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-UglifyJS 3
-==========
-
-UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.
-
-#### Note:
-- **`uglify-js@3` has a simplified [API](#api-reference) and [CLI](#command-line-usage) that is not backwards compatible with [`uglify-js@2`](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
-- **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
-- `uglify-js` only supports JavaScript (ECMAScript 5).
-- To minify ECMAScript 2015 or above, transpile using tools like [Babel](https://babeljs.io/).
-
-Install
--------
-
-First make sure you have installed the latest version of [node.js](http://nodejs.org/)
-(You may need to restart your computer after this step).
-
-From NPM for use as a command line app:
-
-    npm install uglify-js -g
-
-From NPM for programmatic use:
-
-    npm install uglify-js
-
-# Command line usage
-
-    uglifyjs [input files] [options]
-
-UglifyJS can take multiple input files.  It's recommended that you pass the
-input files first, then pass the options.  UglifyJS will parse input files
-in sequence and apply any compression options.  The files are parsed in the
-same global scope, that is, a reference from a file to some
-variable/function declared in another file will be matched properly.
-
-If no input file is specified, UglifyJS will read from STDIN.
-
-If you wish to pass your options before the input files, separate the two with
-a double dash to prevent input files being used as option arguments:
-
-    uglifyjs --compress --mangle -- input.js
-
-### Command line options
-
-```
-    -h, --help                  Print usage information.
-                                `--help options` for details on available options.
-    -V, --version               Print version number.
-    -p, --parse <options>       Specify parser options:
-                                `acorn`  Use Acorn for parsing.
-                                `bare_returns`  Allow return outside of functions.
-                                                Useful when minifying CommonJS
-                                                modules and Userscripts that may
-                                                be anonymous function wrapped (IIFE)
-                                                by the .user.js engine `caller`.
-                                `expression`  Parse a single expression, rather than
-                                              a program (for parsing JSON).
-                                `spidermonkey`  Assume input files are SpiderMonkey
-                                                AST format (as JSON).
-    -c, --compress [options]    Enable compressor/specify compressor options:
-                                `pure_funcs`  List of functions that can be safely
-                                              removed when their return values are
-                                              not used.
-    -m, --mangle [options]      Mangle names/specify mangler options:
-                                `reserved`  List of names that should not be mangled.
-    --mangle-props [options]    Mangle properties/specify mangler options:
-                                `builtins`  Mangle property names that overlaps
-                                            with standard JavaScript globals.
-                                `debug`  Add debug prefix and suffix.
-                                `domprops`  Mangle property names that overlaps
-                                            with DOM properties.
-                                `keep_quoted`  Only mangle unquoted properties.
-                                `regex`  Only mangle matched property names.
-                                `reserved`  List of names that should not be mangled.
-    -b, --beautify [options]    Beautify output/specify output options:
-                                `beautify`  Enabled with `--beautify` by default.
-                                `preamble`  Preamble to prepend to the output. You
-                                            can use this to insert a comment, for
-                                            example for licensing information.
-                                            This will not be parsed, but the source
-                                            map will adjust for its presence.
-                                `quote_style`  Quote style:
-                                               0 - auto
-                                               1 - single
-                                               2 - double
-                                               3 - original
-                                `wrap_iife`  Wrap IIFEs in parenthesis. Note: you may
-                                             want to disable `negate_iife` under
-                                             compressor options.
-    -o, --output <file>         Output file path (default STDOUT). Specify `ast` or
-                                `spidermonkey` to write UglifyJS or SpiderMonkey AST
-                                as JSON to STDOUT respectively.
-    --comments [filter]         Preserve copyright comments in the output. By
-                                default this works like Google Closure, keeping
-                                JSDoc-style comments that contain "@license" or
-                                "@preserve". You can optionally pass one of the
-                                following arguments to this flag:
-                                - "all" to keep all comments
-                                - a valid JS RegExp like `/foo/` or `/^!/` to
-                                keep only matching comments.
-                                Note that currently not *all* comments can be
-                                kept when compression is on, because of dead
-                                code removal or cascading statements into
-                                sequences.
-    --config-file <file>        Read `minify()` options from JSON file.
-    -d, --define <expr>[=value] Global definitions.
-    -e, --enclose [arg[:value]] Embed everything in a big function, with configurable
-                                argument(s) & value(s).
-    --ie8                       Support non-standard Internet Explorer 8.
-                                Equivalent to setting `ie8: true` in `minify()`
-                                for `compress`, `mangle` and `output` options.
-                                By default UglifyJS will not try to be IE-proof.
-    --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.
-    --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.
-                                `content`  Input source map, useful if you're compressing
-                                           JS that was generated from some other original
-                                           code. Specify "inline" if the source map is
-                                           included within the sources.
-                                `filename`  Filename and/or location of the output source
-                                            (sets `file` attribute in source map).
-                                `includeSources`  Pass this flag if you want to include
-                                                  the content of source files in the
-                                                  source map as sourcesContent property.
-                                `root`  Path to the original source to be included in
-                                        the source map.
-                                `url`  If specified, path to the source map to append in
-                                       `//# sourceMappingURL`.
-    --timings                   Display operations run time on STDERR.
-    --toplevel                  Compress and/or mangle variables in top level scope.
-    --verbose                   Print diagnostic messages.
-    --warn                      Print warning messages.
