,3);"
-    expect_stdout: "false false false -1 1 3"
+    expect_exact: "function f(a,b){return a<< !--b}";
 }
 
 html_comment_in_right_shift: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a-- >> b,
-                a-- >> b + c,
-                a + b-- >> c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a-- >> b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a-- >>b,a-- >>b+c,a+b-- >>c,a,b,c)})(1,2,3);"
-    expect_stdout: "0 0 0 -1 1 3"
+    expect_exact: "function f(a,b){return a-- >>b}";
 }
 
 html_comment_in_zero_fill_right_shift: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a-- >>> b,
-                a-- >>> b + c,
-                a + b-- >>> c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a-- >>> b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a-- >>>b,a-- >>>b+c,a+b-- >>>c,a,b,c)})(1,2,3);"
-    expect_stdout: "0 0 0 -1 1 3"
+    expect_exact: "function f(a,b){return a-- >>>b}";
+}
+
+html_comment_in_greater_than: {
+    input: {
+        function f(a, b) { return a-- > b; }
+    }
+    expect_exact: "function f(a,b){return a-- >b}";
+}
+
+html_comment_in_greater_than_or_equal: {
+    input: {
+        function f(a, b) { return a-- >= b; }
+    }
+    expect_exact: "function f(a,b){return a-- >=b}";
 }
 
 html_comment_in_string_literal: {
     input: {
-        console.log("<!--HTML-->comment in<!--string literal-->".length);
+        function f() { return "<!--HTML-->comment in<!--string literal-->"; }
     }
-    expect_exact: 'console.log("\\x3c!--HTML--\\x3ecomment in\\x3c!--string literal--\\x3e".length);'
-    expect_stdout: "42"
+    expect_exact: 'function f(){return"\\x3c!--HTML--\\x3ecomment in\\x3c!--string literal--\\x3e"}';
+}
+
+html_comment_after_multiline_comment: {
+    input: {
+        var foo; /*
+*/-->   var bar;
+        var foobar;
+    }
+    expect_exact: "var foo;var foobar;"
 }

test/compress/if_return.js

@@ -1,14 +1,14 @@
 if_return_1: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -24,15 +24,15 @@ if_return_1: {
 
 if_return_2: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x, y) {
@@ -49,15 +49,15 @@ if_return_2: {
 
 if_return_3: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -75,15 +75,15 @@ if_return_3: {
 
 if_return_4: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x, y) {
@@ -100,15 +100,15 @@ if_return_4: {
 
 if_return_5: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f() {
@@ -126,15 +126,15 @@ if_return_5: {
 
 if_return_6: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -150,15 +150,15 @@ if_return_6: {
 
 if_return_7: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -176,10 +176,10 @@ if_return_7: {
 
 if_return_8: {
     options = {
-        conditionals: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
+        if_return:     true,
+        sequences:     true,
+        conditionals:  true,
+        side_effects : true,
     }
     input: {
         function f(e) {
@@ -220,15 +220,15 @@ if_return_8: {
 
 issue_1089: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function x() {
@@ -243,7 +243,7 @@ issue_1089: {
     expect: {
         function x() {
             var f = document.getElementById("fname");
-            if (12345 < f.files[0].size)
+            if (f.files[0].size > 12345)
                 return alert("alert"), f.focus(), !1;
         }
     }
@@ -251,9 +251,9 @@ issue_1089: {
 
 issue_1437: {
     options = {
-        conditionals: false,
-        if_return: true,
-        sequences: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : false
     }
     input: {
         function x() {
@@ -281,9 +281,9 @@ issue_1437: {
 
 issue_1437_conditionals: {
     options = {
-        conditionals: true,
-        if_return: true,
-        sequences: true,
+        conditionals : true,
+        if_return    : true,
+        sequences    : true
     }
     input: {
         function x() {
@@ -302,274 +302,3 @@ issue_1437_conditionals: {
         }
     }
 }
-
-issue_512: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function a() {
-            if (b()) {
-                c();
-                return;
-            }
-            throw e;
-        }
-    }
-    expect: {
-        function a() {
-            if (!b()) throw e;
-            c();
-        }
-    }
-}
-
-if_var_return: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        join_vars: true,
-        sequences: true,
-    }
-    input: {
-        function f() {
-            var a;
-            return;
-            var b;
-        }
-        function g() {
-            var a;
-            if (u()) {
-                var b;
-                return v();
-                var c;
-            }
-            var d;
-            if (w()) {
-                var e;
-                return x();
-                var f;
-            } else {
-                var g;
-                y();
-                var h;
-            }
-            var i;
-            z();
-            var j;
-        }
-    }
-    expect: {
-        function f() {
-            var a, b;
-        }
-        function g() {
-            var a, b, c, d, e, f, g, h, i, j;
-            return u() ? v() : w() ? x() : (y(), z(), void 0);
-        }
-    }
-}
-
-if_if_return_return: {
-    options = {
-        conditionals: true,
-        if_return: true,
-    }
-    input: {
-        function f(a, b) {
-            if (a) {
-                if (b)
-                    return b;
-                return;
-            }
-            g();
-        }
-    }
-    expect: {
-        function f(a, b) {
-            if (a)
-                return b || void 0;
-            g();
-        }
-    }
-}
-
-if_body_return_1: {
-    options = {
-        if_return: true,
-    }
-    input: {
-        var c = "PASS";
-        function f(a, b) {
-            if (a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect: {
-        var c = "PASS";
-        function f(a, b) {
-            if (a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect_stdout: [
-        "true",
-        "true",
-        "42",
-        "PASS",
-    ]
-}
-
-if_body_return_2: {
-    options = {
-        if_return: true,
-    }
-    input: {
-        var c = "PASS";
-        function f(a, b) {
-            if (0 + a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect: {
-        var c = "PASS";
-        function f(a, b) {
-            if (0 + a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect_stdout: [
-        "true",
-        "true",
-        "42",
-        "PASS",
-    ]
-}
-
-if_body_return_3: {
-    options = {
-        if_return: true,
-    }
-    input: {
-        var c = "PASS";
-        function f(a, b) {
-            if (1 == a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect: {
-        var c = "PASS";
-        function f(a, b) {
-            if (1 != a) return true;
-            if (b) throw new Error(c);
-            return 42;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect_stdout: [
-        "true",
-        "true",
-        "42",
-        "PASS",
-    ]
-}
-
-issue_3600: {
-    options = {
-        if_return: true,
-        inline: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var c = 0;
-        (function() {
-            if ([ ][c++]); else return;
-            return void function() {
-                var b = --b, a = c = 42;
-                return c;
-            }();
-        })();
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        (function() {
-            if ([][c++]) b = --b, c = 42;
-            var b;
-        })();
-        console.log(c);
-    }
-    expect_stdout: "1"
-}

test/compress/issue-1001.js

@@ -0,0 +1,8 @@
+parenthesis_strings_in_parenthesis: {
+    input: {
+        var foo = ('(');
+        a(')');
+
+    }
+    expect_exact: 'var foo="(";a(")");'
+}

test/compress/issue-1034.js

@@ -1,17 +1,8 @@
 non_hoisted_function_after_return: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, cascade: true, side_effects: true
     }
     input: {
         function foo(x) {
@@ -30,35 +21,25 @@ non_hoisted_function_after_return: {
     }
     expect: {
         function foo(x) {
-            return (x ? bar : baz)();
+            return x ? bar() : baz();
             function bar() { return 7 }
             function baz() { return 8 }
         }
     }
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:4,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:7,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:10,12]",
-        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:11,21]"
+        'WARN: Dropping unreachable code [test/compress/issue-1034.js:11,16]',
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:14,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:17,12]",
+        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:18,21]"
     ]
 }
 
 non_hoisted_function_after_return_2a: {
     options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        passes: 2,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, cascade: true, side_effects: true,
+        collapse_vars: false, passes: 2, warnings: "verbose"
     }
     input: {
         function foo(x) {
@@ -84,37 +65,26 @@ non_hoisted_function_after_return_2a: {
         }
     }
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:4,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:4,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:7,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:7,16]",
-        "WARN: Dropping unused variable a [test/compress/issue-1034.js:4,20]",
-        "WARN: Dropping unused function nope [test/compress/issue-1034.js:11,21]",
-        "INFO: pass 0: last_count: Infinity, count: 37",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:9,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:9,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:12,12]",
-        "INFO: Dropping unused variable b [test/compress/issue-1034.js:7,20]",
-        "INFO: Dropping unused variable c [test/compress/issue-1034.js:9,16]",
-        "INFO: pass 1: last_count: 37, count: 18",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:48,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:48,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:51,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:51,16]",
+        "WARN: Dropping unused variable a [test/compress/issue-1034.js:48,20]",
+        "WARN: Dropping unused function nope [test/compress/issue-1034.js:55,21]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:53,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:53,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:56,12]",
+        "WARN: Dropping unused variable b [test/compress/issue-1034.js:51,20]",
+        "WARN: Dropping unused variable c [test/compress/issue-1034.js:53,16]",
     ]
 }
 
