## What is the Closure Compiler?


The Closure Compiler is a tool for making JavaScript download and run
faster. Instead of compiling
from a source language to machine code, it compiles from JavaScript to
better JavaScript. It parses your JavaScript, analyzes it, removes
dead code and rewrites and minimizes what's left. It also checks
syntax, variable references, and types, and warns about common
JavaScript pitfalls.

## How can I use the Closure Compiler?


You can use the Closure Compiler as:
- An open source Java application that you can run from the command line.
- A library you can depend on via Bazel.
- An NPM package
- To get started with the compiler, see "How do I start" below.

## What are the benefits of using Closure Compiler?

  - **Efficiency.** The Closure Compiler reduces the size of
    your JavaScript files and makes them more efficient, helping your
    application to load faster and reducing your bandwidth needs.

  - **Code checking.** The Closure Compiler provides warnings
    for illegal JavaScript and warnings for potentially dangerous
    operations, helping you to produce JavaScript that is less buggy and
    easier to maintain.

    ## How do I start?


    - Download the most recently released JAR file from the [Maven repository](https://mvnrepository.com/artifact/com.google.javascript/closure-compiler).
    - Work through the [Application
      Hello World](https://developers.google.com/closure/compiler/docs/gettingstarted_app).
    - Read about [Advanced
      compilation](https://developers.google.com/closure/compiler/docs/api-tutorial3).
    - Explore [the project's source code](https://github.com/google/closure-compiler).

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