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node_modules/transformers/node_modules/uglify-js/README.md

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+UglifyJS 2
+==========
+
+UglifyJS is a JavaScript parser, minifier, compressor or beautifier toolkit.
+
+This page documents the command line utility.  For
+[API and internals documentation see my website](http://lisperator.net/uglifyjs/).
+There's also an
+[in-browser online demo](http://lisperator.net/uglifyjs/#demo) (for Firefox,
+Chrome and probably Safari).
+
+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
+
+From Git:
+
+    git clone git://github.com/mishoo/UglifyJS2.git
+    cd UglifyJS2
+    npm link .
+
+Usage
+-----
+
+    uglifyjs [input files] [options]
+
+UglifyJS2 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 you want to read from STDIN instead, pass a single dash instead of input
+files.
+
+The available options are:
+
+    --source-map       Specify an output file where to generate source map.
+                                                                          [string]
+    --source-map-root  The path to the original source to be included in the
+                       source map.                                        [string]
+    --source-map-url   The path to the source map to be added in //@
+                       sourceMappingURL.  Defaults to the value passed with
+                       --source-map.                                      [string]
+    --in-source-map    Input source map, useful if you're compressing JS that was
+                       generated from some other original code.
+    -p, --prefix       Skip prefix for original filenames that appear in source
+                       maps. For example -p 3 will drop 3 directories from file
+                       names and ensure they are relative paths.
+    -o, --output       Output file (default STDOUT).
+    -b, --beautify     Beautify output/specify output options.            [string]
+    -m, --mangle       Mangle names/pass mangler options.                 [string]
+    -r, --reserved     Reserved names to exclude from mangling.
+    -c, --compress     Enable compressor/pass compressor options. Pass options
+                       like -c hoist_vars=false,if_return=false. Use -c with no
+                       argument to use the default compression options.   [string]
+    -d, --define       Global definitions                                 [string]
+    --comments         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 (needs to start with a slash) to keep
+                       only comments that match.
+                       Note that currently not *all* comments can be kept when
+                       compression is on, because of dead code removal or
+                       cascading statements into sequences.               [string]
+    --stats            Display operations run time on STDERR.            [boolean]
+    --acorn            Use Acorn for parsing.                            [boolean]
+    --spidermonkey     Assume input fles are SpiderMonkey AST format (as JSON).
+                                                                         [boolean]
+    --self             Build itself (UglifyJS2) as a library (implies
+                       --wrap=UglifyJS --export-all)                     [boolean]
+    --wrap             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.
+                                                                          [string]
+    --export-all       Only used when --wrap, this tells UglifyJS to add code to
+                       automatically export all globals.                 [boolean]
+    --lint             Display some scope warnings                       [boolean]
+    -v, --verbose      Verbose                                           [boolean]
+    -V, --version      Print version number and exit.                    [boolean]
+
+Specify `--output` (`-o`) to declare the output file.  Otherwise the output
+goes to STDOUT.
+
+## Source map options
+
+UglifyJS2 can generate a source map file, which is highly useful for
+debugging your compressed JavaScript.  To get a source map, pass
+`--source-map output.js.map` (full path to the file where you want the
+source map dumped).
+
+Additionally you might need `--source-map-root` to pass the URL where the
+original files can be found.  In case you are passing full paths to input
+files to UglifyJS, you can use `--prefix` (`-p`) to specify the number of
+directories to drop from the path prefix when declaring files in the source
+map.
+
+For example:
+
+    uglifyjs /home/doe/work/foo/src/js/file1.js \
+             /home/doe/work/foo/src/js/file2.js \
+             -o foo.min.js \
+             --source-map foo.min.js.map \
+             --source-map-root http://foo.com/src \
+             -p 5 -c -m
+
+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 you need to pass `--in-source-map
+/path/to/input/source.map`.  Normally the input source map should also point
+to the file containing the generated JS, so if that's correct you can omit
+input files from the command line.