-    --wrap <name>               Embed everything in a big function, making the
-                                “exports” and “global” variables available. You
-                                need to pass an argument to this option to
-                                specify the name that your module will take
-                                when included in, say, a browser.
-```
-
-Specify `--output` (`-o`) to declare the output file.  Otherwise the output
-goes to STDOUT.
-
-## CLI source map options
-
-UglifyJS can generate a source map file, which is highly useful for
-debugging your compressed JavaScript.  To get a source map, pass
-`--source-map --output output.js` (source map will be written out to
-`output.js.map`).
-
-Additional options:
-
-- `--source-map "filename='<NAME>'"` to specify the name of the source map. The value of
-  `filename` is only used to set `file` attribute (see [the spec][sm-spec])
-  in source map file.
-
-- `--source-map "root='<URL>'"` to pass the URL where the original files can be found.
-
-- `--source-map "url='<URL>'"` to specify the URL where the source map can be found.
-  Otherwise UglifyJS assumes HTTP `X-SourceMap` is being used and will omit the
-  `//# sourceMappingURL=` directive.
-
-For example:
-
-    uglifyjs js/file1.js js/file2.js \
-             -o foo.min.js -c -m \
-             --source-map "root='http://foo.com/src',url='foo.min.js.map'"
-
-The above will compress and mangle `file1.js` and `file2.js`, will drop the
-output in `foo.min.js` and the source map in `foo.min.js.map`.  The source
-mapping will refer to `http://foo.com/src/js/file1.js` and
-`http://foo.com/src/js/file2.js` (in fact it will list `http://foo.com/src`
-as the source map root, and the original files as `js/file1.js` and
-`js/file2.js`).
-
-### Composed source map
-
-When you're compressing JS code that was output by a compiler such as
-CoffeeScript, mapping to the JS code won't be too helpful.  Instead, you'd
-like to map back to the original code (i.e. CoffeeScript).  UglifyJS has an
-option to take an input source map.  Assuming you have a mapping from
-CoffeeScript → compiled JS, UglifyJS can generate a map from CoffeeScript →
-compressed JS by mapping every token in the compiled JS to its original
-location.
-
-To use this feature pass `--source-map "content='/path/to/input/source.map'"`
-or `--source-map "content=inline"` if the source map is included inline with
-the sources.
-
-## CLI compress options
-
-You need to pass `--compress` (`-c`) to enable the compressor.  Optionally
-you can pass a comma-separated list of [compress options](#compress-options).
-
-Options are in the form `foo=bar`, or just `foo` (the latter implies
-a boolean option that you want to set `true`; it's effectively a
-shortcut for `foo=true`).
-
-Example:
-
-    uglifyjs file.js -c toplevel,sequences=false
-
-## CLI mangle options
-
-To enable the mangler you need to pass `--mangle` (`-m`).  The following
-(comma-separated) options are supported:
-
-- `toplevel` (default `false`) -- mangle names declared in the top level scope.
-
-- `eval` (default `false`) -- mangle names visible in scopes where `eval` or `with` are used.
-
-When mangling is enabled but you want to prevent certain names from being
-mangled, you can declare those names with `--mangle reserved` — pass a
-comma-separated list of names.  For example:
-
-    uglifyjs ... -m reserved=['$','require','exports']
-
-to prevent the `require`, `exports` and `$` names from being changed.
-
-### CLI mangling property names (`--mangle-props`)
-
-**Note:** THIS WILL PROBABLY BREAK YOUR CODE.  Mangling property names
-is a separate step, different from variable name mangling.  Pass
-`--mangle-props` to enable it.  It will mangle all properties in the
-input code with the exception of built in DOM properties and properties
-in core JavaScript classes.  For example:
-
-```javascript
-// example.js
-var x = {
-    baz_: 0,
-    foo_: 1,
-    calc: function() {
-        return this.foo_ + this.baz_;
-    }
-};
-x.bar_ = 2;
-x["baz_"] = 3;
-console.log(x.calc());
-```
-Mangle all properties (except for JavaScript `builtins`):
-```bash
-$ uglifyjs example.js -c -m --mangle-props
-```
-```javascript
-var x={o:0,_:1,l:function(){return this._+this.o}};x.t=2,x.o=3,console.log(x.l());
-```
-Mangle all properties except for `reserved` properties:
-```bash
-$ uglifyjs example.js -c -m --mangle-props reserved=[foo_,bar_]
-```
-```javascript
-var x={o:0,foo_:1,_:function(){return this.foo_+this.o}};x.bar_=2,x.o=3,console.log(x._());
-```
-Mangle all properties matching a `regex`:
-```bash
-$ uglifyjs example.js -c -m --mangle-props regex=/_$/
-```
-```javascript
-var x={o:0,_:1,calc:function(){return this._+this.o}};x.l=2,x.o=3,console.log(x.calc());
-```
-
-Combining mangle properties options:
-```bash
-$ uglifyjs example.js -c -m --mangle-props regex=/_$/,reserved=[bar_]
-```
-```javascript
-var x={o:0,_:1,calc:function(){return this._+this.o}};x.bar_=2,x.o=3,console.log(x.calc());
-```
-
-In order for this to be of any use, we avoid mangling standard JS names by
-default (`--mangle-props builtins` to override).
-
-A default exclusion file is provided in `tools/domprops.json` which should
-cover most standard JS and DOM properties defined in various browsers.  Pass
-`--mangle-props domprops` to disable this feature.
