support string namespace in import & export (#5570)

lib/ast.js

@@ -1366,34 +1366,29 @@ var AST_ExportDefault = DEFNODE("ExportDefault", "body", {
     },
 }, AST_Statement);
 
-var AST_ExportForeign = DEFNODE("ExportForeign", "aliases keys path quote", {
+var AST_ExportForeign = DEFNODE("ExportForeign", "aliases keys path", {
     $documentation: "An `export ... from '...'` statement",
     $propdoc: {
-        aliases: "[string*] array of aliases to export",
+        aliases: "[AST_String*] array of aliases to export",
-        keys: "[string*] array of keys to import",
+        keys: "[AST_String*] array of keys to import",
-        path: "[string] the path to import module",
+        path: "[AST_String] the path to import module",
-        quote: "[string?] the original quote character",
     },
     _equals: function(node) {
-        return this.path == node.path
+        return this.path.equals(node.path)
-            && list_equals(this.aliases, node.aliases)
+            && all_equals(this.aliases, node.aliases)
-            && list_equals(this.keys, node.keys);
+            && all_equals(this.keys, node.keys);
     },
     _validate: function() {
         if (this.aliases.length != this.keys.length) {
             throw new Error("aliases:key length mismatch: " + this.aliases.length + " != " + this.keys.length);
         }
         this.aliases.forEach(function(name) {
-            if (typeof name != "string") throw new Error("aliases must contain string");
+            if (!(name instanceof AST_String)) throw new Error("aliases must contain AST_String");
         });
         this.keys.forEach(function(name) {
-            if (typeof name != "string") throw new Error("keys must contain string");
+            if (!(name instanceof AST_String)) throw new Error("keys must contain AST_String");
         });
-        if (typeof this.path != "string") throw new Error("path must be string");
+        if (!(this.path instanceof AST_String)) throw new Error("path must be AST_String");
-        if (this.quote != null) {
-            if (typeof this.quote != "string") throw new Error("quote must be string");
-            if (!/^["']$/.test(this.quote)) throw new Error("invalid quote: " + this.quote);
-        }
     },
 }, AST_Statement);
 
@@ -1420,17 +1415,16 @@ var AST_ExportReferences = DEFNODE("ExportReferences", "properties", {
     },
 }, AST_Statement);
 
-var AST_Import = DEFNODE("Import", "all default path properties quote", {
+var AST_Import = DEFNODE("Import", "all default path properties", {
     $documentation: "An `import` statement",
     $propdoc: {
         all: "[AST_SymbolImport?] the imported namespace, or null if not specified",
         default: "[AST_SymbolImport?] the alias for default `export`, or null if not specified",
-        path: "[string] the path to import module",
+        path: "[AST_String] the path to import module",
         properties: "[(AST_SymbolImport*)?] array of aliases, or null if not specified",
-        quote: "[string?] the original quote character",
     },
     _equals: function(node) {
-        return this.path == node.path
+        return this.path.equals(node.path)
             && prop_equals(this.all, node.all)
             && prop_equals(this.default, node.default)
             && !this.properties == !node.properties
@@ -1453,16 +1447,12 @@ var AST_Import = DEFNODE("Import", "all default path properties quote", {
         }
         if (this.default != null) {
             if (!(this.default instanceof AST_SymbolImport)) throw new Error("default must be AST_SymbolImport");
-            if (this.default.key !== "") throw new Error("invalid default key: " + this.default.key);
+            if (this.default.key.value !== "") throw new Error("invalid default key: " + this.default.key.value);
         }
-        if (typeof this.path != "string") throw new Error("path must be string");
+        if (!(this.path instanceof AST_String)) throw new Error("path must be AST_String");
         if (this.properties != null) this.properties.forEach(function(node) {
             if (!(node instanceof AST_SymbolImport)) throw new Error("properties must contain AST_SymbolImport");
         });
-        if (this.quote != null) {
-            if (typeof this.quote != "string") throw new Error("quote must be string");
-            if (!/^["']$/.test(this.quote)) throw new Error("invalid quote: " + this.quote);
-        }
     },
 }, AST_Statement);
 