+
+## Mangler options
+
+To enable the mangler you need to pass `--mangle` (`-m`).  Optionally you
+can pass `-m sort=true` (we'll possibly have other flags in the future) in order
+to assign shorter names to most frequently used variables.  This saves a few
+hundred bytes on jQuery before gzip, but the output is _bigger_ after gzip
+(and seems to happen for other libraries I tried it on) therefore it's not
+enabled by default.
+
+When mangling is enabled but you want to prevent certain names from being
+mangled, you can declare those names with `--reserved` (`-r`) — pass a
+comma-separated list of names.  For example:
+
+    uglifyjs ... -m -r '$,require,exports'
+
+to prevent the `require`, `exports` and `$` names from being changed.
+
+## Compressor options
+
+You need to pass `--compress` (`-c`) to enable the compressor.  Optionally
+you can pass a comma-separated list of 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`).
+
+The defaults should be tuned for maximum compression on most code.  Here are
+the available options (all are `true` by default, except `hoist_vars`):
+
+- `sequences` -- join consecutive simple statements using the comma operator
+- `properties` -- rewrite property access using the dot notation, for
+  example `foo["bar"] → foo.bar`
+- `dead_code` -- remove unreachable code
+- `drop_debugger` -- remove `debugger;` statements
+- `unsafe` -- apply "unsafe" transformations (discussion below)
+- `conditionals` -- apply optimizations for `if`-s and conditional
+  expressions
+- `comparisons` -- apply certain optimizations to binary nodes, for example:
+  `!(a <= b) → a > b` (only when `unsafe`), attempts to negate binary nodes,
+  e.g. `a = !b && !c && !d && !e → a=!(b||c||d||e)` etc.
+- `evaluate` -- attempt to evaluate constant expressions
+- `booleans` -- various optimizations for boolean context, for example `!!a
+  ? b : c → a ? b : c`
+- `loops` -- optimizations for `do`, `while` and `for` loops when we can
+  statically determine the condition
+- `unused` -- drop unreferenced functions and variables
+- `hoist_funs` -- hoist function declarations
+- `hoist_vars` -- hoist `var` declarations (this is `false` by default
+  because it seems to increase the size of the output in general)
+- `if_return` -- optimizations for if/return and if/continue
+- `join_vars` -- join consecutive `var` statements
+- `cascade` -- small optimization for sequences, transform `x, x` into `x`
+  and `x = something(), x` into `x = something()`
+- `warnings` -- display warnings when dropping unreachable code or unused
+  declarations etc.
+
+### 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:
+
+    if (DEBUG) {
+        console.log("debug stuff");
+    }
+
+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:
+
+    const DEBUG = false;
+    const 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 possible downside of this approach is that the build
+will contain the `const` declarations.
+
+<a name="codegen-options"></a>
+## Beautifier 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:
+
+- `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.
+- `indent-level` (default 4)
+- `indent-start` (default 0) -- prefix all lines by that many spaces
+- `quote-keys` (default `false`) -- pass `true` to quote all keys in literal
+  objects
+- `space-colon` (default `true`) -- insert a space after the colon signs
+- `ascii-only` (default `false`) -- escape Unicode characters in strings and
+  regexps
+- `inline-script` (default `false`) -- escape the slash in occurrences of
+  `</script` in strings
+- `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.
+- `max-line-len` (default 32000) -- maximum line length (for uglified code)
+- `ie-proof` (default `true`) -- generate “IE-proof” code (for now this
+  means add brackets around the do/while in code like this: `if (foo) do
+  something(); while (bar); else ...`.
+- `bracketize` (default `false`) -- always insert brackets in `if`, `for`,
+  `do`, `while` or `with` statements, even if their body is a single
+  statement.
+- `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).
+
+### 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
+'/foo|bar/'` will keep only comments that contain "foo" or "bar".
+
+Note, however, that there might be situations where comments are lost.  For
+example:
+
+    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.