-
-A regular expression can be used to define which property names should be
-mangled.  For example, `--mangle-props regex=/^_/` will only mangle property
-names that start with an underscore.
-
-When you compress multiple files using this option, in order for them to
-work together in the end we need to ensure somehow that one property gets
-mangled to the same name in all of them.  For this, pass `--name-cache filename.json`
-and UglifyJS will maintain these mappings in a file which can then be reused.
-It should be initially empty.  Example:
-
-```bash
-$ rm -f /tmp/cache.json  # start fresh
-$ uglifyjs file1.js file2.js --mangle-props --name-cache /tmp/cache.json -o part1.js
-$ uglifyjs file3.js file4.js --mangle-props --name-cache /tmp/cache.json -o part2.js
-```
-
-Now, `part1.js` and `part2.js` will be consistent with each other in terms
-of mangled property names.
-
-Using the name cache is not necessary if you compress all your files in a
-single call to UglifyJS.
-
-### Mangling unquoted names (`--mangle-props keep_quoted`)
-
-Using quoted property name (`o["foo"]`) reserves the property name (`foo`)
-so that it is not mangled throughout the entire script even when used in an
-unquoted style (`o.foo`). Example:
-
-```javascript
-// stuff.js
-var o = {
-    "foo": 1,
-    bar: 3
-};
-o.foo += o.bar;
-console.log(o.foo);
-```
-```bash
-$ uglifyjs stuff.js --mangle-props keep_quoted -c -m
-```
-```javascript
-var o={foo:1,o:3};o.foo+=o.o,console.log(o.foo);
-```
-
-### Debugging property name mangling
-
-You can also pass `--mangle-props debug` in order to mangle property names
-without completely obscuring them. For example the property `o.foo`
-would mangle to `o._$foo$_` with this option. This allows property mangling
-of a large codebase while still being able to debug the code and identify
-where mangling is breaking things.
-
-```bash
-$ uglifyjs stuff.js --mangle-props debug -c -m
-```
-```javascript
-var o={_$foo$_:1,_$bar$_:3};o._$foo$_+=o._$bar$_,console.log(o._$foo$_);
-```
-
-You can also pass a custom suffix using `--mangle-props debug=XYZ`. This would then
-mangle `o.foo` to `o._$foo$XYZ_`. You can change this each time you compile a
-script to identify how a property got mangled. One technique is to pass a
-random number on every compile to simulate mangling changing with different
-inputs (e.g. as you update the input script with new properties), and to help
-identify mistakes like writing mangled keys to storage.
-
-
-# API Reference
-
-Assuming installation via NPM, you can load UglifyJS in your application
-like this:
-```javascript
-var UglifyJS = require("uglify-js");
-```
-
-There is a single high level function, **`minify(code, options)`**,
-which will perform all minification [phases](#minify-options) in a configurable
-manner. By default `minify()` will enable the options [`compress`](#compress-options)
-and [`mangle`](#mangle-options). Example:
-```javascript
-var code = "function add(first, second) { return first + second; }";
-var result = UglifyJS.minify(code);
-console.log(result.error); // runtime error, or `undefined` if no error
-console.log(result.code);  // minified output: function add(n,d){return n+d}
-```
-
-You can `minify` more than one JavaScript file at a time by using an object
-for the first argument where the keys are file names and the values are source
-code:
-```javascript
-var code = {
-    "file1.js": "function add(first, second) { return first + second; }",
-    "file2.js": "console.log(add(1 + 2, 3 + 4));"
-};
-var result = UglifyJS.minify(code);
-console.log(result.code);
-// function add(d,n){return d+n}console.log(add(3,7));
-```
-
-The `toplevel` option:
-```javascript
-var code = {
-    "file1.js": "function add(first, second) { return first + second; }",
-    "file2.js": "console.log(add(1 + 2, 3 + 4));"
-};
-var options = { toplevel: true };
-var result = UglifyJS.minify(code, options);
-console.log(result.code);
-// console.log(3+7);
-```
-
-The `nameCache` option:
-```javascript
-var options = {
-    mangle: {
-        toplevel: true,
-    },
-    nameCache: {}
-};
-var result1 = UglifyJS.minify({
-    "file1.js": "function add(first, second) { return first + second; }"
-}, options);
-var result2 = UglifyJS.minify({
-    "file2.js": "console.log(add(1 + 2, 3 + 4));"
-}, options);
-console.log(result1.code);
-// function n(n,r){return n+r}
-console.log(result2.code);
-// console.log(n(3,7));
-```
-
-You may persist the name cache to the file system in the following way:
-```javascript
-var cacheFileName = "/tmp/cache.json";
-var options = {
-    mangle: {
-        properties: true,
-    },
-    nameCache: JSON.parse(fs.readFileSync(cacheFileName, "utf8"))
-};
-fs.writeFileSync("part1.js", UglifyJS.minify({
-    "file1.js": fs.readFileSync("file1.js", "utf8"),
-    "file2.js": fs.readFileSync("file2.js", "utf8")
-}, options).code, "utf8");
-fs.writeFileSync("part2.js", UglifyJS.minify({
-    "file3.js": fs.readFileSync("file3.js", "utf8"),
-    "file4.js": fs.readFileSync("file4.js", "utf8")
-}, options).code, "utf8");
-fs.writeFileSync(cacheFileName, JSON.stringify(options.nameCache), "utf8");
-```
-
-An example of a combination of `minify()` options:
-```javascript
-var code = {
-    "file1.js": "function add(first, second) { return first + second; }",
-    "file2.js": "console.log(add(1 + 2, 3 + 4));"