 non_hoisted_function_after_return_2b: {
     options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, cascade: true, side_effects: true,
+        collapse_vars: false
     }
     input: {
         function foo(x) {
@@ -138,173 +108,11 @@ non_hoisted_function_after_return_2b: {
         }
     }
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:6,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:6,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:8,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:8,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:12,12]",
-    ]
-}
-
-non_hoisted_function_after_return_strict: {
-    options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        "use strict";
-        function foo(x) {
-            if (x) {
-                return bar();
-                not_called1();
-            } else {
-                return baz();
-                not_called2();
-            }
-            function bar() { return 7; }
-            return not_reached;
-            function UnusedFunction() {}
-            function baz() { return 8; }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect: {
-        "use strict";
-        function foo(x) {
-            return (x ? bar : baz)();
-            function bar() { return 7 }
-            function baz() { return 8 }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect_stdout: "8 7"
-    expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:5,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:8,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:11,12]",
-        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:12,21]",
-    ]
-}
-
-non_hoisted_function_after_return_2a_strict: {
-    options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        passes: 2,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        "use strict";
-        function foo(x) {
-            if (x) {
-                return bar(1);
-                var a = not_called(1);
-            } else {
-                return bar(2);
-                var b = not_called(2);
-            }
-            var c = bar(3);
-            function bar(x) { return 7 - x; }
-            function nope() {}
-            return b || c;
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect: {
-        "use strict";
-        function foo(x) {
-            return bar(x ? 1 : 2);
-            function bar(x) {
-                return 7 - x;
-            }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect_stdout: "5 6"
-    expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:5,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:5,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:8,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:8,16]",
-        "WARN: Dropping unused variable a [test/compress/issue-1034.js:5,20]",
-        "WARN: Dropping unused function nope [test/compress/issue-1034.js:12,21]",
-        "INFO: pass 0: last_count: Infinity, count: 48",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:10,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:10,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:13,12]",
-        "INFO: Dropping unused variable b [test/compress/issue-1034.js:8,20]",
-        "INFO: Dropping unused variable c [test/compress/issue-1034.js:10,16]",
-        "INFO: pass 1: last_count: 48, count: 29",
-    ]
-}
-
-non_hoisted_function_after_return_2b_strict: {
-    options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        "use strict";
-        function foo(x) {
-            if (x) {
-                return bar(1);
-            } else {
-                return bar(2);
-                var b;
-            }
-            var c = bar(3);
-            function bar(x) {
-                return 7 - x;
-            }
-            return b || c;
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect: {
-        "use strict";
-        function foo(x) {
-            return bar(x ? 1 : 2);
-            function bar(x) { return 7 - x; }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect_stdout: "5 6"
-    expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:7,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:7,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:9,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:9,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:13,12]",
+        // duplicate warnings no longer emitted
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:95,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:95,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:97,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:97,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:101,12]",
     ]
 }

test/compress/issue-1041.js

@@ -1,9 +1,21 @@
+const_declaration: {
+    options = {
+        evaluate: true
+    };
+
+    input: {
+        const goog = goog || {};
+    }
+    expect: {
+        const goog = goog || {};
+    }
+}
+
 const_pragma: {
     options = {
         evaluate: true,
-        reduce_funcs: true,
         reduce_vars: true,
-    }
+    };
 
     input: {
         /** @const */ var goog = goog || {};
@@ -17,9 +29,8 @@ const_pragma: {
 not_const: {
     options = {
         evaluate: true,
-        reduce_funcs: true,
         reduce_vars: true,
-    }
+    };
 
     input: {
         var goog = goog || {};

test/compress/issue-1043.js

@@ -0,0 +1,30 @@
+issue_1043: {
+    options = {
+        side_effects: true
+    };
+
+    input: {
+        function* range(start = 0, end = null, step = 1) {
+            if (end == null) {
+                end = start;
+                start = 0;
+            }
+
+            for (let i = start; i < end; i += step) {
+                yield i;
+            }
+        }
+    }
+
+    expect: {
+        function* range(start = 0, end = null, step = 1) {
+            if (null == end) {
+                end = start;
+                start = 0;
+            }
+
+            for (let i = start; i < end; i += step)
+                yield i;
+        }
+    }
+}

test/compress/issue-1044.js

@@ -0,0 +1,9 @@
+issue_1044: {
+    options = { evaluate: true, conditionals: true };
+    input: {
+        const mixed = Base ? class extends Base {} : class {}
+    }
+    expect: {
+        const mixed = Base ? class extends Base {} : class {}
+    }
+}

test/compress/issue-1052.js

@@ -1,91 +1,90 @@
 multiple_functions: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             function f() {}
             function g() {}
         } )();
     }
     expect: {
         ( function() {
+            function f() {}
+            function g() {}
+
             // NOTE: other compression steps will reduce this
             // down to just `window`.
             if ( window );
-            function f() {}
-            function g() {}
         } )();
     }
 }
 
 single_function: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             function f() {}
         } )();
     }
     expect: {
         ( function() {
-            if ( window );
             function f() {}
+
+            if ( window );
         } )();
     }
 }
 
 deeply_nested: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             function f() {}
             function g() {}
+
             if ( !document ) {
                 return;
             }
+
             function h() {}
         } )();
     }
     expect: {
         ( function() {
+            function f() {}
+            function g() {}
+
+            function h() {}
+
             // NOTE: other compression steps will reduce this
             // down to just `window`.
             if ( window )
                 if (document);
-            function f() {}
-            function g() {}
-            function h() {}
         } )();
     }
 }
 
 not_hoisted_when_already_nested: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             if ( foo ) function f() {}
+
         } )();
     }
     expect: {
@@ -95,70 +94,3 @@ not_hoisted_when_already_nested: {
         } )();
     }
 }
-
-defun_if_return: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
-    input: {
-        function e() {
-            function f() {}
-            if (!window) return;
-            else function g() {}
-            function h() {}
-        }
-    }
-    expect: {
-        function e() {
-            function f() {}
-            if (window) function g() {}
-            function h() {}
-        }
-    }
-}
-
-defun_hoist_funs: {
-    options = {
-        hoist_funs: true,
-        if_return: true,
-    }
-    input: {
-        function e() {
-            function f() {}
-            if (!window) return;
-            else function g() {}
-            function h() {}
-        }
-    }
-    expect: {
-        function e() {
-            function f() {}
-            function g() {}
-            function h() {}
-            if (window);
-        }
-    }
-}
-
-defun_else_if_return: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
-    input: {
-        function e() {
-            function f() {}
-            if (window) function g() {}
-            else return;
-            function h() {}
-        }
-    }
-    expect: {
-        function e() {
-            function f() {}
-            if (window) function g() {}
-            function h() {}
-        }
-    }
-}

test/compress/issue-1105.js

@@ -1,6 +1,6 @@
 with_in_global_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         var o = 42;
@@ -18,7 +18,7 @@ with_in_global_scope: {
 }
 with_in_function_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function foo() {
@@ -40,7 +40,7 @@ with_in_function_scope: {
 }
 compress_with_with_in_other_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function foo() {
@@ -69,7 +69,7 @@ compress_with_with_in_other_scope: {
 }
 with_using_existing_variable_outside_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function f() {
@@ -99,7 +99,7 @@ with_using_existing_variable_outside_scope: {
 }
 check_drop_unused_in_peer_function: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function outer() {
@@ -148,7 +148,7 @@ check_drop_unused_in_peer_function: {
 
 Infinity_not_in_with_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         var o = { Infinity: 'oInfinity' };
@@ -164,7 +164,7 @@ Infinity_not_in_with_scope: {
 