+
+## Support for the SpiderMonkey AST
+
+UglifyJS2 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 --spidermonkey -m -c
+
+The `--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 `--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.
+
+API Reference
+-------------
+
+Assuming installation via NPM, you can load UglifyJS in your application
+like this:
+
+    var UglifyJS = require("uglify-js");
+
+It exports a lot of names, but I'll discuss here the basics that are needed
+for parsing, mangling and compressing a piece of code.  The sequence is (1)
+parse, (2) compress, (3) mangle, (4) generate output code.
+
+### The simple way
+
+There's a single toplevel function which combines all the steps.  If you
+don't need additional customization, you might want to go with `minify`.
+Example:
+
+    var result = UglifyJS.minify("/path/to/file.js");
+    console.log(result.code); // minified output
+    // if you need to pass code instead of file name
+    var result = UglifyJS.minify("var b = function () {};", {fromString: true});
+
+You can also compress multiple files:
+
+    var result = UglifyJS.minify([ "file1.js", "file2.js", "file3.js" ]);
+    console.log(result.code);
+
+To generate a source map:
+
+    var result = UglifyJS.minify([ "file1.js", "file2.js", "file3.js" ], {
+        outSourceMap: "out.js.map"
+    });
+    console.log(result.code); // minified output
+    console.log(result.map);
+
+Note that the source map is not saved in a file, it's just returned in
+`result.map`.  The value passed for `outSourceMap` is only used to set the
+`file` attribute in the source map (see [the spec][sm-spec]).
+
+You can also specify sourceRoot property to be included in source map:
+
+    var result = UglifyJS.minify([ "file1.js", "file2.js", "file3.js" ], {
+        outSourceMap: "out.js.map",
+        sourceRoot: "http://example.com/src"
+    });
+
+
+If you're compressing compiled JavaScript and have a source map for it, you
+can use the `inSourceMap` argument:
+
+    var result = UglifyJS.minify("compiled.js", {
+        inSourceMap: "compiled.js.map",
+        outSourceMap: "minified.js.map"
+    });
+    // same as before, it returns `code` and `map`
+
+The `inSourceMap` is only used if you also request `outSourceMap` (it makes
+no sense otherwise).
+
+Other options:
+
+- `warnings` (default `false`) — pass `true` to display compressor warnings.
+
+- `fromString` (default `false`) — if you pass `true` then you can pass
+  JavaScript source code, rather than file names.
+
+- `mangle` — pass `false` to skip mangling names.
+
+- `output` (default `null`) — pass an object if you wish to specify
+  additional [output options][codegen].  The defaults are optimized
+  for best compression.
+
+- `compress` (default `{}`) — pass `false` to skip compressing entirely.
+  Pass an object to specify custom [compressor options][compressor].
+
+We could add more options to `UglifyJS.minify` — if you need additional
+functionality please suggest!
+
+### The hard way
+
+Following there's more detailed API info, in case the `minify` function is
+too simple for your needs.
+
+#### The parser
+
+    var toplevel_ast = UglifyJS.parse(code, options);
+
+`options` is optional and if present it must be an object.  The following
+properties are available:
+
+- `strict` — disable automatic semicolon insertion and support for trailing
+  comma in arrays and objects
+- `filename` — the name of the file where this code is coming from
+- `toplevel` — a `toplevel` node (as returned by a previous invocation of
+  `parse`)
+
+The last two options are useful when you'd like to minify multiple files and
+get a single file as the output and a proper source map.  Our CLI tool does
+something like this:
+
+    var toplevel = null;
+    files.forEach(function(file){
+        var code = fs.readFileSync(file);
+        toplevel = UglifyJS.parse(code, {
+            filename: file,
+            toplevel: toplevel
+        });
+    });
+
+After this, we have in `toplevel` a big AST containing all our files, with
+each token having proper information about where it came from.