-};
-var options = {
-    toplevel: true,
-    compress: {
-        global_defs: {
-            "@console.log": "alert"
-        },
-        passes: 2
-    },
-    output: {
-        beautify: false,
-        preamble: "/* uglified */"
-    }
-};
-var result = UglifyJS.minify(code, options);
-console.log(result.code);
-// /* uglified */
-// alert(10);"
-```
-
-To produce warnings:
-```javascript
-var code = "function f(){ var u; return 2 + 3; }";
-var options = { warnings: true };
-var result = UglifyJS.minify(code, options);
-console.log(result.error);    // runtime error, `undefined` in this case
-console.log(result.warnings); // [ 'Dropping unused variable u [0:1,18]' ]
-console.log(result.code);     // function f(){return 5}
-```
-
-An error example:
-```javascript
-var result = UglifyJS.minify({"foo.js" : "if (0) else console.log(1);"});
-console.log(JSON.stringify(result.error));
-// {"message":"Unexpected token: keyword (else)","filename":"foo.js","line":1,"col":7,"pos":7}
-```
-Note: unlike `uglify-js@2.x`, the `3.x` API does not throw errors. To
-achieve a similar effect one could do the following:
-```javascript
-var result = UglifyJS.minify(code, options);
-if (result.error) throw result.error;
-```
-
-## Minify options
-
-- `warnings` (default `false`) — pass `true` to return compressor warnings
-  in `result.warnings`. Use the value `"verbose"` for more detailed warnings.
-
-- `parse` (default `{}`) — pass an object if you wish to specify some
-  additional [parse options](#parse-options).
-
-- `compress` (default `{}`) — pass `false` to skip compressing entirely.
-  Pass an object to specify custom [compress options](#compress-options).
-
-- `mangle` (default `true`) — pass `false` to skip mangling names, or pass
-  an object to specify [mangle options](#mangle-options) (see below).
-
-  - `mangle.properties` (default `false`) — a subcategory of the mangle option.
-    Pass an object to specify custom [mangle property options](#mangle-properties-options).
-
-- `output` (default `null`) — pass an object if you wish to specify
-  additional [output options](#output-options).  The defaults are optimized
-  for best compression.
-
-- `sourceMap` (default `false`) - pass an object if you wish to specify
-  [source map options](#source-map-options).
-
-- `toplevel` (default `false`) - set to `true` if you wish to enable top level
-  variable and function name mangling and to drop unused variables and functions.
-
-- `nameCache` (default `null`) - pass an empty object `{}` or a previously
-  used `nameCache` object if you wish to cache mangled variable and
-  property names across multiple invocations of `minify()`. Note: this is
-  a read/write property. `minify()` will read the name cache state of this
-  object and update it during minification so that it may be
-  reused or externally persisted by the user.
-
-- `ie8` (default `false`) - set to `true` to support IE8.
-
-- `keep_fnames` (default: `false`) - pass `true` to prevent discarding or mangling
-  of function names.  Useful for code relying on `Function.prototype.name`.
-
-## Minify options structure
-
-```javascript
-{
-    parse: {
-        // parse options
-    },
-    compress: {
-        // compress options
-    },
-    mangle: {
-        // mangle options
-
-        properties: {
-            // mangle property options
-        }
-    },
-    output: {
-        // output options
-    },
-    sourceMap: {
-        // source map options
-    },
-    nameCache: null, // or specify a name cache object
-    toplevel: false,
-    ie8: false,
-    warnings: false,
-}
-```
-
-### Source map options
-
-To generate a source map:
-```javascript
-var result = UglifyJS.minify({"file1.js": "var a = function() {};"}, {
-    sourceMap: {
-        filename: "out.js",
-        url: "out.js.map"
-    }
-});
-console.log(result.code); // minified output
-console.log(result.map);  // source map
-```
-
-Note that the source map is not saved in a file, it's just returned in
-`result.map`.  The value passed for `sourceMap.url` is only used to set
-`//# sourceMappingURL=out.js.map` in `result.code`. The value of
-`filename` is only used to set `file` attribute (see [the spec][sm-spec])
-in source map file.
-
-You can set option `sourceMap.url` to be `"inline"` and source map will
-be appended to code.
-
-You can also specify sourceRoot property to be included in source map:
-```javascript
-var result = UglifyJS.minify({"file1.js": "var a = function() {};"}, {
-    sourceMap: {
-        root: "http://example.com/src",
-        url: "out.js.map"
-    }
-});
-```
-
-If you're compressing compiled JavaScript and have a source map for it, you
-can use `sourceMap.content`:
-```javascript
-var result = UglifyJS.minify({"compiled.js": "compiled code"}, {
-    sourceMap: {
-        content: "content from compiled.js.map",
-        url: "minified.js.map"
-    }
-});
-// same as before, it returns `code` and `map`
-```
-
-If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.url`.
-
-## Parse options
-
-- `bare_returns` (default `false`) -- support top level `return` statements
-
-- `html5_comments` (default `true`)
-
-- `shebang` (default `true`) -- support `#!command` as the first line
-
-## Compress options
-
-- `arguments` (default: `true`) -- replace `arguments[index]` with function
-  parameter name whenever possible.