@@ -2005,14 +1995,14 @@ var AST_SymbolConst = DEFNODE("SymbolConst", null, {
 var AST_SymbolImport = DEFNODE("SymbolImport", "key", {
     $documentation: "Symbol defined by an `import` statement",
     $propdoc: {
-        key: "[string] the original `export` name",
+        key: "[AST_String] the original `export` name",
     },
     _equals: function(node) {
         return this.name == node.name
-            && this.key == node.key;
+            && this.key.equals(node.key);
     },
     _validate: function() {
-        if (typeof this.key != "string") throw new Error("key must be string");
+        if (!(this.key instanceof AST_String)) throw new Error("key must be AST_String");
     },
 }, AST_SymbolConst);
 
@@ -2066,14 +2056,14 @@ var AST_SymbolRef = DEFNODE("SymbolRef", "fixed in_arg redef", {
 var AST_SymbolExport = DEFNODE("SymbolExport", "alias", {
     $documentation: "Reference in an `export` statement",
     $propdoc: {
-        alias: "[string] the `export` alias",
+        alias: "[AST_String] the `export` alias",
     },
     _equals: function(node) {
         return this.name == node.name
-            && this.alias == node.alias;
+            && this.alias.equals(node.alias);
     },
     _validate: function() {
-        if (typeof this.alias != "string") throw new Error("alias must be string");
+        if (!(this.alias instanceof AST_String)) throw new Error("alias must be AST_String");
     },
 }, AST_SymbolRef);
 

lib/compress.js

@@ -294,7 +294,7 @@ Compressor.prototype.compress = function(node) {
         function export_symbol(sym) {
             if (!(sym instanceof AST_SymbolDeclaration)) return;
             var node = make_node(AST_SymbolExport, sym, sym);
-            node.alias = node.name;
+            node.alias = make_node(AST_String, node, { value: node.name });
             props.push(node);
         }
     });

lib/mozilla-ast.js

@@ -316,13 +316,22 @@
             });
         },
         ExportAllDeclaration: function(M) {
-            var alias = M.exported ? read_name(M.exported) : "*";
+            var start = my_start_token(M);
+            var end = my_end_token(M);
             return new AST_ExportForeign({
-                start: my_start_token(M),
+                start: start,
-                end: my_end_token(M),
+                end: end,
-                aliases: [ alias ],
+                aliases: [ M.exported ? from_moz_alias(M.exported) : new AST_String({
-                keys: [ "*" ],
+                    start: start,
-                path: M.source.value,
+                    value: "*",
+                    end: end,
+                }) ],
+                keys: [ new AST_String({
+                    start: start,
+                    value: "*",
+                    end: end,
+                }) ],
+                path: from_moz(M.source),
             });
         },
         ExportDefaultDeclaration: function(M) {
@@ -359,15 +368,15 @@
             if (M.source) {
                 var aliases = [], keys = [];
                 M.specifiers.forEach(function(prop) {
-                    aliases.push(read_name(prop.exported));
+                    aliases.push(from_moz_alias(prop.exported));
-                    keys.push(read_name(prop.local));
+                    keys.push(from_moz_alias(prop.local));
                 });
                 return new AST_ExportForeign({
                     start: my_start_token(M),
                     end: my_end_token(M),
                     aliases: aliases,
                     keys: keys,
-                    path: M.source.value,
+                    path: from_moz(M.source),
                 });
             }
             return new AST_ExportReferences({
@@ -375,38 +384,48 @@
                 end: my_end_token(M),
                 properties: M.specifiers.map(function(prop) {
                     var sym = new AST_SymbolExport(from_moz(prop.local));
-                    sym.alias = read_name(prop.exported);
+                    sym.alias = from_moz_alias(prop.exported);
                     return sym;
                 }),
             });
         },
         ImportDeclaration: function(M) {
+            var start = my_start_token(M);
+            var end = my_end_token(M);
             var all = null, def = null, props = null;
             M.specifiers.forEach(function(prop) {
                 var sym = new AST_SymbolImport(from_moz(prop.local));
                 switch (prop.type) {
                   case "ImportDefaultSpecifier":
                     def = sym;
-                    def.key = "";
+                    def.key = new AST_String({
+                        start: start,
+                        value: "",
+                        end: end,
+                    });
                     break;
                   case "ImportNamespaceSpecifier":
                     all = sym;
-                    all.key = "*";
+                    all.key = new AST_String({
+                        start: start,
+                        value: "*",
+                        end: end,
+                    });
                     break;
                   default:
-                    sym.key = prop.imported.name || syn.name;
+                    sym.key = from_moz_alias(prop.imported);
                     if (!props) props = [];
                     props.push(sym);
                     break;
                 }
             });
             return new AST_Import({
-                start: my_start_token(M),
+                start: start,
-                end: my_end_token(M),
+                end: end,
                 all: all,
                 default: def,
                 properties: props,
-                path: M.source.value,
+                path: from_moz(M.source),
             });
         },
         ImportExpression: function(M) {
@@ -797,38 +816,26 @@
     });
 
