gulp-closure-compiler

Gulp plugin for Google Closure Compiler

Issues with the output or Java should be reported on the Closure Compiler issue tracker.

Install

npm install --save-dev gulp-closure-compiler

Example

Simple optimizations

Simple optimizations for classic minifying.

var gulp = require('gulp');
var closureCompiler = require('gulp-closure-compiler');

gulp.task('default', function() {
  gulp.src('src/*.js')
    .pipe(closureCompiler({
      compilerPath: 'bower_components/closure-compiler/compiler.jar',
      fileName: 'build.js'
    }))
    .pipe(gulp.dest('dist'));
});

Advanced optimizations

Advanced optimizations is much more aggressive. It's aimed for libraries like Closure Library.

var gulp = require('gulp');
var closureCompiler = require('gulp-closure-compiler');

gulp.task('default', function() {
  gulp.src('src/*.js')
    .pipe(closureCompiler({
      compilerPath: 'bower_components/closure-compiler/compiler.jar',
      fileName: 'build.js',
      compilerFlags: {
        closure_entry_point: 'app.main',
        compilation_level: 'ADVANCED_OPTIMIZATIONS',
        define: [
          "goog.DEBUG=false"
        ],
        externs: [
          'bower_components/este-library/externs/react.js'
        ],
        extra_annotation_name: 'jsx',
        // Some compiler flags (like --use_types_for_optimization) don't have value. Use null.
        // use_types_for_optimization: null,
        only_closure_dependencies: true,
        output_wrapper: '(function(){%output%})();',
        warning_level: 'VERBOSE'
      }
    }))
    .pipe(gulp.dest('dist'));
});

API

closureCompiler(options)

options

fileName

Type: String
Required

Generated file name.

compilerPath

Type: String
Required

Path to compiler.jar

compilerFlags

Type: Object

Closure compiler flags.

maxBuffer

Type: Number

If the buffer returned by closure compiler is more than 1000kb, you will get an error saying "maxBuffer exceeded". To prevent this, you can set the maxBuffer to the preffered size you want (in kb).

How to download Closure Compiler

Use Bower.

{
  "name": "foo",
  "version": "0.0.0",
  "dependencies": {
    "closure-compiler": "http://dl.google.com/closure-compiler/compiler-latest.zip"
  }
}

Implementation notes

Closure compiler supports pipes, but not correctly (issue).
You don't need closurebuilder.py script, compiler knows how to resolve dependencies.
Java 1.7+ is required.

fnatte/gulp-closure-compiler