45 lines
1.6 KiB
Markdown
45 lines
1.6 KiB
Markdown
# 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
|
|
|
|
```sh
|
|
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.
|