     def_to_moz(AST_ExportForeign, function To_Moz_ExportAllDeclaration_ExportNamedDeclaration(M) {
-        if (M.keys[0] == "*") return {
+        if (M.keys[0].value == "*") return {
             type: "ExportAllDeclaration",
-            exported: M.aliases[0] == "*" ? null : {
+            exported: M.aliases[0].value == "*" ? null : to_moz_alias(M.aliases[0]),
-                type: "Identifier",
+            source: to_moz(M.path),
-                name: M.aliases[0],
-            },
-            source: {
-                type: "Literal",
-                value: M.path,
-            },
         };
         var specifiers = [];
         for (var i = 0; i < M.aliases.length; i++) {
-            specifiers.push({
+            specifiers.push(set_moz_loc({
+                start: M.keys[i].start,
+                end: M.aliases[i].end,
+            }, {
                 type: "ExportSpecifier",
-                exported: {
+                local: to_moz_alias(M.keys[i]),
-                    type: "Identifier",
+                exported: to_moz_alias(M.aliases[i]),
-                    name: M.aliases[i],
+            }));
-                },
-                local: {
-                    type: "Identifier",
-                    name: M.keys[i],
-                },
-            });
         }
         return {
             type: "ExportNamedDeclaration",
             specifiers: specifiers,
-            source: {
+            source: to_moz(M.path),
-                type: "Literal",
-                value: M.path,
-            },
         };
     });
 
@@ -836,44 +843,41 @@
         return {
             type: "ExportNamedDeclaration",
             specifiers: M.properties.map(function(prop) {
-                return {
+                return set_moz_loc({
+                    start: prop.start,
+                    end: prop.alias.end,
+                }, {
                     type: "ExportSpecifier",
                     local: to_moz(prop),
-                    exported: {
+                    exported: to_moz_alias(prop.alias),
-                        type: "Identifier",
+                });
-                        name: prop.alias,
-                    },
-                };
             }),
         };
     });
 
     def_to_moz(AST_Import, function To_Moz_ImportDeclaration(M) {
         var specifiers = M.properties ? M.properties.map(function(prop) {
-            return {
+            return set_moz_loc({
+                start: prop.key.start,
+                end: prop.end,
+            }, {
                 type: "ImportSpecifier",
                 local: to_moz(prop),
-                imported: {
+                imported: to_moz_alias(prop.key),
-                    type: "Identifier",
+            });
-                    name: prop.key,
-                },
-            };
         }) : [];
-        if (M.all) specifiers.unshift({
+        if (M.all) specifiers.unshift(set_moz_loc(M.all, {
             type: "ImportNamespaceSpecifier",
             local: to_moz(M.all),
-        });
+        }));
-        if (M.default) specifiers.unshift({
+        if (M.default) specifiers.unshift(set_moz_loc(M.default, {
             type: "ImportDefaultSpecifier",
             local: to_moz(M.default),
-        });
+        }));
         return {
             type: "ImportDeclaration",
             specifiers: specifiers,
-            source: {
+            source: to_moz(M.path),
-                type: "Literal",
-                value: M.path,
-            },
         };
     });
 
@@ -1220,6 +1224,14 @@
         return node;
     }
 
+    function from_moz_alias(moz) {
+        return new AST_String({
+            start: my_start_token(moz),
+            value: read_name(moz),
+            end: my_end_token(moz),
+        });
+    }
+
     AST_Node.from_mozilla_ast = function(node) {
         var save_stack = FROM_MOZ_STACK;
         FROM_MOZ_STACK = [];
@@ -1271,6 +1283,13 @@
         return node != null ? node.to_mozilla_ast() : null;
     }
 