-
-- `booleans` (default: `true`) -- various optimizations for boolean context,
-  for example `!!a ? b : c → a ? b : c`
-
-- `collapse_vars` (default: `true`) -- Collapse single-use non-constant variables,
-  side effects permitting.
-
-- `comparisons` (default: `true`) -- apply certain optimizations to binary nodes,
-  e.g. `!(a <= b) → a > b`, attempts to negate binary nodes, e.g.
-  `a = !b && !c && !d && !e → a=!(b||c||d||e)` etc.
-
-- `conditionals` (default: `true`) -- apply optimizations for `if`-s and conditional
-  expressions
-
-- `dead_code` (default: `true`) -- remove unreachable code
-
-- `directives` (default: `true`) -- remove redundant or non-standard directives
-
-- `drop_console` (default: `false`) -- Pass `true` to discard calls to
-  `console.*` functions. If you wish to drop a specific function call
-  such as `console.info` and/or retain side effects from function arguments
-  after dropping the function call then use `pure_funcs` instead.
-
-- `drop_debugger` (default: `true`) -- remove `debugger;` statements
-
-- `evaluate` (default: `true`) -- attempt to evaluate constant expressions
-
-- `expression` (default: `false`) -- Pass `true` to preserve completion values
-  from terminal statements without `return`, e.g. in bookmarklets.
-
-- `global_defs` (default: `{}`) -- see [conditional compilation](#conditional-compilation)
-
-- `hoist_funs` (default: `false`) -- hoist function declarations
-
-- `hoist_props` (default: `true`) -- hoist properties from constant object and
-  array literals into regular variables subject to a set of constraints. For example:
-  `var o={p:1, q:2}; f(o.p, o.q);` is converted to `f(1, 2);`. Note: `hoist_props`
-  works best with `mangle` enabled, the `compress` option `passes` set to `2` or higher,
-  and the `compress` option `toplevel` enabled.
-
-- `hoist_vars` (default: `false`) -- hoist `var` declarations (this is `false`
-  by default because it seems to increase the size of the output in general)
-
-- `if_return` (default: `true`) -- optimizations for if/return and if/continue
-
-- `inline` (default: `true`) -- inline calls to function with simple/`return` statement:
-  - `false` -- same as `0`
-  - `0` -- disabled inlining
-  - `1` -- inline simple functions
-  - `2` -- inline functions with arguments
-  - `3` -- inline functions with arguments and variables
-  - `true` -- same as `3`
-
-- `join_vars` (default: `true`) -- join consecutive `var` statements
-
-- `keep_fargs` (default: `true`) -- Prevents the compressor from discarding unused
-  function arguments.  You need this for code which relies on `Function.length`.
-
-- `keep_fnames` (default: `false`) -- Pass `true` to prevent the
-  compressor from discarding function names.  Useful for code relying on
-  `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle).
-
-- `keep_infinity` (default: `false`) -- Pass `true` to prevent `Infinity` from
-  being compressed into `1/0`, which may cause performance issues on Chrome.
-
-- `loops` (default: `true`) -- optimizations for `do`, `while` and `for` loops
-  when we can statically determine the condition.
-
-- `negate_iife` (default: `true`) -- negate "Immediately-Called Function Expressions"
-  where the return value is discarded, to avoid the parens that the
-  code generator would insert.
-
-- `passes` (default: `1`) -- The maximum number of times to run compress.
-  In some cases more than one pass leads to further compressed code.  Keep in
-  mind more passes will take more time.
-
-- `properties` (default: `true`) -- rewrite property access using the dot notation, for
-  example `foo["bar"] → foo.bar`
-
-- `pure_funcs` (default: `null`) -- You can pass an array of names and
-  UglifyJS will assume that those functions do not produce side
-  effects.  DANGER: will not check if the name is redefined in scope.
-  An example case here, for instance `var q = Math.floor(a/b)`.  If
-  variable `q` is not used elsewhere, UglifyJS will drop it, but will
-  still keep the `Math.floor(a/b)`, not knowing what it does.  You can
-  pass `pure_funcs: [ 'Math.floor' ]` to let it know that this
-  function won't produce any side effect, in which case the whole
-  statement would get discarded.  The current implementation adds some
-  overhead (compression will be slower). Make sure symbols under `pure_funcs`
-  are also under `mangle.reserved` to avoid mangling.
-
-- `pure_getters` (default: `"strict"`) -- If you pass `true` for
-  this, UglifyJS will assume that object property access
-  (e.g. `foo.bar` or `foo["bar"]`) doesn't have any side effects.
-  Specify `"strict"` to treat `foo.bar` as side-effect-free only when
-  `foo` is certain to not throw, i.e. not `null` or `undefined`.
-
-- `reduce_funcs` (default: `true`) -- Allows single-use functions to be
-  inlined as function expressions when permissible allowing further
-  optimization.  Enabled by default.  Option depends on `reduce_vars`
-  being enabled.  Some code runs faster in the Chrome V8 engine if this
-  option is disabled.  Does not negatively impact other major browsers.
-
-- `reduce_vars` (default: `true`) -- Improve optimization on variables assigned with and
-  used as constant values.
