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().

sourceMap

Type: String
Default: undefined

Specify the location to output the source map.

sourceMapRoot

Type: String
Default: undefined

The location where your source files can be found.

sourceMapIn

Type: String
Default: undefined

The location of an input source map from an earlier compilation, e.g. from CoffeeScript.

sourceMappingURL

Type: String
Default: undefined

The location of your sourcemap. Defaults to the location you use for sourceMap, override if you need finer control

sourceMapPrefix

Type: Number
Default: undefined

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

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.

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