Options

This task primarily delegates to UglifyJS2, so please consider the UglifyJS documentation as required reading for advanced configuration.

mangle

Type: Boolean Object Default: {}

Turn on or off mangling with default options. If an Object is specified, it is passed directly to ast.mangle_names() and ast.compute_char_frequency() (mimicking command line behavior).

compress

Type: Boolean Object Default: {}

Turn on or off source compression with default options. If an Object is specified, it is passed as options to UglifyJS.Compressor().

beautify

Type: Boolean Object Default: false

Turns on beautification of the generated source code. An Object will be merged and passed with the options sent to UglifyJS.OutputStream()

report

Choices: false 'min' 'gzip' Default: false

Either do not report anything, report only minification result, or report minification and gzip results. This is useful to see exactly how well Uglify is performing, but using 'gzip' can add 5-10x runtime task execution.

Example ouput using 'gzip':

Original: 198444 bytes.
Minified: 101615 bytes.
Gzipped:  20084 bytes.

sourceMap

Type: String Function Default: undefined

The location to output the sourcemap. If a function is provided, the uglify destination is passed as the argument and the return value will be used as the sourceMap name.

sourceMapRoot

Type: String Default: undefined

The location where your source files can be found. This sets the sourceRoot field in the source map.

sourceMapIn

Type: String Function Default: undefined

The location of an input source map from an earlier compilation, e.g. from CoffeeScript. If a function is provided, the uglify source is passed as the argument and the return value will be used as the sourceMap name. This only makes sense when there's one source file.

sourceMappingURL

Type: String Function Default: undefined

The location of your sourcemap. Defaults to the location you use for sourceMap, override if you need finer control. Provide a function to dynamically generate the sourceMappingURL based off the destination.

sourceMapPrefix

Type: Number Default: undefined

The number of directories to drop from the path prefix when declaring files in the source map.

enclose

Type: Object Default: undefined

Wrap all of the code in a closure with a configurable arguments/parameters list. Each key-value pair in the enclose object is effectively an argument-parameter pair.

wrap

Type: String Default: undefined

Wrap all of the code in a closure, an easy way to make sure nothing is leaking. For variables that need to be public exports and global variables are made available. The value of wrap is the global variable exports will be available as.

exportAll

Type: Boolean Default: false

When using wrap this will make all global functions and variables available via the export variable.

preserveComments

Type: Boolean String Function Default: undefined Options: false 'all' 'some'

Turn on preservation of comments.

• false will strip all comments
• 'all' will preserve all comments in code blocks that have not been squashed or dropped
• 'some' will preserve all comments that start with a bang (!) or include a closure compiler style directive (@preserve @license @cc_on)
• Function specify your own comment preservation function. You will be passed the current node and the current comment and are expected to return either true or false

banner

Type: String Default: empty string

This string will be prepended to the beginning of the minified output. It is processed using grunt.template.process, using the default options.

footer

Type: String Default: empty string

This string will be append to the end of the minified output. It is processed using grunt.template.process, using the default options.

(Default processing options are explained in the grunt.template.process documentation)