 Infinity_in_with_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         var o = { Infinity: 'oInfinity' };
@@ -180,19 +180,20 @@ Infinity_in_with_scope: {
 
 assorted_Infinity_NaN_undefined_in_with_scope: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
+        unused:        true,
+        evaluate:      true,
+        dead_code:     true,
+        conditionals:  true,
+        comparisons:   true,
+        booleans:      true,
+        hoist_funs:    true,
+        keep_fargs:    true,
+        if_return:     true,
+        join_vars:     true,
+        cascade:       true,
+        side_effects:  true,
+        sequences:     false,
         keep_infinity: false,
-        sequences: false,
-        side_effects: true,
-        unused: true,
     }
     input: {
         var f = console.log;
@@ -242,19 +243,20 @@ assorted_Infinity_NaN_undefined_in_with_scope: {
 
 assorted_Infinity_NaN_undefined_in_with_scope_keep_infinity: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
+        unused:        true,
+        evaluate:      true,
+        dead_code:     true,
+        conditionals:  true,
+        comparisons:   true,
+        booleans:      true,
+        hoist_funs:    true,
+        keep_fargs:    true,
+        if_return:     true,
+        join_vars:     true,
+        cascade:       true,
+        side_effects:  true,
+        sequences:     false,
         keep_infinity: true,
-        sequences: false,
-        side_effects: true,
-        unused: true,
     }
     input: {
         var f = console.log;

test/compress/issue-12.js

@@ -1,15 +1,11 @@
 keep_name_of_getter: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: { a = { get foo () {} } }
     expect: { a = { get foo () {} } }
 }
 
 keep_name_of_setter: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: { a = { set foo () {} } }
     expect: { a = { set foo () {} } }
 }

test/compress/issue-1202.js

@@ -1,7 +1,7 @@
 mangle_keep_fnames_false: {
     options = {
-        keep_fargs: true,
-        keep_fnames: true,
+        keep_fnames : true,
+        keep_fargs  : true,
     }
     mangle = {
         keep_fnames : false,
@@ -26,8 +26,8 @@ mangle_keep_fnames_false: {
 
 mangle_keep_fnames_true: {
     options = {
-        keep_fargs: true,
-        keep_fnames: true,
+        keep_fnames : true,
+        keep_fargs  : true,
     }
     mangle = {
         keep_fnames : true,

test/compress/issue-1212.js

@@ -0,0 +1,76 @@
+issue_1212_debug_false: {
+    options = {
+        global_defs   : { DEBUG: false },
+        sequences     : true,
+        properties    : true,
+        dead_code     : true,
+        conditionals  : true,
+        comparisons   : true,
+        evaluate      : true,
+        booleans      : true,
+        loops         : true,
+        unused        : true,
+        hoist_funs    : true,
+        keep_fargs    : true,
+        if_return     : true,
+        join_vars     : true,
+        cascade       : true,
+        side_effects  : true,
+    }
+    input: {
+        class foo {
+            bar() {
+                if (DEBUG)
+                    console.log("DEV");
+                else
+                    console.log("PROD");
+            }
+        }
+        new foo().bar();
+    }
+    expect: {
+        class foo{
+            bar() { console.log("PROD") }
+        }
+        (new foo).bar();
+    }
+}
+
+issue_1212_debug_true: {
+    options = {
+        global_defs   : { DEBUG: true },
+        sequences     : true,
+        properties    : true,
+        dead_code     : true,
+        conditionals  : true,
+        comparisons   : true,
+        evaluate      : true,
+        booleans      : true,
+        loops         : true,
+        unused        : true,
+        hoist_funs    : true,
+        keep_fargs    : true,
+        if_return     : true,
+        join_vars     : true,
+        cascade       : true,
+        side_effects  : true,
+    }
+    input: {
+        class foo {
+            bar() {
+                if (DEBUG)
+                    console.log("DEV");
+                else
+                    console.log("PROD");
+            }
+        }
+        new foo().bar();
+    }
+    expect: {
+        class foo{
+            bar() { console.log("DEV") }
+        }
+        (new foo).bar();
+    }
+}
+

test/compress/issue-1261.js

@@ -1,14 +1,15 @@
 pure_function_calls: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        evaluate: true,
-        if_return: true,
-        join_vars: true,
-        negate_iife: true,
-        side_effects: true,
-        unused: true,
+        evaluate     : true,
+        conditionals : true,
+        comparisons  : true,
+        side_effects : true,
+        booleans     : true,
+        unused       : true,
+        if_return    : true,
+        join_vars    : true,
+        cascade      : true,
+        negate_iife  : true,
     }
     input: {
         // pure top-level IIFE will be dropped
@@ -48,28 +49,29 @@ pure_function_calls: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:16,37]",
-        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:16,16]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:14,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:24,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:25,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:17,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:17,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:30,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:30,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:28,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:39,31]",
     ]
 }
 
 pure_function_calls_toplevel: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        evaluate: true,
-        if_return: true,
-        join_vars: true,
-        negate_iife: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
+        evaluate     : true,
+        conditionals : true,
+        comparisons  : true,
+        side_effects : true,
+        booleans     : true,
+        unused       : true,
+        if_return    : true,
+        join_vars    : true,
+        cascade      : true,
+        negate_iife  : true,
+        toplevel     : true,
     }
     input: {
         // pure top-level IIFE will be dropped
@@ -94,13 +96,6 @@ pure_function_calls_toplevel: {
             })();
         })();
 
-        // pure top-level calls will be dropped regardless of the leading comments position
-        var MyClass = /*#__PURE__*//*@class*/(function(){
-            function MyClass() {}
-            MyClass.prototype.method = function() {};
-            return MyClass;
-        })();
-
         // comment #__PURE__ comment
         bar(), baz(), quux();
         a.b(), /* @__PURE__ */ c.d.e(), f.g();
@@ -110,17 +105,15 @@ pure_function_calls_toplevel: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:16,37]",
-        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:16,16]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:14,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:31,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:32,31]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:8,33]",
-        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:8,12]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:24,45]",
-        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:24,12]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:79,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:79,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:92,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:92,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:90,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:100,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:101,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:84,33]",
+        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:84,12]",
     ]
 }
 
@@ -155,29 +148,29 @@ should_warn: {
         baz();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:1,61]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:1,23]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:1,23]",
-        "WARN: Boolean || always true [test/compress/issue-1261.js:2,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:2,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:2,23]",
-        "WARN: Condition left of || always true [test/compress/issue-1261.js:3,8]",
-        "WARN: Condition always true [test/compress/issue-1261.js:3,8]",
-        "WARN: Boolean && always false [test/compress/issue-1261.js:4,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:4,23]",
-        "WARN: Condition always false [test/compress/issue-1261.js:4,23]",
-        "WARN: Condition left of && always false [test/compress/issue-1261.js:5,8]",
-        "WARN: Condition always false [test/compress/issue-1261.js:5,8]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:6,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:6,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:6,23]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:7,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:7,31]",
-        "WARN: Condition always true [test/compress/issue-1261.js:7,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:8,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:9,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:9,24]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:10,31]",
-        "WARN: Condition always false [test/compress/issue-1261.js:10,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:128,61]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:128,23]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:128,23]",
+        "WARN: Boolean || always true [test/compress/issue-1261.js:129,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:129,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:129,23]",
+        "WARN: Condition left of || always true [test/compress/issue-1261.js:130,8]",
+        "WARN: Condition always true [test/compress/issue-1261.js:130,8]",
+        "WARN: Boolean && always false [test/compress/issue-1261.js:131,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:131,23]",
+        "WARN: Condition always false [test/compress/issue-1261.js:131,23]",
+        "WARN: Condition left of && always false [test/compress/issue-1261.js:132,8]",
+        "WARN: Condition always false [test/compress/issue-1261.js:132,8]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:133,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:133,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:133,23]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:134,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:134,31]",
+        "WARN: Condition always true [test/compress/issue-1261.js:134,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:135,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:136,24]",
+        "WARN: Condition always true [test/compress/issue-1261.js:136,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:137,31]",
+        "WARN: Condition always false [test/compress/issue-1261.js:137,8]",
     ]
 }

test/compress/issue-1275.js

@@ -1,16 +1,17 @@
 string_plus_optimization: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        side_effects: true,
-        unused: true,
-    }
+        side_effects  : true,
+        evaluate      : true,
+        conditionals  : true,
+        comparisons   : true,
+        dead_code     : true,
+        booleans      : true,
+        unused        : true,
+        if_return     : true,
+        join_vars     : true,
+        cascade       : true,
+        hoist_funs    : true,
+    };
     input: {
         function foo(anything) {
             function throwing_function() {