+    function to_moz_alias(alias) {
+        return is_identifier_string(alias.value) ? set_moz_loc(alias, {
+            type: "Identifier",
+            name: alias.value,
+        }) : to_moz(alias);
+    }
+
     function to_moz_block(node) {
         return {
             type: "BlockStatement",

lib/output.js

@@ -1061,6 +1061,14 @@ function OutputStream(options) {
         }
         output.semicolon();
     });
+    function print_alias(alias, output) {
+        var value = alias.value;
+        if (value == "*" || is_identifier_string(value)) {
+            output.print_name(value);
+        } else {
+            output.print_string(value, alias.quote);
+        }
+    }
     DEFPRINT(AST_ExportForeign, function(output) {
         var self = this;
         output.print("export");
@@ -1068,7 +1076,7 @@ function OutputStream(options) {
         var len = self.keys.length;
         if (len == 0) {
             print_braced_empty(self, output);
-        } else if (self.keys[0] == "*") {
+        } else if (self.keys[0].value == "*") {
             print_entry(0);
         } else output.with_block(function() {
             output.indent();
@@ -1084,18 +1092,18 @@ function OutputStream(options) {
         output.space();
         output.print("from");
         output.space();
-        output.print_string(self.path, self.quote);
+        self.path.print(output);
         output.semicolon();
 
         function print_entry(index) {
             var alias = self.aliases[index];
             var key = self.keys[index];
-            output.print_name(key);
+            print_alias(key, output);
-            if (alias != key) {
+            if (alias.value != key.value) {
                 output.space();
                 output.print("as");
                 output.space();
-                output.print_name(alias);
+                print_alias(alias, output);
             }
         }
     });
@@ -1124,7 +1132,7 @@ function OutputStream(options) {
             output.print("from");
             output.space();
         }
-        output.print_string(self.path, self.quote);
+        self.path.print(output);
         output.semicolon();
     });
 
@@ -1734,19 +1742,19 @@ function OutputStream(options) {
         var name = get_symbol_name(self);
         output.print_name(name);
         var alias = self.alias;
-        if (alias != name) {
+        if (alias.value != name) {
             output.space();
             output.print("as");
             output.space();
-            output.print_name(alias);
+            print_alias(alias, output);
         }
     });
     DEFPRINT(AST_SymbolImport, function(output) {
         var self = this;
         var name = get_symbol_name(self);
         var key = self.key;
-        if (key && key != name) {
+        if (key.value && key.value != name) {
-            output.print_name(key);
+            print_alias(key, output);
             output.space();
             output.print("as");
             output.space();

lib/parse.js

@@ -1442,28 +1442,41 @@ function parse($TEXT, options) {
     }
 
     function is_alias() {
-        return is("name") || is_identifier_string(S.token.value);
+        return is("name") || is("string") || is_identifier_string(S.token.value);
+    }
+
+    function make_string(token) {
+        return new AST_String({
+            start: token,
+            quote: token.quote,
+            value: token.value,
+            end: token,
+        });
+    }
+
+    function as_path() {
+        var path = S.token;
+        expect_token("string");
+        semicolon();
+        return make_string(path);
     }
 
