# globals
> Global identifiers from different JavaScript environments
It's just a [JSON file](globals.json), so use it in any environment.
This package is used by ESLint.
**This package [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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