-
-- `sequences` (default: `true`) -- join consecutive simple statements using the
-  comma operator.  May be set to a positive integer to specify the maximum number
-  of consecutive comma sequences that will be generated. If this option is set to
-  `true` then the default `sequences` limit is `200`. Set option to `false` or `0`
-  to disable. The smallest `sequences` length is `2`. A `sequences` value of `1`
-  is grandfathered to be equivalent to `true` and as such means `200`. On rare
-  occasions the default sequences limit leads to very slow compress times in which
-  case a value of `20` or less is recommended.
-
-- `side_effects` (default: `true`) -- Pass `false` to disable potentially dropping
-  functions marked as "pure".  A function call is marked as "pure" if a comment
-  annotation `/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For
-  example: `/*@__PURE__*/foo();`
-
-- `switches` (default: `true`) -- de-duplicate and remove unreachable `switch` branches
-
-- `toplevel` (default: `false`) -- drop unreferenced functions (`"funcs"`) and/or
-  variables (`"vars"`) in the top level scope (`false` by default, `true` to drop
-  both unreferenced functions and variables)
-
-- `top_retain` (default: `null`) -- prevent specific toplevel functions and
-  variables from `unused` removal (can be array, comma-separated, RegExp or
-  function. Implies `toplevel`)
-
-- `typeofs` (default: `true`) -- Transforms `typeof foo == "undefined"` into
-  `foo === void 0`.  Note: recommend to set this value to `false` for IE10 and
-  earlier versions due to known issues.
-
-- `unsafe` (default: `false`) -- apply "unsafe" transformations (discussion below)
-
-- `unsafe_comps` (default: `false`) -- compress expressions like `a <= b` assuming
-  none of the operands can be (coerced to) `NaN`.
-
-- `unsafe_Function` (default: `false`) -- compress and mangle `Function(args, code)`
-  when both `args` and `code` are string literals.
-
-- `unsafe_math` (default: `false`) -- optimize numerical expressions like
-  `2 * x * 3` into `6 * x`, which may give imprecise floating point results.
-
-- `unsafe_proto` (default: `false`) -- optimize expressions like
-  `Array.prototype.slice.call(a)` into `[].slice.call(a)`
-
-- `unsafe_regexp` (default: `false`) -- enable substitutions of variables with
-  `RegExp` values the same way as if they are constants.
-
-- `unsafe_undefined` (default: `false`) -- substitute `void 0` if there is a
-  variable named `undefined` in scope (variable name will be mangled, typically
-  reduced to a single character)
-
-- `unused` (default: `true`) -- drop unreferenced functions and variables (simple
-  direct variable assignments do not count as references unless set to `"keep_assign"`)
-
-- `warnings` (default: `false`) -- display warnings when dropping unreachable
-  code or unused declarations etc.
-
-## Mangle options
-
-- `eval` (default `false`) -- Pass `true` to mangle names visible in scopes
-  where `eval` or `with` are used.
-
-- `keep_fnames` (default `false`) -- Pass `true` to not mangle function names.
-  Useful for code relying on `Function.prototype.name`. See also: the `keep_fnames`
-  [compress option](#compress-options).
-
-- `reserved` (default `[]`) -- Pass an array of identifiers that should be
-  excluded from mangling. Example: `["foo", "bar"]`.
-
-- `toplevel` (default `false`) -- Pass `true` to mangle names declared in the
-  top level scope.
-
-Examples:
-
-```javascript
-// test.js
-var globalVar;
-function funcName(firstLongName, anotherLongName) {
-    var myVariable = firstLongName +  anotherLongName;
-}
-```
-```javascript
-var code = fs.readFileSync("test.js", "utf8");
-
-UglifyJS.minify(code).code;
-// 'function funcName(a,n){}var globalVar;'
-
-UglifyJS.minify(code, { mangle: { reserved: ['firstLongName'] } }).code;
-// 'function funcName(firstLongName,a){}var globalVar;'
-
-UglifyJS.minify(code, { mangle: { toplevel: true } }).code;
-// 'function n(n,a){}var a;'
-```
-
-### Mangle properties options
-
-- `builtins` (default: `false`) -- Use `true` to allow the mangling of builtin
-  DOM properties. Not recommended to override this setting.
-
-- `debug` (default: `false`) -— Mangle names with the original name still present.
-  Pass an empty string `""` to enable, or a non-empty string to set the debug suffix.
-
-- `keep_quoted` (default: `false`) -— Only mangle unquoted property names.
-
-- `regex` (default: `null`) -— Pass a RegExp literal to only mangle property
-  names matching the regular expression.
-
-- `reserved` (default: `[]`) -- Do not mangle property names listed in the
-  `reserved` array.
-
-## Output options
-
-The code generator tries to output shortest code possible by default.  In
-case you want beautified output, pass `--beautify` (`-b`).  Optionally you
-can pass additional arguments that control the code output:
-
-- `ascii_only` (default `false`) -- escape Unicode characters in strings and
-  regexps (affects directives with non-ascii characters becoming invalid)
-
-- `beautify` (default `true`) -- whether to actually beautify the output.
-  Passing `-b` will set this to true, but you might need to pass `-b` even
-  when you want to generate minified code, in order to specify additional
-  arguments, so you can use `-b beautify=false` to override it.
-
-- `braces` (default `false`) -- always insert braces in `if`, `for`,
-  `do`, `while` or `with` statements, even if their body is a single
-  statement.
-
-- `comments` (default `false`) -- pass `true` or `"all"` to preserve all
-  comments, `"some"` to preserve some comments, a regular expression string
-  (e.g. `/^!/`) or a function.
