jekyll-js-minify-plugin

A Jekyll plugin that automatically minifies all Javascript files using the Google Closure Compiler

Usage

gem install 'closure-compiler'
cp jsminify.rb YOUR_JEKYLL_DIR/_plugins/

That's it. All files ending in .js will be minified. Files ending in .min.js will be skipped. It's almost magical.

Enable ADVANCED_OPTIMIZATIONS

Jsminify can be configured to use closure compiler's ADVANCED_OPTIMIZATIONS globally or on file to file basis. Just add something similiar to your _config.yml:

jsminify:
    # enable/disable advanced_optimizations globally - file specific configuration takes precedence
    # default: false
    advanced_optimizations: false
    
    # file specific configuration - file name must match exactly
    some_file.js:
        # overwrite global advanced_optimizations property
        advanced_optimizations: true
        
        # select externs declarations to be used for this file (see closure compiler documentation)
        # this can't be configured globally
        # default: none
        externs:
            - path/to/externs.js
            - other/path/to/externs.js
    
    some_other_file.js:
        advanced_optimizations: true
        externs:
            - path/to/externs.js