     function export_() {
         if (is("operator", "*")) {
+            var key = S.token;
+            var alias = key;
             next();
-            var alias = "*";
             if (is("name", "as")) {
                 next();
                 if (!is_alias()) expect_token("name");
-                alias = S.token.value;
+                alias = S.token;
                 next();
             }
             expect_token("name", "from");
-            var path = S.token;
-            expect_token("string");
-            semicolon();
             return new AST_ExportForeign({
-                aliases: [ alias ],
+                aliases: [ make_string(alias) ],
-                keys: [ "*" ],
+                keys: [ make_string(key) ],
-                path: path.value,
+                path: as_path(),
-                quote: path.quote,
             });
         }
         if (is("punc", "{")) {
@@ -1477,26 +1490,20 @@ function parse($TEXT, options) {
                 if (is("name", "as")) {
                     next();
                     if (!is_alias()) expect_token("name");
-                    aliases.push(S.token.value);
+                    aliases.push(S.token);
                     next();
                 } else {
-                    aliases.push(key.value);
+                    aliases.push(key);
                 }
                 if (!is("punc", "}")) expect(",");
             }
             expect("}");
             if (is("name", "from")) {
                 next();
-                var path = S.token;
-                expect_token("string");
-                semicolon();
                 return new AST_ExportForeign({
-                    aliases: aliases,
+                    aliases: aliases.map(make_string),
-                    keys: keys.map(function(token) {
+                    keys: keys.map(make_string),
-                        return token.value;
+                    path: as_path(),
-                    }),
-                    path: path.value,
-                    quote: path.quote,
                 });
             }
             semicolon();
@@ -1504,7 +1511,7 @@ function parse($TEXT, options) {
                 properties: keys.map(function(token, index) {
                     if (!is_token(token, "name")) token_error(token, "Name expected");
                     var sym = _make_symbol(AST_SymbolExport, token);
-                    sym.alias = aliases[index];
+                    sym.alias = make_string(aliases[index]);
                     return sym;
                 }),
             });
@@ -1594,26 +1601,42 @@ function parse($TEXT, options) {
         var all = null;
         var def = as_symbol(AST_SymbolImport, true);
         var props = null;
-        if (def ? (def.key = "", is("punc", ",") && next()) : !is("string")) {
+        var cont;
+        if (def) {
+            def.key = new AST_String({
+                start: def.start,
+                value: "",
+                end: def.end,
+            });
+            if (cont = is("punc", ",")) next();
+        } else {
+            cont = !is("string");
+        }
+        if (cont) {
             if (is("operator", "*")) {
+                var key = S.token;
                 next();
                 expect_token("name", "as");
                 all = as_symbol(AST_SymbolImport);
-                all.key = "*";
+                all.key = make_string(key);
             } else {
                 expect("{");
                 props = [];
                 while (is_alias()) {
                     var alias;
                     if (is_token(peek(), "name", "as")) {
-                        var key = S.token.value;
+                        var key = S.token;
                         next();
                         next();
                         alias = as_symbol(AST_SymbolImport);
-                        alias.key = key;
+                        alias.key = make_string(key);
                     } else {
                         alias = as_symbol(AST_SymbolImport);
-                        alias.key = alias.name;
+                        alias.key = new AST_String({
+                            start: alias.start,
+                            value: alias.name,
+                            end: alias.end,
+                        });
                     }
                     props.push(alias);
                     if (!is("punc", "}")) expect(",");
@@ -1622,15 +1645,11 @@ function parse($TEXT, options) {
             }
         }
         if (all || def || props) expect_token("name", "from");
-        var path = S.token;
-        expect_token("string");
-        semicolon();
         return new AST_Import({
             all: all,
             default: def,
-            path: path.value,
+            path: as_path(),
             properties: props,
-            quote: path.quote,
         });
     }
 
@@ -1808,7 +1827,7 @@ function parse($TEXT, options) {
             ret = new AST_BigInt({ value: value });
             break;
           case "string":
-            ret = new AST_String({ value : value, quote : tok.quote });
+            ret = new AST_String({ value: value, quote: tok.quote });
             break;
           case "regexp":
             ret = new AST_RegExp({ value: value });

test/compress/exports.js

@@ -109,6 +109,17 @@ foreign: {
     expect_exact: 'export*from"foo";export{}from"bar";export*as a from"baz";export{default}from"moo";export{b,c as case,default as delete,d}from"moz";'
 }
 
+non_identifiers: {
+    beautify = {
+        quote_style: 3,
+    }
+    input: {
+        export * as "42" from 'foo';
+        export { '42', "delete" as 'foo' } from "bar";
+    }
+    expect_exact: "export*as\"42\"from'foo';export{'42',delete as foo}from\"bar\";"
+}
+
 same_quotes: {
     beautify = {
         beautify: true,

test/compress/imports.js

@@ -40,6 +40,17 @@ default_keys: {
     expect_exact: 'import foo,{bar}from"baz";'
 }
 
+non_identifiers: {
+    beautify = {
+        quote_style: 3,
+    }
+    input: {
+        import { '42' as foo } from "bar";
+        import { "foo" as bar } from 'baz';
+    }
+    expect_exact: "import{'42'as foo}from\"bar\";import{foo as bar}from'baz';"
+}
+
 dynamic: {
     input: {
         (async a => await import(a))("foo").then(bar);

test/mocha/exports.js

@@ -1,3 +1,4 @@
+var acorn = require("acorn");
 var assert = require("assert");
 var UglifyJS = require("../node");
 
