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@@ -400,6 +400,38 @@ Acorn is really fast (e.g. 250ms instead of 380ms on some 650K code), but converting the SpiderMonkey tree that Acorn produces takes another 150ms so in total it's a bit more than just using UglifyJS's own parser. +### Using UglifyJS to transform SpiderMonkey AST + +Now you can use UglifyJS as any other intermediate tool for transforming +JavaScript ASTs in SpiderMonkey format. + +Example: + +```javascript +function uglify(ast, options, mangle) { + // Conversion from SpiderMonkey AST to internal format + var uAST = UglifyJS.AST_Node.from_mozilla_ast(ast); + + // Compression + uAST.figure_out_scope(); + uAST = uAST.transform(UglifyJS.Compressor(options)); + + // Mangling (optional) + if (mangle) { + uAST.figure_out_scope(); + uAST.compute_char_frequency(); + uAST.mangle_names(); + } + + // Back-conversion to SpiderMonkey AST + return uAST.to_mozilla_ast(); +} +``` + +Check out +[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/) +for details. + API Reference ------------- |