test/compress/issue-1321.js

@@ -1,8 +1,6 @@
 issue_1321_no_debug: {
-    mangle = {
-        properties: {
-            keep_quoted: true,
-        },
+    mangle_props = {
+        keep_quoted: true
     }
     input: {
         var x = {};
@@ -12,19 +10,17 @@ issue_1321_no_debug: {
     }
     expect: {
         var x = {};
-        x.x = 1;
-        x["a"] = 2 * x.x;
-        console.log(x.x, x["a"]);
+        x.b = 1;
+        x["a"] = 2 * x.b;
+        console.log(x.b, x["a"]);
     }
     expect_stdout: true
 }
 
 issue_1321_debug: {
-    mangle = {
-        properties: {
-            debug: "",
-            keep_quoted: true,
-        },
+    mangle_props = {
+        keep_quoted: true,
+        debug: ""
     }
     input: {
         var x = {};
@@ -34,18 +30,16 @@ issue_1321_debug: {
     }
     expect: {
         var x = {};
-        x.x = 1;
-        x["_$foo$_"] = 2 * x.x;
-        console.log(x.x, x["_$foo$_"]);
+        x.a = 1;
+        x["_$foo$_"] = 2 * x.a;
+        console.log(x.a, x["_$foo$_"]);
     }
     expect_stdout: true
 }
 
 issue_1321_with_quoted: {
-    mangle = {
-        properties: {
-            keep_quoted: false,
-        },
+    mangle_props = {
+        keep_quoted: false
     }
     input: {
         var x = {};
@@ -55,9 +49,9 @@ issue_1321_with_quoted: {
     }
     expect: {
         var x = {};
-        x.x = 1;
-        x["o"] = 2 * x.x;
-        console.log(x.x, x["o"]);
+        x.a = 1;
+        x["b"] = 2 * x.a;
+        console.log(x.a, x["b"]);
     }
     expect_stdout: true
 }

test/compress/issue-143.js

@@ -15,7 +15,7 @@
 tranformation_sort_order_equal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) == a }
     expect: { (a = parseInt('100')) == a }
@@ -24,7 +24,7 @@ tranformation_sort_order_equal: {
 tranformation_sort_order_unequal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) != a }
     expect: { (a = parseInt('100')) != a }
@@ -33,7 +33,7 @@ tranformation_sort_order_unequal: {
 tranformation_sort_order_lesser_or_equal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) <= a }
     expect: { (a = parseInt('100')) <= a }
@@ -41,7 +41,7 @@ tranformation_sort_order_lesser_or_equal: {
 tranformation_sort_order_greater_or_equal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) >= a }
     expect: { (a = parseInt('100')) >= a }

test/compress/issue-1431.js

@@ -1,6 +1,6 @@
 level_zero: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true
@@ -29,7 +29,7 @@ level_zero: {
 
 level_one: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true
@@ -58,7 +58,7 @@ level_one: {
 
 level_two: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true
@@ -97,7 +97,7 @@ level_two: {
 
 level_three: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true

test/compress/issue-1443.js

@@ -4,7 +4,7 @@ unsafe_undefined: {
     options = {
         conditionals: true,
         if_return: true,
-        unsafe_undefined: true,
+        unsafe: true
     }
     mangle = {}
     input: {
@@ -30,7 +30,7 @@ keep_fnames: {
     options = {
         conditionals: true,
         if_return: true,
-        unsafe_undefined: true,
+        unsafe: true
     }
     mangle = {
         keep_fnames: true

test/compress/issue-1446.js

@@ -1,7 +1,6 @@
 typeof_eq_undefined: {
     options = {
-        comparisons: true,
-        typeofs: true,
+        comparisons: true
     }
     input: {
         var a = typeof b != "undefined";
@@ -25,7 +24,6 @@ typeof_eq_undefined_ie8: {
     options = {
         comparisons: true,
         ie8: true,
-        typeofs: true,
     }
     input: {
         var a = typeof b != "undefined";
@@ -47,8 +45,7 @@ typeof_eq_undefined_ie8: {
 
 undefined_redefined: {
     options = {
-        comparisons: true,
-        typeofs: true,
+        comparisons: true
     }
     input: {
         function f(undefined) {
@@ -61,8 +58,7 @@ undefined_redefined: {
 
 undefined_redefined_mangle: {
     options = {
-        comparisons: true,
-        typeofs: true,
+        comparisons: true
     }
     mangle = {}
     input: {

test/compress/issue-1447.js

@@ -22,17 +22,18 @@ else_with_empty_statement: {
 
 conditional_false_stray_else_in_loop: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: false,
-        dead_code: true,
-        evaluate: true,
-        hoist_vars: true,
-        if_return: true,
-        join_vars: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        evaluate     : true,
+        comparisons  : true,
+        booleans     : true,
+        unused       : true,
+        loops        : true,
+        side_effects : true,
+        dead_code    : true,
+        hoist_vars   : true,
+        join_vars    : true,
+        if_return    : true,
+        cascade      : true,
+        conditionals : false,
     }
     input: {
         for (var i = 1; i <= 4; ++i) {

test/compress/issue-1466.js

@@ -0,0 +1,291 @@
+same_variable_in_multiple_for_loop: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        for (let i = 0; i < 3; i++) {
+            let a = 100;
+            console.log(i, a);
+            for (let i = 0; i < 2; i++) {
+                console.log(i, a);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect: {
+        for (let o = 0; o < 3; o++) {
+            let l = 100;
+            console.log(o, l);
+            for (let o = 0; o < 2; o++) {
+                console.log(o, l);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect_stdout: true
+}
+
+same_variable_in_multiple_forOf: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp of test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let tmp of dd) {
+                console.log(tmp);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o of test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o of e)
+                console.log(o);
+        }
+    }
+    expect_stdout: true
+}
+
+same_variable_in_multiple_forIn: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp in test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let tmp in test) {
+                console.log(tmp);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o in test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o in test)
+                console.log(o);
+        }
+    }
+    expect_stdout: true
+}
+
+different_variable_in_multiple_for_loop: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        for (let i = 0; i < 3; i++) {
+            let a = 100;
+            console.log(i, a);
+            for (let j = 0; j < 2; j++) {
+                console.log(j, a);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect: {
+        for (let o = 0; o < 3; o++) {
+            let l = 100;
+            console.log(o, l);
+            for (let o = 0; o < 2; o++) {
+                console.log(o, l);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect_stdout: true
+}
+
+different_variable_in_multiple_forOf: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp of test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let t of dd) {
+                console.log(t);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o of test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o of e)
+                console.log(o);
+        }
+    }
+    expect_stdout: true
+}
+
+different_variable_in_multiple_forIn: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp in test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let t in test) {
+                console.log(t);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o in test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o in test)
+                console.log(o);
+        }
+    }
+    expect_stdout: true
+}
+
+more_variable_in_multiple_for: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        for (let a = 9, i = 0; i < 20; i += a) {
+            let b = a++ + i;
+            console.log(a, b, i);
+            for (let k = b, m = b*b, i = 0; i < 10; i++) {
+                console.log(a, b, m, k, i);
+            }
+        }
+    }
+    expect: {
+        for (let o = 9, l = 0; l < 20; l += o) {
+            let c = o++ + l;
+            console.log(o, c, l);
+            for (let l = c, e = c * c, f = 0; f < 10; f++)
+                console.log(o, c, e, l, f);
+        }
+    }
+    expect_stdout: true
+}

test/compress/issue-1588.js

@@ -61,7 +61,7 @@ unsafe_undefined: {
     options = {
         conditionals: true,
         if_return: true,
-        unsafe_undefined: true,
+        unsafe: true,
     }
     mangle = {}
     input: {
@@ -85,3 +85,15 @@ unsafe_undefined: {
     }
     expect_stdout: true
 }
+
+runtime_error: {
+    input: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect_stdout: true
+}

test/compress/issue-1609.js

@@ -2,7 +2,6 @@ chained_evaluation_1: {
     options = {
         collapse_vars: true,
         evaluate: true,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -29,7 +28,6 @@ chained_evaluation_2: {
     options = {
         collapse_vars: true,
         evaluate: true,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -52,30 +50,3 @@ chained_evaluation_2: {
         })();
     }
 }
-
-chained_evaluation_3: {
-    options = {
-        collapse_vars: true,
-        evaluate: 10,
-        reduce_funcs: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            var a = "long piece of string";
-            (function() {
-                var b = a, c;
-                c = f(b);
-                c.bar = b;
-            })();
-        })();
-    }
-    expect: {
-        (function() {
-            (function() {
-                f("long piece of string").bar = "long piece of string";
-            })();
-        })();
-    }
-}