-
-- `indent_level` (default `4`)
-
-- `indent_start` (default `0`) -- prefix all lines by that many spaces
-
-- `inline_script` (default `true`) -- escape HTML comments and the slash in
-  occurrences of `</script>` in strings
-
-- `keep_quoted_props` (default `false`) -- when turned on, prevents stripping
-  quotes from property names in object literals.
-
-- `max_line_len` (default `false`) -- maximum line length (for uglified code)
-
-- `preamble` (default `null`) -- when passed it must be a string and
-  it will be prepended to the output literally.  The source map will
-  adjust for this text.  Can be used to insert a comment containing
-  licensing information, for example.
-
-- `preserve_line` (default `false`) -- pass `true` to retain line numbering on
-  a best effort basis.
-
-- `quote_keys` (default `false`) -- pass `true` to quote all keys in literal
-  objects
-
-- `quote_style` (default `0`) -- preferred quote style for strings (affects
-  quoted property names and directives as well):
-  - `0` -- prefers double quotes, switches to single quotes when there are
-    more double quotes in the string itself. `0` is best for gzip size.
-  - `1` -- always use single quotes
-  - `2` -- always use double quotes
-  - `3` -- always use the original quotes
-
-- `semicolons` (default `true`) -- separate statements with semicolons.  If
-  you pass `false` then whenever possible we will use a newline instead of a
-  semicolon, leading to more readable output of uglified code (size before
-  gzip could be smaller; size after gzip insignificantly larger).
-
-- `shebang` (default `true`) -- preserve shebang `#!` in preamble (bash scripts)
-
-- `webkit` (default `false`) -- enable workarounds for WebKit bugs.
-  PhantomJS users should set this option to `true`.
-
-- `width` (default `80`) -- only takes effect when beautification is on, this
-  specifies an (orientative) line width that the beautifier will try to
-  obey.  It refers to the width of the line text (excluding indentation).
-  It doesn't work very well currently, but it does make the code generated
-  by UglifyJS more readable.
-
-- `wrap_iife` (default `false`) -- pass `true` to wrap immediately invoked
-  function expressions. See
-  [#640](https://github.com/mishoo/UglifyJS2/issues/640) for more details.
-
-# Miscellaneous
-
-### Keeping copyright notices or other comments
-
-You can pass `--comments` to retain certain comments in the output.  By
-default it will keep JSDoc-style comments that contain "@preserve",
-"@license" or "@cc_on" (conditional compilation for IE).  You can pass
-`--comments all` to keep all the comments, or a valid JavaScript regexp to
-keep only comments that match this regexp.  For example `--comments /^!/`
-will keep comments like `/*! Copyright Notice */`.
-
-Note, however, that there might be situations where comments are lost.  For
-example:
-```javascript
-function f() {
-    /** @preserve Foo Bar */
-    function g() {
-        // this function is never called
-    }
-    return something();
-}
-```
-
-Even though it has "@preserve", the comment will be lost because the inner
-function `g` (which is the AST node to which the comment is attached to) is
-discarded by the compressor as not referenced.
-
-The safest comments where to place copyright information (or other info that
-needs to be kept in the output) are comments attached to toplevel nodes.
-
-### The `unsafe` `compress` option
-
-It enables some transformations that *might* break code logic in certain
-contrived cases, but should be fine for most code.  You might want to try it
-on your own code, it should reduce the minified size.  Here's what happens
-when this flag is on:
-
-- `new Array(1, 2, 3)` or `Array(1, 2, 3)` → `[ 1, 2, 3 ]`
-- `new Object()` → `{}`
-- `String(exp)` or `exp.toString()` → `"" + exp`
-- `new Object/RegExp/Function/Error/Array (...)` → we discard the `new`
-
-### Conditional compilation
-
-You can use the `--define` (`-d`) switch in order to declare global
-variables that UglifyJS will assume to be constants (unless defined in
-scope).  For example if you pass `--define DEBUG=false` then, coupled with
-dead code removal UglifyJS will discard the following from the output:
-```javascript
-if (DEBUG) {
-    console.log("debug stuff");
-}
-```
-
-You can specify nested constants in the form of `--define env.DEBUG=false`.
-
-UglifyJS will warn about the condition being always false and about dropping
-unreachable code; for now there is no option to turn off only this specific
-warning, you can pass `warnings=false` to turn off *all* warnings.
-
-Another way of doing that is to declare your globals as constants in a
-separate file and include it into the build.  For example you can have a
-`build/defines.js` file with the following:
-```javascript
-var DEBUG = false;
-var PRODUCTION = true;
-// etc.
-```
-
-and build your code like this:
-
-    uglifyjs build/defines.js js/foo.js js/bar.js... -c
-
-UglifyJS will notice the constants and, since they cannot be altered, it
-will evaluate references to them to the value itself and drop unreachable
-code as usual.  The build will contain the `const` declarations if you use
-them. If you are targeting < ES6 environments which does not support `const`,
-using `var` with `reduce_vars` (enabled by default) should suffice.
