An sbt-web plugin to perform UglifyJS optimization on the asset pipeline.
To use this plugin, use the addSbtPlugin command within your project's project/plugins.sbt file:
addSbtPlugin("com.github.sbt" % "sbt-uglify" % "3.0.0")
Your project's build file also needs to enable sbt-web plugins. For example, with build.sbt:
lazy val root = (project in file(".")).enablePlugins(SbtWeb)
As with all sbt-web asset pipeline plugins you must declare their order of execution:
pipelineStages := Seq(uglify)
A standard build profile for the Uglify optimizer is provided which will mangle variables for obfuscation and compression. Each input .js file found in your assets folders will have a corresponding .min.js file and source maps will also be generated.
If you wish to limit or extend what is uglified then you can use filters:
uglify / includeFilter := GlobFilter("myjs/*.js"),
...where the above will include only those files under the myjs folder.
The sbt excludeFilter is also available to the uglify scope and defaults to excluding the public folder and extracted Webjars.
If you wish to change how files are mapped from input to output, you can change the uglifyOps setting to point at another grouping.
The default ops takes a source file and produces minified file and source map:
uglifyOps := UglifyOps.singleFileWithSourceMapOut
This ops takes a source file and produces minified file only (no source map):
uglifyOps := UglifyOps.singleFile
This ops takes a source file and source map and produces minified file and combined source map. Your includeFilter must include source map files for this to work:
uglifyOps := UglifyOps.singleFileWithSourceMapInAndOut
You are able to use and/or customize settings already made, and add your own. Here are a list of relevant settings and their meanings (please refer to the UglifyJS documentation for details on the options):
Option Description Default uglifyComments Specifies comments handling.None uglifyCompress Enables compression. Set true to compress. true uglifyCompressOptions A sequence of options for compression such as hoist_vars, if_return etc. Nil uglifyDefine Define globals. None uglifyEnclose Enclose in one big function. false uglifyIncludeSource Include the content of source files in the source map as the sourcesContent property. false uglifyMangle Enables name mangling. true uglifyMangleOptions Options for mangling such as sort, topLevel etc. Nil uglifyPreamble Any preamble to include at the start of the output. None uglifyReserved Reserved names to exclude from mangling. Nil uglifyOps A function defining how to combine input files into output files. UglifyOps.singleFileWithSourceMapOut
The plugin is built on top of JavaScript Engine which supports different JavaScript runtimes.
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