@@ -25,6 +26,7 @@ describe("export", function() {
             "export { * };",
             "export { * as A };",
             "export { 42 as A };",
+            "export { 'A' as B };",
             "export { A as B-C };",
             "export { default as A };",
         ].forEach(function(code) {
@@ -51,8 +53,11 @@ describe("export", function() {
     it("Should reject invalid `export ... from ...` statement syntax", function() {
         [
             "export from 'path';",
+            "export A from 'path';",
             "export * from `path`;",
+            "export 'A' from 'path';",
             "export A as B from 'path';",
+            "export 'A' as B from 'path';",
             "export default from 'path';",
             "export { A }, B from 'path';",
             "export * as A, B from 'path';",
@@ -128,4 +133,49 @@ describe("export", function() {
             });
         });
     });
+    it("Should interoperate with ESTree correctly", function() {
+        [
+            "export var A = 42;",
+            "export default (class A {});",
+            "var A; export { A as '42' };",
+            "export { '42' } from 'path';",
+            "export * as '42' from 'path';",
+        ].forEach(function(code) {
+            var ast = UglifyJS.parse(code);
+            try {
+                var spidermonkey = ast.to_mozilla_ast();
+            } catch (ex) {
+                assert.fail("[to_mozilla_ast] " + ex.stack);
+            }
+            try {
+                var ast2 = UglifyJS.AST_Node.from_mozilla_ast(spidermonkey);
+            } catch (ex) {
+                assert.fail("[from_mozilla_ast] " + ex.stack);
+            }
+            assert.strictEqual(ast2.print_to_string(), ast.print_to_string(), [
+                "spidermonkey:",
+                ast.print_to_string(),
+                ast2.print_to_string(),
+            ].join("\n"));
+            try {
+                var acorn_est = acorn.parse(code, {
+                    ecmaVersion: "latest",
+                    locations: true,
+                    sourceType: "module",
+                });
+            } catch (ex) {
+                assert.fail("[acorn.parse] " + ex.stack);
+            }
+            try {
+                var ast3 = UglifyJS.AST_Node.from_mozilla_ast(acorn_est);
+            } catch (ex) {
+                assert.fail("[from_acorn] " + ex.stack);
+            }
+            assert.strictEqual(ast3.print_to_string(), ast.print_to_string(), [
+                "acorn:",
+                ast.print_to_string(),
+                ast3.print_to_string(),
+            ].join("\n"));
+        });
+    });
 });

test/mocha/imports.js

@@ -1,3 +1,4 @@
+var acorn = require("acorn");
 var assert = require("assert");
 var UglifyJS = require("../node");
 
@@ -12,14 +13,21 @@ describe("import", function() {
             "import from 'path';",
             "if (0) import 'path';",
             "import * from 'path';",
+            "import 'A' from 'path';",
+            "import A-B from 'path';",
             "import A as B from 'path';",
             "import { A }, B from 'path';",
+            "import * as 'A' from 'path';",
+            "import * as A-B from 'path';",
             "import * as A, B from 'path';",
             "import * as A, {} from 'path';",
             "import { * as A } from 'path';",
+            "import { * as 'A' } from 'path';",
+            "import { * as A-B } from 'path';",
             "function f() { import 'path'; }",
             "import { 42 as A } from 'path';",
             "import { A-B as C } from 'path';",
+            "import { 'A' as 'B' } from 'path';",
         ].forEach(function(code) {
             assert.throws(function() {
                 UglifyJS.parse(code);
@@ -53,4 +61,49 @@ describe("import", function() {
             });
         });
     });
+    it("Should interoperate with ESTree correctly", function() {
+        [
+            "import A from 'path';",
+            "import * as A from 'path';",
+            "import A, * as B from 'path';",
+            "import { '42' as A, B } from 'path';",
+            "import A, { '42' as B } from 'path';",
+        ].forEach(function(code) {
+            var ast = UglifyJS.parse(code);
+            try {
+                var spidermonkey = ast.to_mozilla_ast();
+            } catch (ex) {
+                assert.fail("[to_mozilla_ast] " + ex.stack);
+            }
+            try {
+                var ast2 = UglifyJS.AST_Node.from_mozilla_ast(spidermonkey);
+            } catch (ex) {
+                assert.fail("[from_mozilla_ast] " + ex.stack);
+            }
+            assert.strictEqual(ast2.print_to_string(), ast.print_to_string(), [
+                "spidermonkey:",
+                ast.print_to_string(),
+                ast2.print_to_string(),
+            ].join("\n"));
+            try {
+                var acorn_est = acorn.parse(code, {
+                    ecmaVersion: "latest",
+                    locations: true,
+                    sourceType: "module",
+                });
+            } catch (ex) {
+                assert.fail("[acorn.parse] " + ex.stack);
+            }
+            try {
+                var ast3 = UglifyJS.AST_Node.from_mozilla_ast(acorn_est);
+            } catch (ex) {
+                assert.fail("[from_acorn] " + ex.stack);
+            }
+            assert.strictEqual(ast3.print_to_string(), ast.print_to_string(), [
+                "acorn:",
+                ast.print_to_string(),
+                ast3.print_to_string(),
+            ].join("\n"));
+        });
+    });
 });