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Google Closure Tools

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Google Closure Tools is a set of tools to help developers build rich web applications with JavaScript It was developed by Google for use in their web applications such as Gmail, Google Docs and Google Maps


  • 1 Closure Compiler
    • 11 Ecosystem
  • 2 Closure Library
  • 3 Closure Templates
  • 4 Closure Stylesheets
  • 5 See also
  • 6 References
  • 7 External links

Closure Compiler

The Closure Compiler is a tool for making JavaScript download and run faster, at the expense of human readability It does not compile from JavaScript to machine code, but rather compiles from JavaScript to more efficient JavaScript It parses JavaScript, analyzes it, removes dead code and rewrites and minifies what's left It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls It supports transpiling some ECMAScript 6 code to ECMAScript 3, so that programmers can write JavaScript that uses those features, and run it in browsers or other environments that don't yet support them The Traceur Compiler is another Google project that supports transpiling ES6 to ES3 Closure source code can be compiled in three ways:

  • From the command line:
    • Java application that can be passed the list of JavaScript files to be compiled
    • npm package google-closure-compiler-js no Java dependencies
  • Interactively in the browser:
    • The Closure Compiler service website provides a form for a user to input a URL pointing to a JavaScript source or enter JavaScript source code in a textbox The website will display with the optimized JavaScript on right side for the user to copy
    • The Closure Compiler server accepts HTTP POST requests Parameters include the string of JavaScript to be optimized or a URL pointing to it, the optimization level, whether to include errors and warnings, and the output format JSON, XML, or text

The Closure compiler also supports type checking via type annotations that must be written in JSDoc comments


Programming languages that transpile to JavaScript benefit from Closure Tools For example, Closure Compiler helps to make ClojureScript practical by making the compiled JavaScript code more efficient

Closure Library

The Closure Library is a JavaScript library, written specifically to take advantage of the Closure Compiler, based on a modular architecture It provides cross-browser functions for DOM manipulations and events, Ajax and JSON, as well as more high-level objects such as User Interface widgets and Controls

Closure Templates

Closure Templates are a templating system for dynamically generating HTML in both Java and JavaScript

Because the language was apparently referred to as "Soy" internal to Google, and "Soy" remains in some of the documentation and classes, sometimes Closure Templates are referred to as "Soy Templates"

Closure Stylesheets

This is a compiler which provides an extended version of CSS, which is compiled down to ordinary CSS Internally in Google, this extended version of CSS is referred to as GSS

See also

  • Free software portal
  • Google Web Toolkit
  • JSDoc
  • TypeScript


  1. ^ http://googlecodeblogspotcom/2009/11/introducing-closure-toolshtml
  2. ^ https://githubcom/google/closure-compiler/wiki/Releases
  3. ^ Bolin, Michael, "Closure: The Definitive Guide", O'Reilly Media Inc, Sebastopol, CA, 2010
  4. ^ https://developersgooglecom/closure/faq#gwt
  5. ^ "Annotating JavaScript for the Closure Compiler" 
  6. ^ "Motivations for using Google's Closure Tools" 
  7. ^ https://codegooglecom/closure/templates/docs/helloworld_javahtml
  8. ^ https://codegooglecom/closure/templates/docs/helloworld_jshtml JavaScript
  9. ^ https://codegooglecom/p/closure-templates/source/browse/trunk/javascript/soyutilsjs

External links

  • Official website
  • Package for TYPO3 Flow
  • Appmd: Python development sample project App Engine/django/Google Closure/Endpoints/Material design

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Google Closure Tools

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