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# globals [![Build Status](https://travis-ci.org/sindresorhus/globals.svg?branch=master)](https://travis-ci.org/sindresorhus/globals)
> Global identifiers from different JavaScript environments
Extracted from [JSHint](https://github.com/jshint/jshint/blob/3a8efa979dbb157bfb5c10b5826603a55a33b9ad/src/vars.js) and [ESLint](https://github.com/eslint/eslint/blob/b648406218f8a2d7302b98f5565e23199f44eb31/conf/environments.json) and merged.
It's just a [JSON file](globals.json), so use it in whatever environment you like.
**This module [no longer accepts](https://github.com/sindresorhus/globals/issues/82) new environments. If you need it for ESLint, just [create a plugin](http://eslint.org/docs/developer-guide/working-with-plugins#environments-in-plugins).**
## Install
``` $ npm install globals ```
## Usage
```js const globals = require('globals');
console.log(globals.browser); /* { addEventListener: false, applicationCache: false, ArrayBuffer: false, atob: false, … } */ ```
Each global is given a value of `true` or `false`. A value of `true` indicates that the variable may be overwritten. A value of `false` indicates that the variable should be considered read-only. This information is used by static analysis tools to flag incorrect behavior. We assume all variables should be `false` unless we hear otherwise.
For Node.js this package provides two sets of globals:
- `globals.nodeBuiltin`: Globals available to all code running in Node.js. These will usually be available as properties on the `global` object and include `process`, `Buffer`, but not CommonJS arguments like `require`. See: https://nodejs.org/api/globals.html - `globals.node`: A combination of the globals from `nodeBuiltin` plus all CommonJS arguments ("CommonJS module scope"). See: https://nodejs.org/api/modules.html#modules_the_module_scope
When analyzing code that is known to run outside of a CommonJS wrapper, for example, JavaScript modules, `nodeBuiltin` can find accidental CommonJS references.
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