+
+#### Scope information
+
+UglifyJS contains a scope analyzer that you need to call manually before
+compressing or mangling.  Basically it augments various nodes in the AST
+with information about where is a name defined, how many times is a name
+referenced, if it is a global or not, if a function is using `eval` or the
+`with` statement etc.  I will discuss this some place else, for now what's
+important to know is that you need to call the following before doing
+anything with the tree:
+
+    toplevel.figure_out_scope()
+
+#### Compression
+
+Like this:
+
+    var compressor = UglifyJS.Compressor(options);
+    var compressed_ast = toplevel.transform(compressor);
+
+The `options` can be missing.  Available options are discussed above in
+“Compressor options”.  Defaults should lead to best compression in most
+scripts.
+
+The compressor is destructive, so don't rely that `toplevel` remains the
+original tree.
+
+#### Mangling
+
+After compression it is a good idea to call again `figure_out_scope` (since
+the compressor might drop unused variables / unreachable code and this might
+change the number of identifiers or their position).  Optionally, you can
+call a trick that helps after Gzip (counting character frequency in
+non-mangleable words).  Example:
+
+    compressed_ast.figure_out_scope();
+    compressed_ast.compute_char_frequency();
+    compressed_ast.mangle_names();
+
+#### Generating output
+
+AST nodes have a `print` method that takes an output stream.  Essentially,
+to generate code you do this:
+
+    var stream = UglifyJS.OutputStream(options);
+    compressed_ast.print(stream);
+    var code = stream.toString(); // this is your minified code
+
+or, for a shortcut you can do:
+
+    var code = compressed_ast.print_to_string(options);
+
+As usual, `options` is optional.  The output stream accepts a lot of otions,
+most of them documented above in section “Beautifier options”.  The two
+which we care about here are `source_map` and `comments`.
+
+#### Keeping comments in the output
+
+In order to keep certain comments in the output you need to pass the
+`comments` option.  Pass a RegExp or a function.  If you pass a RegExp, only
+those comments whose body matches the regexp will be kept.  Note that body
+means without the initial `//` or `/*`.  If you pass a function, it will be
+called for every comment in the tree and will receive two arguments: the
+node that the comment is attached to, and the comment token itself.
+
+The comment token has these properties:
+
+- `type`: "comment1" for single-line comments or "comment2" for multi-line
+  comments
+- `value`: the comment body
+- `pos` and `endpos`: the start/end positions (zero-based indexes) in the
+  original code where this comment appears
+- `line` and `col`: the line and column where this comment appears in the
+  original code
+- `file` — the file name of the original file
+- `nlb` — true if there was a newline before this comment in the original
+  code, or if this comment contains a newline.
+
+Your function should return `true` to keep the comment, or a falsy value
+otherwise.
+
+#### Generating a source mapping
+
+You need to pass the `source_map` argument when calling `print`.  It needs
+to be a `SourceMap` object (which is a thin wrapper on top of the
+[source-map][source-map] library).
+
+Example:
+
+    var source_map = UglifyJS.SourceMap(source_map_options);
+    var stream = UglifyJS.OutputStream({
+        ...
+        source_map: source_map
+    });
+    compressed_ast.print(stream);
+
+    var code = stream.toString();
+    var map = source_map.toString(); // json output for your source map
+
+The `source_map_options` (optional) can contain the following properties:
+
+- `file`: the name of the JavaScript output file that this mapping refers to
+- `root`: the `sourceRoot` property (see the [spec][sm-spec])
+- `orig`: the "original source map", handy when you compress generated JS
+  and want to map the minified output back to the original code where it
+  came from.  It can be simply a string in JSON, or a JSON object containing
+  the original source map.
+
+  [acorn]: https://github.com/marijnh/acorn
+  [source-map]: https://github.com/mozilla/source-map
+  [sm-spec]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit
+  [codegen]: http://lisperator.net/uglifyjs/codegen
+  [compressor]: http://lisperator.net/uglifyjs/compress