-
-### Conditional compilation API
-
-You can also use conditional compilation via the programmatic API. With the difference that the
-property name is `global_defs` and is a compressor property:
-
-```javascript
-var result = UglifyJS.minify(fs.readFileSync("input.js", "utf8"), {
-    compress: {
-        dead_code: true,
-        global_defs: {
-            DEBUG: false
-        }
-    }
-});
-```
-
-To replace an identifier with an arbitrary non-constant expression it is
-necessary to prefix the `global_defs` key with `"@"` to instruct UglifyJS
-to parse the value as an expression:
-```javascript
-UglifyJS.minify("alert('hello');", {
-    compress: {
-        global_defs: {
-            "@alert": "console.log"
-        }
-    }
-}).code;
-// returns: 'console.log("hello");'
-```
-
-Otherwise it would be replaced as string literal:
-```javascript
-UglifyJS.minify("alert('hello');", {
-    compress: {
-        global_defs: {
-            "alert": "console.log"
-        }
-    }
-}).code;
-// returns: '"console.log"("hello");'
-```
-
-### Using native Uglify AST with `minify()`
-```javascript
-// example: parse only, produce native Uglify AST
-
-var result = UglifyJS.minify(code, {
-    parse: {},
-    compress: false,
-    mangle: false,
-    output: {
-        ast: true,
-        code: false  // optional - faster if false
-    }
-});
-
-// result.ast contains native Uglify AST
-```
-```javascript
-// example: accept native Uglify AST input and then compress and mangle
-//          to produce both code and native AST.
-
-var result = UglifyJS.minify(ast, {
-    compress: {},
-    mangle: {},
-    output: {
-        ast: true,
-        code: true  // optional - faster if false
-    }
-});
-
-// result.ast contains native Uglify AST
-// result.code contains the minified code in string form.
-```
-
-### Working with Uglify AST
-
-Transversal and transformation of the native AST can be performed through
-[`TreeWalker`](https://github.com/mishoo/UglifyJS2/blob/master/lib/ast.js) and
-[`TreeTransformer`](https://github.com/mishoo/UglifyJS2/blob/master/lib/transform.js)
-respectively.
-
-### ESTree / SpiderMonkey AST
-
-UglifyJS has its own abstract syntax tree format; for
-[practical reasons](http://lisperator.net/blog/uglifyjs-why-not-switching-to-spidermonkey-ast/)
-we can't easily change to using the SpiderMonkey AST internally.  However,
-UglifyJS now has a converter which can import a SpiderMonkey AST.
-
-For example [Acorn][acorn] is a super-fast parser that produces a
-SpiderMonkey AST.  It has a small CLI utility that parses one file and dumps
-the AST in JSON on the standard output.  To use UglifyJS to mangle and
-compress that:
-
-    acorn file.js | uglifyjs -p spidermonkey -m -c
-
-The `-p spidermonkey` option tells UglifyJS that all input files are not
-JavaScript, but JS code described in SpiderMonkey AST in JSON.  Therefore we
-don't use our own parser in this case, but just transform that AST into our
-internal AST.
-
-### Use Acorn for parsing
-
-More for fun, I added the `-p acorn` option which will use Acorn to do all
-the parsing.  If you pass this option, UglifyJS will `require("acorn")`.
-
-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.
-
-[acorn]: https://github.com/ternjs/acorn
-[sm-spec]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k
-
-### Uglify Fast Minify Mode
-
-It's not well known, but whitespace removal and symbol mangling accounts
-for 95% of the size reduction in minified code for most JavaScript - not
-elaborate code transforms. One can simply disable `compress` to speed up
-Uglify builds by 3 to 4 times. In this fast `mangle`-only mode Uglify has
-comparable minify speeds and gzip sizes to
-[`butternut`](https://www.npmjs.com/package/butternut):
-
-| d3.js | minify size | gzip size | minify time (seconds) |
-| --- | ---: | ---: | ---: |
-| original | 451,131 | 108,733 | - |
-| uglify-js@3.0.24 mangle=false, compress=false | 316,600 | 85,245 | 0.70 |
-| uglify-js@3.0.24 mangle=true, compress=false | 220,216 | 72,730 | 1.13 |
-| butternut@0.4.6 | 217,568 | 72,738 | 1.41 |
-| uglify-js@3.0.24 mangle=true, compress=true | 212,511 | 71,560 | 3.36 |
-| babili@0.1.4 | 210,713 | 72,140 | 12.64 |
-
-To enable fast minify mode from the CLI use:
-```
-uglifyjs file.js -m
-```
-To enable fast minify mode with the API use:
-```js
-UglifyJS.minify(code, { compress: false, mangle: true });
-```
-
-#### Source maps and debugging
-
-Various `compress` transforms that simplify, rearrange, inline and remove code
-are known to have an adverse effect on debugging with source maps. This is
-expected as code is optimized and mappings are often simply not possible as
-some code no longer exists. For highest fidelity in source map debugging
-disable the Uglify `compress` option and just use `mangle`.
-
-### Compiler assumptions
-
-To allow for better optimizations, the compiler makes various assumptions:
-
-- `.toString()` and `.valueOf()` don't have side effects, and for built-in
-  objects they have not been overridden.
-- `undefined`, `NaN` and `Infinity` have not been externally redefined.
-- `arguments.callee`, `arguments.caller` and `Function.prototype.caller` are not used.
-- The code doesn't expect the contents of `Function.prototype.toString()` or
-  `Error.prototype.stack` to be anything in particular.
-- Getting and setting properties on a plain object does not cause other side effects
-  (using `.watch()` or `Proxy`).
-- Object properties can be added, removed and modified (not prevented with
-  `Object.defineProperty()`, `Object.defineProperties()`, `Object.freeze()`,
-  `Object.preventExtensions()` or `Object.seal()`).