test/compress/issue-1639.js

@@ -1,7 +1,8 @@
+
 issue_1639_1: {
     options = {
         booleans: true,
-        collapse_vars: true,
+        cascade: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -11,6 +12,7 @@ issue_1639_1: {
     }
     input: {
         var a = 100, b = 10;
+
         var L1 = 5;
         while (--L1 > 0) {
             if ((--b), false) {
@@ -19,20 +21,21 @@ issue_1639_1: {
                 }
             }
         }
+
         console.log(a, b);
     }
     expect: {
         for (var a = 100, b = 10, L1 = 5; --L1 > 0;)
-            if (--b, 0) var ignore = 0;
+            if (--b, !1) var ignore = 0;
         console.log(a, b);
     }
-    expect_stdout: "100 6"
+    expect_stdout: true
 }
 
 issue_1639_2: {
     options = {
         booleans: true,
-        collapse_vars: true,
+        cascade: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -41,12 +44,14 @@ issue_1639_2: {
     }
     input: {
         var a = 100, b = 10;
+
         function f19() {
             if (++a, false)
                 if (a)
                     if (++a);
         }
         f19();
+
         console.log(a, b);
     }
     expect: {
@@ -57,13 +62,13 @@ issue_1639_2: {
         f19(),
         console.log(a, b);
     }
-    expect_stdout: "101 10"
+    expect_stdout: true
 }
 
 issue_1639_3: {
     options = {
         booleans: true,
-        collapse_vars: true,
+        cascade: true,
         conditionals: true,
         evaluate: true,
         sequences: true,
@@ -79,5 +84,5 @@ issue_1639_3: {
         a++,
         console.log(a, b);
     }
-    expect_stdout: "101 10"
+    expect_stdout: true
 }

test/compress/issue-1656.js

@@ -1,6 +1,7 @@
 f7: {
     options = {
         booleans: true,
+        cascade: true,
         collapse_vars: true,
         comparisons: true,
         conditionals: true,
@@ -14,7 +15,6 @@ f7: {
         negate_iife: true,
         passes: 3,
         properties: true,
-        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -38,7 +38,7 @@ f7: {
         "var b = 10;",
         "",
         "!function() {",
-        "    b = 100;",
+        "    for (;b = 100, !1; ) ;",
         "}(), console.log(100, b);",
     ]
     expect_stdout: true

test/compress/issue-1673.js

@@ -1,6 +1,5 @@
 side_effects_catch: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -35,7 +34,6 @@ side_effects_catch: {
 
 side_effects_else: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -64,7 +62,6 @@ side_effects_else: {
 
 side_effects_finally: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -101,7 +98,6 @@ side_effects_finally: {
 
 side_effects_label: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -134,7 +130,6 @@ side_effects_label: {
 
 side_effects_switch: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,

test/compress/issue-1704.js

@@ -104,7 +104,7 @@ mangle_catch_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var c="FAIL";try{throw 1}catch(o){c="PASS"}console.log(c);'
+    expect_exact: 'var o="FAIL";try{throw 1}catch(c){o="PASS"}console.log(o);'
     expect_stdout: "PASS"
 }
 
@@ -148,7 +148,7 @@ mangle_catch_var_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var r="FAIL";try{throw 1}catch(o){var r="PASS"}console.log(r);'
+    expect_exact: 'var o="FAIL";try{throw 1}catch(r){var o="PASS"}console.log(o);'
     expect_stdout: "PASS"
 }
 
@@ -345,95 +345,3 @@ mangle_catch_redef_2_ie8_toplevel: {
     expect_exact: 'try{throw"FAIL1"}catch(o){var o="FAIL2"}console.log(o);'
     expect_stdout: "undefined"
 }
-
-mangle_catch_redef_3: {
-    mangle = {
-        ie8: false,
-        toplevel: false,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var o="PASS";try{throw 0}catch(o){(function(){function c(){o="FAIL"}c(),c()})()}console.log(o);'
-    expect_stdout: true
-}
-
-mangle_catch_redef_3_toplevel: {
-    mangle = {
-        ie8: false,
-        toplevel: true,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var c="PASS";try{throw 0}catch(c){(function(){function o(){c="FAIL"}o(),o()})()}console.log(c);'
-    expect_stdout: true
-}
-
-mangle_catch_redef_3_ie8: {
-    mangle = {
-        ie8: true,
-        toplevel: false,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var o="PASS";try{throw 0}catch(o){(function(){function c(){o="FAIL"}c(),c()})()}console.log(o);'
-    expect_stdout: true
-}
-
-mangle_catch_redef_3_ie8_toplevel: {
-    mangle = {
-        ie8: true,
-        toplevel: true,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var c="PASS";try{throw 0}catch(c){(function(){function o(){c="FAIL"}o(),o()})()}console.log(c);'
-    expect_stdout: true
-}

test/compress/issue-1733.js

@@ -15,7 +15,7 @@ function_iife_catch: {
         }
         f();
     }
-    expect_exact: "function f(o){!function(){try{throw 0}catch(o){var c=1;console.log(o,c)}}()}f();"
+    expect_exact: "function f(o){!function(){try{throw 0}catch(c){var o=1;console.log(c,o)}}()}f();"
     expect_stdout: "0 1"
 }
 
@@ -36,7 +36,7 @@ function_iife_catch_ie8: {
         }
         f();
     }
-    expect_exact: "function f(c){!function(){try{throw 0}catch(c){var o=1;console.log(c,o)}}()}f();"
+    expect_exact: "function f(o){!function(){try{throw 0}catch(o){var c=1;console.log(o,c)}}()}f();"
     expect_stdout: "0 1"
 }
 
@@ -61,7 +61,7 @@ function_catch_catch: {
         }
         f();
     }
-    expect_exact: "var o=0;function f(){try{throw 1}catch(o){try{throw 2}catch(c){var c=3;console.log(c)}}console.log(c)}f();"
+    expect_exact: "var o=0;function f(){try{throw 1}catch(c){try{throw 2}catch(o){var o=3;console.log(o)}}console.log(o)}f();"
     expect_stdout: [
         "3",
         "undefined",

test/compress/issue-1750.js

@@ -7,7 +7,7 @@ case_1: {
     input: {
         var a = 0, b = 1;
         switch (true) {
-          case a || true:
+          case a, true:
           default:
             b = 2;
           case true:
@@ -17,7 +17,7 @@ case_1: {
     expect: {
         var a = 0, b = 1;
         switch (true) {
-          case a || true:
+          case a, true:
             b = 2;
         }
         console.log(a, b);

test/compress/issue-1770.js

@@ -1,7 +1,5 @@
 mangle_props: {
-    mangle = {
-        properties: true,
-    }
+    mangle_props = {}
     input: {
         var obj = {
             undefined: 1,
@@ -46,7 +44,7 @@ mangle_props: {
             obj[1/0],
             obj["Infinity"],
             obj[-1/0],
-            obj[-(1/0)],
+            obj[-1/0],
             obj["-Infinity"],
             obj[null],
             obj["null"]
@@ -56,12 +54,10 @@ mangle_props: {
 }
 
