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.
The Closure Compiler is a tool for making. JavaScript does not compile JavaScript, but rather compiles 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 some ECMAScript 6 code to ECMAScript 3, so it can not be used. The Closure source code can be compiled in three ways:
Programming languages that transpire to JavaScript benefit from Closure Tools. For example, Closure Compiler helps to make ClojureScript by JavaScript code more efficient.
The Closure Library is a JavaScript library, built specifically for a 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 as User Interface widgets and Controls.
Closure Templates are a templating system for dynamic 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”.
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.