introduce --safari10 (#2530)

README.md

@@ -111,6 +111,11 @@ a double dash to prevent input files being used as option arguments:
     --keep-fnames               Do not mangle/drop function names.  Useful for
                                 code relying on Function.prototype.name.
     --name-cache <file>         File to hold mangled name mappings.
+    --safari10                  Support non-standard Safari 10/11.
+                                Equivalent to setting `safari10: true` in `minify()`
+                                for `mangle` and `output` options.
+                                By default `uglify-es` will not work around
+                                Safari 10/11 bugs.
     --self                      Build UglifyJS as a library (implies --wrap UglifyJS)
     --source-map [options]      Enable source map/specify source map options:
                                 `base`  Path to compute relative paths from input files.

bin/uglifyjs

@@ -50,6 +50,7 @@ program.option("--keep-classnames", "Do not mangle/drop class names.");
 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("--no-rename", "Disable symbol expansion.");
+program.option("--safari10", "Support non-standard Safari 10.");
 program.option("--self", "Build UglifyJS as a library (implies --wrap UglifyJS)");
 program.option("--source-map [options]", "Enable source map/specify source map options.", parse_source_map());
 program.option("--timings", "Display operations run time on STDERR.")
@@ -69,6 +70,7 @@ if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
     "ie8",
     "mangle",
     "rename",
+    "safari10",
     "sourceMap",
     "toplevel",
     "wrap"

lib/minify.js

@@ -58,6 +58,7 @@ function minify(files, options) {
             output: {},
             parse: {},
             rename: undefined,
+            safari10: false,
             sourceMap: false,
             timings: false,
             toplevel: false,
@@ -77,6 +78,7 @@ function minify(files, options) {
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
         set_shorthand("keep_classnames", options, [ "compress", "mangle" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
+        set_shorthand("safari10", options, [ "mangle", "output" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
         set_shorthand("warnings", options, [ "compress" ]);
         var quoted_props;

test/mocha/cli.js

@@ -16,7 +16,7 @@ describe("bin/uglifyjs", function () {
         command += semver.satisfies(process.version, ">=4") ? "6" : "5";
         command += ',passes=3,keep_fargs=false,unsafe --wrap WrappedUglifyJS';
 
-        exec(command, function (err, stdout) {
+        exec(command, { maxBuffer: 1048576 }, function (err, stdout) {
             if (err) throw err;
 
             eval(stdout);