 numeric_literal: {
-    mangle = {
-        properties: true,
-    }
     beautify = {
         beautify: true,
     }
+    mangle_props = {}
     input: {
         var obj = {
             0: 0,
@@ -84,19 +80,19 @@ numeric_literal: {
         '    0: 0,',
         '    "-0": 1,',
         '    42: 2,',
-        '    42: 3,',
+        '    "42": 3,',
         '    37: 4,',
-        '    o: 5,',
+        '    a: 5,',
         '    1e42: 6,',
         '    b: 7,',
-        '    1e42: 8',
+        '    "1e+42": 8',
         '};',
         '',
         'console.log(obj[-0], obj[-""], obj["-0"]);',
         '',
         'console.log(obj[42], obj["42"]);',
         '',
-        'console.log(obj[37], obj["o"], obj[37], obj["37"]);',
+        'console.log(obj[37], obj["a"], obj[37], obj["37"]);',
         '',
         'console.log(obj[1e42], obj["b"], obj["1e+42"]);',
     ]
@@ -107,139 +103,3 @@ numeric_literal: {
         "8 7 8",
     ]
 }
-
-identifier: {
-    mangle = {
-        properties: true,
-    }
-    input: {
-        var obj = {
-            abstract: 1,
-            boolean: 2,
-            byte: 3,
-            char: 4,
-            class: 5,
-            double: 6,
-            enum: 7,
-            export: 8,
-            extends: 9,
-            final: 10,
-            float: 11,
-            goto: 12,
-            implements: 13,
-            import: 14,
-            int: 15,
-            interface: 16,
-            let: 17,
-            long: 18,
-            native: 19,
-            package: 20,
-            private: 21,
-            protected: 22,
-            public: 23,
-            short: 24,
-            static: 25,
-            super: 26,
-            synchronized: 27,
-            this: 28,
-            throws: 29,
-            transient: 30,
-            volatile: 31,
-            yield: 32,
-            false: 33,
-            null: 34,
-            true: 35,
-            break: 36,
-            case: 37,
-            catch: 38,
-            const: 39,
-            continue: 40,
-            debugger: 41,
-            default: 42,
-            delete: 43,
-            do: 44,
-            else: 45,
-            finally: 46,
-            for: 47,
-            function: 48,
-            if: 49,
-            in: 50,
-            instanceof: 51,
-            new: 52,
-            return: 53,
-            switch: 54,
-            throw: 55,
-            try: 56,
-            typeof: 57,
-            var: 58,
-            void: 59,
-            while: 60,
-            with: 61,
-        };
-    }
-    expect: {
-        var obj = {
-            e: 1,
-            t: 2,
-            n: 3,
-            a: 4,
-            i: 5,
-            o: 6,
-            r: 7,
-            l: 8,
-            s: 9,
-            c: 10,
-            f: 11,
-            u: 12,
-            d: 13,
-            h: 14,
-            p: 15,
-            b: 16,
-            v: 17,
-            w: 18,
-            y: 19,
-            g: 20,
-            m: 21,
-            k: 22,
-            x: 23,
-            j: 24,
-            z: 25,
-            q: 26,
-            A: 27,
-            B: 28,
-            C: 29,
-            D: 30,
-            F: 31,
-            G: 32,
-            false: 33,
-            null: 34,
-            true: 35,
-            H: 36,
-            I: 37,
-            J: 38,
-            K: 39,
-            L: 40,
-            M: 41,
-            N: 42,
-            O: 43,
-            P: 44,
-            Q: 45,
-            R: 46,
-            S: 47,
-            T: 48,
-            U: 49,
-            V: 50,
-            W: 51,
-            X: 52,
-            Y: 53,
-            Z: 54,
-            $: 55,
-            _: 56,
-            ee: 57,
-            te: 58,
-            ne: 59,
-            ae: 60,
-            ie: 61,
-        };
-    }
-}

test/compress/issue-1787.js

@@ -1,8 +1,6 @@
 unary_prefix: {
     options = {
         evaluate: true,
-        inline: true,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }

test/compress/issue-1833.js

@@ -1,7 +1,6 @@
 iife_for: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -27,7 +26,6 @@ iife_for: {
 iife_for_in: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -53,7 +51,6 @@ iife_for_in: {
 iife_do: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -83,7 +80,6 @@ iife_do: {
 iife_while: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -125,8 +121,8 @@ label_do: {
 
 label_while: {
     options = {
-        dead_code: true,
         evaluate: true,
+        dead_code: true,
         loops: true,
     }
     input: {
@@ -134,5 +130,5 @@ label_while: {
             L: while (0) continue L;
         }
     }
-    expect_exact: "function f(){L:0}"
+    expect_exact: "function f(){L:;}"
 }

test/compress/issue-203.js

@@ -0,0 +1,34 @@
+
+compress_new_function: {
+    options = {
+        unsafe: true
+    }
+    input: {
+        new Function("aa, bb", 'return aa;');
+    }
+    expect: {
+        Function("a", "b", "return a");
+    }
+}
+
+compress_new_function_with_destruct: {
+    options = {
+        unsafe: true,
+        ecma: 6
+    }
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        new Function("aa, [bb]", 'return aa;');
+        new Function("aa, {bb}", 'return aa;');
+        new Function("[[aa]], [{bb}]", 'return aa;');
+    }
+    expect: {
+        Function("a", "[b]", "return a");
+        Function("a", "{bb}", "return a");
+        Function("[[a]]", "[{bb}]", 'return a');
+    }
+}
+
+

test/compress/issue-208.js

@@ -1,8 +1,6 @@
 do_not_update_lhs: {
     options = {
-        global_defs: {
-            DEBUG: 0,
-        },
+        global_defs: { DEBUG: 0 }
     }
     input: {
         DEBUG++;
@@ -18,9 +16,7 @@ do_not_update_lhs: {
 
 do_update_rhs: {
     options = {
-        global_defs: {
-            DEBUG: 0,
-        },
+        global_defs: { DEBUG: 0 }
     }
     input: {
         MY_DEBUG = DEBUG;
@@ -39,10 +35,10 @@ mixed: {
             DEBUG: 0,
             ENV: 1,
             FOO: 2,
-        },
+        }
     }
     input: {
-        var ENV = 3;
+        const ENV = 3;
         var FOO = 4;
         f(ENV * 10);
         --FOO;
@@ -53,7 +49,7 @@ mixed: {
         x = DEBUG;
     }
     expect: {
-        var ENV = 3;
+        const ENV = 3;
         var FOO = 4;
         f(10);
         --FOO;
@@ -64,11 +60,11 @@ mixed: {
         x = 0;
     }
     expect_warnings: [
-        "WARN: global_defs ENV redefined [test/compress/issue-208.js:1,12]",
-        "WARN: global_defs FOO redefined [test/compress/issue-208.js:2,12]",
-        "WARN: global_defs FOO redefined [test/compress/issue-208.js:4,10]",
-        "WARN: global_defs DEBUG redefined [test/compress/issue-208.js:5,8]",
-        "WARN: global_defs DEBUG redefined [test/compress/issue-208.js:6,8]",
-        "WARN: global_defs DEBUG redefined [test/compress/issue-208.js:7,8]",
+        'WARN: global_defs ENV redefined [test/compress/issue-208.js:41,14]',
+        'WARN: global_defs FOO redefined [test/compress/issue-208.js:42,12]',
+        'WARN: global_defs FOO redefined [test/compress/issue-208.js:44,10]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:45,8]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:46,8]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:47,8]',
     ]
 }

test/compress/issue-22.js

@@ -1,7 +1,5 @@
 return_with_no_value_in_if_body: {
-    options = {
-        conditionals: true,
-    }
+    options = { conditionals: true };
     input: {
         function foo(bar) {
             if (bar) {

test/compress/issue-2652.js

@@ -1,33 +0,0 @@
-insert_semicolon: {
-    beautify = {
-        beautify: true,
-        comments: "all",
-    }
-    input: {
-        var a
-        /* foo */ var b
-    }
-    expect_exact: [
-        "var a",
-        "/* foo */;",
-        "",
-        "var b;",
-    ]
-}
-
-unary_postfix: {
-    beautify = {
-        beautify: true,
-        comments: "all",
-    }
-    input: {
-        a
-        /* foo */++b
-    }
-    expect_exact: [
-        "a",
-        "/* foo */;",
-        "",
-        "++b;",
-    ]
-}

test/compress/issue-267.js

@@ -1,7 +1,5 @@
 issue_267: {
-    options = {
-        comparisons: true,
-    }
+    options = { comparisons: true };
     input: {
         x = a % b / b * c * 2;
         x = a % b * 2

test/compress/issue-269.js

@@ -1,111 +1,66 @@
 issue_269_1: {
-    options = {
-        unsafe: true,
-    }
-    input: {
-        var x = {};
-        console.log(
-            String(x),
-            Number(x),
-            Boolean(x),
+	options = {unsafe: true};
+	input: {
+		f(
+			String(x),
+			Number(x),
+			Boolean(x),
 
