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# globals [](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. | |
## License | |
MIT © [Sindre Sorhus](https://sindresorhus.com) | |