$ npm install google-closure-compiler
Check, compile, optimize and compress Javascript with Closure-Compiler
This repository tracks issues related to the publication to npmjs.org and associated plugins. Any bugs not related to the plugins themselves should be reported to the main repository.
If you are new to Closure-Compiler, make sure to read and understand the compilation levels as the compiler works very differently depending on the compilation level selected.
For help or questions with the compiler, the best resource is Stack Overflow. Posts there are monitored by multiple Closure Compiler team members.
You may also post in the Closure Compiler Discuss Google Group.
Please don't cross post to both Stackoverflow and Closure Compiler Discuss.
The compiler is distributed as a Java jar or as a JavaScript library.
Requires java to be installed and in the path. Using the java version typically results in faster compilation times.
This is a transpiled version of the Java source to native JavaScript. It can be used in environments without java installed and even in a browser.
Note: not all flags are available for the JavaScript version.
The simplest way to invoke the compiler (e.g. if you're just trying it out) is with npx
:
npx google-closure-compiler --js=my_program.js --js_output_file=out.js
npm install --save google-closure-compiler
See the full list of compiler flags.
The build tool plugins take options objects. The option parameters map directly to the compiler flags without the leading '--' characters. You may also use camelCase option names.
Values are either strings or booleans. Options which have multiple values can be arrays.
{
js: ['/file-one.js', '/file-two.js'],
compilation_level: 'ADVANCED',
js_output_file: 'out.js',
debug: true
}
For the java version, some shells (particularly windows) try to do expansion on globs rather than passing the string on to the compiler. To prevent this it is necessary to quote certain arguments:
{
js: '"my/quoted/glob/**.js"',
compilation_level: 'ADVANCED',
js_output_file: 'out.js',
debug: true
}
The compiler package also includes build tool plugins for Grunt and Gulp. There is also an official webpack plugin.
Override the path before first use.
const Compiler = require('google-closure-compiler');
Compiler.prototype.javaPath = '/node_modules/MODULE_NAME/jre/jre1.8.0_131.jre/Contents/Home/bin/java';
const compiler = new Compiler({args});
This gets around the long startup time of Google Closure Compiler using Nailgun, which runs a single java process in the background and keeps all of the classes loaded.
First you need to install closure-gun by running the following command.
npm install closure-gun
Then point the package to use closure-gun rather than the JDK.
const compilerPackage = require('google-closure-compiler');
compilerPackage.compiler.JAR_PATH = undefined;
compilerPackage.compiler.prototype.javaPath = './node_modules/.bin/closure-gun'
Note that when using gulp, Only invocations without gulp.src work with nailgun.
A low-level node class is included to facilitate spawning the compiler jar as a process from Node. In addition, it exposes a static property with the path to the compiler jar file.
const ClosureCompiler = require('google-closure-compiler').compiler;
console.log(ClosureCompiler.COMPILER_PATH); // absolute path the compiler jar
console.log(ClosureCompiler.CONTRIB_PATH); // absolute path the contrib folder which contains
const closureCompiler = new ClosureCompiler({
js: 'file-one.js',
compilation_level: 'ADVANCED'
});
const compilerProcess = closureCompiler.run(function(exitCode, stdOut, stdErr) {
//compilation complete
});
const ClosureCompiler = require('google-closure-compiler').jsCompiler;
console.log(ClosureCompiler.CONTRIB_PATH); // absolute path the contrib folder which contains
const closureCompiler = new ClosureCompiler({
compilation_level: 'ADVANCED'
});
const compilerProcess = closureCompiler.run(function(exitCode, stdOut, stdErr) {
//compilation complete
}, [{
path: 'file-one.js',
src: 'alert("hello world")',
sourceMap: null // optional input source map
}]);
Copyright 2015 The Closure Compiler Authors
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Closure Compiler release notes can be found on the main repository wiki.
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