-            String(),
-            Number(),
-            Boolean()
-        );
-    }
-    expect: {
-        var x = {};
-        console.log(
-            x + "", +x, !!x,
-            "", 0, false
-        );
-    }
-    expect_stdout: true
+			String(),
+			Number(),
+			Boolean()
+		);
+	}
+	expect: {
+		f(
+			x + '', +x, !!x,
+			'', 0, false
+		);
+	}
 }
 
 issue_269_dangers: {
-    options = {
-        unsafe: true,
-    }
-    input: {
-        var x = {};
-        console.log(
-            String(x, x),
-            Number(x, x),
-            Boolean(x, x)
-        );
-    }
-    expect: {
-        var x = {};
-        console.log(String(x, x), Number(x, x), Boolean(x, x));
-    }
-    expect_stdout: true
+	options = {unsafe: true};
+	input: {
+		f(
+			String(x, x),
+			Number(x, x),
+			Boolean(x, x)
+		);
+	}
+	expect: {
+		f(String(x, x), Number(x, x), Boolean(x, x));
+	}
 }
 
 issue_269_in_scope: {
-    options = {
-        unsafe: true,
-    }
-    input: {
-        var String, Number, Boolean;
-        var x = {};
-        console.log(
-            String(x),
-            Number(x, x),
-            Boolean(x)
-        );
-    }
-    expect: {
-        var String, Number, Boolean;
-        var x = {};
-        console.log(String(x), Number(x, x), Boolean(x));
-    }
-    expect_stdout: true
+	options = {unsafe: true};
+	input: {
+		var String, Number, Boolean;
+		f(
+			String(x),
+			Number(x, x),
+			Boolean(x)
+		);
+	}
+	expect: {
+		var String, Number, Boolean;
+		f(String(x), Number(x, x), Boolean(x));
+	}
 }
 
 strings_concat: {
-    options = {
-        strings: true,
-        unsafe: true,
-    }
-    input: {
-        var x = {};
-        console.log(
-            String(x + "str"),
-            String("str" + x)
-        );
-    }
-    expect: {
-        var x = {};
-        console.log(
-            x + "str",
-            "str" + x
-        );
-    }
-    expect_stdout: true
-}
-
-regexp: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        RegExp("foo");
-        RegExp("bar", "ig");
-        RegExp(foo);
-        RegExp("bar", ig);
-        RegExp("should", "fail");
-    }
-    expect: {
-        /foo/;
-        /bar/ig;
-        RegExp(foo);
-        RegExp("bar", ig);
-        RegExp("should", "fail");
-    }
-    expect_warnings: [
-        'WARN: Error converting RegExp("should","fail") [test/compress/issue-269.js:5,8]',
-    ]
+	options = {unsafe: true};
+	input: {
+		f(
+			String(x + 'str'),
+			String('str' + x)
+		);
+	}
+	expect: {
+		f(
+			x + 'str',
+			'str' + x
+		);
+	}
 }

test/compress/issue-2719.js

@@ -1,32 +0,0 @@
-warn: {
-    options = {
-        evaluate: true,
-        inline: true,
-        passes: 2,
-        properties: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            return g();
-        }
-        function g() {
-            return g["call" + "er"].arguments;
-        }
-        // 3
-        console.log(f(1, 2, 3).length);
-    }
-    expect: {
-        // TypeError: Cannot read property 'arguments' of null
-        console.log(function g() {
-            return g.caller.arguments;
-        }().length);
-    }
-    expect_warnings: [
-        "WARN: Function.prototype.arguments not supported [test/compress/issue-2719.js:5,19]",
-        "WARN: Function.prototype.caller not supported [test/compress/issue-2719.js:5,19]",
-    ]
-}

test/compress/issue-281.js

@@ -1,498 +0,0 @@
-collapse_vars_constants: {
-    options = {
-        collapse_vars: true,
-        evaluate: true,
-        inline: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        function f1(x) {
-            var a = 4, b = x.prop, c = 5, d = sideeffect1(), e = sideeffect2();
-            return b + (function() { return d - a * e - c; })();
-        }
-        function f2(x) {
-            var a = 4, b = x.prop, c = 5, not_used = sideeffect1(), e = sideeffect2();
-            return b + (function() { return -a * e - c; })();
-        }
-    }
-    expect: {
-        function f1(x) {
-            var b = x.prop, d = sideeffect1(), e = sideeffect2();
-            return b + (d - 4 * e - 5);
-        }
-        function f2(x) {
-            var b = x.prop;
-            sideeffect1();
-            return b + (-4 * sideeffect2() - 5);
-        }
-    }
-}
-
-modified: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        unused: true,
-    }
-    input: {
-        function f5(b) {
-            var a = function() {
-                return b;
-            }();
-            return b++ + a;
-        }
-        console.log(f5(1));
-    }
-    expect: {
-        function f5(b) {
-            var a = b;
-            return b++ + a;
-        }
-        console.log(f5(1));
-    }
-    expect_stdout: "2"
-}
-
-ref_scope: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        unused: true,
-    }
-    input: {
-        console.log(function() {
-            var a = 1, b = 2, c = 3;
-            var a = c++, b = b /= a;
-            return function() {
-                return a;
-            }() + b;
-        }());
-    }
-    expect: {
-        console.log(function() {
-            var a = 1, b = 2, c = 3;
-            b = b /= a = c++;
-            return a + b;
-        }());
-    }
-    expect_stdout: true
-}
-
-safe_undefined: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        inline: true,
-        unsafe: false,
-        unused: true,
-    }
-    mangle = {}
-    input: {
-        var a, c;
-        console.log(function(undefined) {
-            return function() {
-                if (a)
-                    return b;
-                if (c)
-                    return d;
-            };
-        }(1)());
-    }
-    expect: {
-        var a, c;
-        console.log(a ? b : c ? d : void 0);
-    }
-    expect_stdout: true
-}
-
-negate_iife_3: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: true,
-    }
-    input: {
-        (function(){ return t })() ? console.log(true) : console.log(false);
-    }
-    expect: {
-        t ? console.log(true) : console.log(false);
-    }
-}
-
-negate_iife_3_off: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: false,
-    }
-    input: {
-        (function(){ return t })() ? console.log(true) : console.log(false);
-    }
-    expect: {
-        t ? console.log(true) : console.log(false);
-    }
-}
-
-negate_iife_4: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: true,
-        sequences: true,
-    }
-    input: {
-        (function(){ return t })() ? console.log(true) : console.log(false);
-        (function(){
-            console.log("something");
-        })();
-    }
-    expect: {
-        t ? console.log(true) : console.log(false), void console.log("something");
-    }
-}
-
-negate_iife_5: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: true,
-        sequences: true,
-    }
-    input: {
-        if ((function(){ return t })()) {
-            foo(true);
-        } else {
-            bar(false);
-        }
-        (function(){
-            console.log("something");
-        })();
-    }
-    expect: {
-        t ? foo(true) : bar(false), void console.log("something");
-    }
-}
-
-negate_iife_5_off: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: false,
-        sequences: true,
-    }
-    input: {
-        if ((function(){ return t })()) {
-            foo(true);
-        } else {
-            bar(false);
-        }
-        (function(){
-            console.log("something");
-        })();
-    }
-    expect: {
-        t ? foo(true) : bar(false), void console.log("something");
-    }
-}
-
-issue_1254_negate_iife_true: {
-    options = {
-        expression: true,
-        inline: true,
-        negate_iife: true,
-    }
-    input: {
-        (function() {
-            return function() {
-                console.log('test')
-            };
-        })()();
-    }
-    expect_exact: 'void console.log("test");'
-    expect_stdout: true
-}
-
-issue_1254_negate_iife_nested: {
-    options = {
-        expression: true,
-        inline: true,
-        negate_iife: true,
-    }
-    input: {
-        (function() {
-            return function() {
-                console.log('test')
-            };
-        })()()()()();
-    }
-    expect_exact: '(void console.log("test"))()()();'
-}
-
-negate_iife_issue_1073: {
-    options = {
-        conditionals: true,
-        evaluate: true,
-        inline: true,
-        negate_iife: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        sequences: true,
-        unused: true,
-    }
-    input: {
-        new (function(a) {
-            return function Foo() {
-                this.x = a;
-                console.log(this);
-            };
-        }(7))();
-    }
-    expect: {
-        new function() {
-            this.x = 7,
-            console.log(this);
-        }();
-    }
-    expect_stdout: true
-}
-
-issue_1288_side_effects: {
-    options = {
-        conditionals: true,
-        evaluate: true,
-        inline: true,
-        negate_iife: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        if (w) ;
-        else {
-            (function f() {})();
-        }
-        if (!x) {
-            (function() {
-                x = {};
-            })();
-        }
-        if (y)
-            (function() {})();
-        else
-            (function(z) {
-                return z;
-            })(0);
-    }
-    expect: {
-        w;
-        x || (x = {});
-        y;
-    }
-}
-
-inner_var_for_in_1: {
-    options = {
-        evaluate: true,
-        inline: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-    }
-    input: {
-        function f() {
-            var a = 1, b = 2;
-            for (b in (function() {
-                return x(a, b, c);
-            })()) {
-                var c = 3, d = 4;
-                x(a, b, c, d);
-            }
-            x(a, b, c, d);
-        }
-    }
-    expect: {
-        function f() {
-            var a = 1, b = 2;
-            for (b in x(1, b, c)) {
-                var c = 3, d = 4;
-                x(1, b, c, d);
-            }
-            x(1, b, c, d);
-        }
-    }
-}
-
-issue_1595_3: {
-    options = {
-        evaluate: true,
-        inline: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function f(a) {
-            return g(a + 1);
-        })(2);
-    }
-    expect: {
-        g(3);
-    }
-}
-
-issue_1758: {
-    options = {
-        inline: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(function(c) {
-            var undefined = 42;
-            return function() {
-                c--;
-                c--, c.toString();
-                return;
-            }();
-        }());
-    }
-    expect: {
-        console.log(function(c) {
-            var undefined = 42;
-            return c--, c--, void c.toString();
-        }());
-    }
-    expect_stdout: "undefined"
-}
-wrap_iife: {
-    options = {
-        inline: true,
-        negate_iife: false,
-    }
-    beautify = {
-        wrap_iife: true,
-    }
-    input: {
-        (function() {
-            return function() {
-                console.log('test')
-            };
-        })()();
-    }
-    expect_exact: 'void console.log("test");'
-}
-
-wrap_iife_in_expression: {
-    options = {
-        inline: true,
-        negate_iife: false,
-    }
-    beautify = {
-        wrap_iife: true,
-    }
-    input: {
-        foo = (function() {
-            return bar();
-        })();
-    }
-    expect_exact: 'foo=bar();'
-}
-
-wrap_iife_in_return_call: {
-    options = {
-        inline: true,
-        negate_iife: false,
-    }
-    beautify = {
-        wrap_iife: true,
-    }
-    input: {
-        (function() {
-            return (function() {
-                console.log('test')
-            })();
-        })()();
-    }
-    expect_exact: '(void console.log("test"))();'
-}
-
-pure_annotation_1: {
-    options = {
-        inline: true,
-        side_effects: true,
-    }
-    input: {
-        /*@__PURE__*/(function() {
-            console.log("hello");
-        }());
-    }
-    expect_exact: ""
-}
-
-pure_annotation_2: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        side_effects: true,
-    }
-    input: {
-        /*@__PURE__*/(function(n) {
-            console.log("hello", n);
-        }(42));
-    }
-    expect_exact: ""
-}
-
-drop_fargs: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        keep_fargs: false,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a = 1;
-        !function(a_1) {
-            a++;
-        }(a++ + (a && a.var));
-        console.log(a);
-    }
-    expect: {
-        var a = 1;
-        ++a && a.var, a++;
-        console.log(a);
-    }
-    expect_stdout: "3"
-}
-
-keep_fargs: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        keep_fargs: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a = 1;
-        !function(a_1) {
-            a++;
-        }(a++ + (a && a.var));
-        console.log(a);
-    }
-    expect: {
-        var a = 1;
-        ++a && a.var, a++;
-        console.log(a);
-    }
-    expect_stdout: "3"
-}

test/compress/issue-2871.js

@@ -1,37 +0,0 @@
-comparison_with_undefined: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        a == undefined;
-        a != undefined;
-        a === undefined;
-        a !== undefined;
-
-        undefined == a;
-        undefined != a;
-        undefined === a;
-        undefined !== a;
-
-        void 0 == a;
-        void 0 != a;
-        void 0 === a;
-        void 0 !== a;
-    }
-    expect: {
-        null == a;
-        null != a;
-        void 0 === a;
-        void 0 !== a;
-
-        null == a;
-        null != a;
-        void 0 === a;
-        void 0 !== a;
-
-        null == a;
-        null != a;
-        void 0 === a;
-        void 0 !== a;
-    }
-}

test/compress/issue-2989.js

@@ -1,21 +0,0 @@
-inline_script_off: {
-    beautify = {
-        inline_script: false,
-    }
-    input: {
-        console.log("</sCrIpT>");
-    }
-    expect_exact: 'console.log("</sCrIpT>");'
-    expect_stdout: "</sCrIpT>"
-}
-
-inline_script_on: {
-    beautify = {
-        inline_script: true,
-    }
-    input: {
-        console.log("</sCrIpT>");
-    }
-    expect_exact: 'console.log("<\\/sCrIpT>");'
-    expect_stdout: "</sCrIpT>"
-}

test/compress/issue-368.js

@@ -1,6 +1,6 @@
 collapse: {
     options = {
-        collapse_vars: true,
+        cascade: true,
         sequences: true,
         side_effects: true,
         unused: true,
@@ -41,7 +41,7 @@ collapse: {
             return void 0 !== ('function' === typeof b ? b() : b) && c();
         }
         function f2(b) {
-            return 'stirng' == typeof ('function' === typeof (b = c()) ? b() : b) && d();
+            return b = c(), 'stirng' == typeof ('function' === typeof b ? b() : b) && d();
         }
         function f3(c) {
             var a;

test/compress/issue-3768.js

@@ -1,128 +0,0 @@
-mangle: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var e = eval, x = 42;
-        (function() {
-            console.log(e("typeof x"));
-        })();
-    }
-    expect: {
-        var e = eval, x = 42;
-        (function() {
-            console.log(e("typeof x"));
-        })();
-    }
-    expect_stdout: true
-}
-
-compress: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        unused: true,
-    }
-    input: {
-        console.log(function() {
-            var a = 42;
-            return eval("typeof a");
-        }(), function(e) {
-            var a = null;
-            return e("typeof a");
-        }(eval), function(eval) {
-            var a = false;
-            return eval("typeof a");
-        }(eval), function(f) {
-            var a = "STRING";
-            var eval = f;
-            return eval("typeof a");
-        }(eval), function(g) {
-            var a = eval;
-            function eval() {
-                return g;
-            }
-            return eval()("typeof a");
-        }(eval));
-    }
-    expect: {
-        console.log(function() {
-            var a = 42;
-            return eval("typeof a");
-        }(), (0, eval)("typeof a"), function(eval) {
-            var a = false;
-            return eval("typeof a");
-        }(eval), function(f) {
-            var a = "STRING";
-            var eval = f;
-            return eval("typeof a");
-        }(eval), function(g) {
-            var a = eval;
-            function eval() {
-                return g;
-            }
-            return eval()("typeof a");
-        }(eval));
-    }
-    expect_stdout: "number undefined boolean string undefined"
-}
-
-call_arg_1: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var z = "foo";
-        (function() {
-            var z = false;
-            (function(e) {
-                var z = 42;
-                e("console.log(typeof z)");
-            })(eval);
-        })();
-    }
-    expect: {
-        var z = "foo";
-        (function() {
-            var o = false;
-            (function(o) {
-                var a = 42;
-                o("console.log(typeof z)");
-            })(eval);
-        })();
-    }
-    expect_stdout: true
-}
-
-call_arg_2: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        function eval() {
-            console.log("PASS");
-        }
-        var z = "foo";
-        (function() {
-            var z = false;
-            (function(e) {
-                var z = 42;
-                e("console.log(typeof z)");
-            })(eval);
-        })();
-    }
-    expect: {
-        function n() {
-            console.log("PASS");
-        }
-        var o = "foo";
-        (function() {
-            var o = false;
-            (function(o) {
-                var n = 42;
-                o("console.log(typeof z)");
-            })(n);
-        })();
-    }
-    expect_stdout: "PASS"
-}

test/compress/issue-44.js

@@ -1,7 +1,5 @@
 issue_44_valid_ast_1: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: {
         function a(b) {
             for (var i = 0, e = b.qoo(); ; i++) {}
@@ -16,9 +14,7 @@ issue_44_valid_ast_1: {
 }
 
 issue_44_valid_ast_2: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: {
         function a(b) {
             if (foo) for (var i = 0, e = b.qoo(); ; i++) {}

test/compress/issue-59.js

@@ -1,8 +1,8 @@
 keep_continue: {
     options = {
         dead_code: true,
-        evaluate: true,
-    }
+        evaluate: true
+    };
     input: {
         while (a) {
             if (b) {

test/compress/issue-597.js

@@ -1,5 +1,5 @@
 NaN_and_Infinity_must_have_parens: {
-    options = {}
+    options = {};
     input: {
         Infinity.toString();
         NaN.toString();
@@ -11,7 +11,7 @@ NaN_and_Infinity_must_have_parens: {
 }
 
 NaN_and_Infinity_should_not_be_replaced_when_they_are_redefined: {
-    options = {}
+    options = {};
     input: {
         var Infinity, NaN;
         Infinity.toString();