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56 lines
2.4 KiB
Markdown
56 lines
2.4 KiB
Markdown
# globals [](https://travis-ci.org/sindresorhus/globals)
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> Global identifiers from different JavaScript environments
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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.
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It's just a [JSON file](globals.json), so use it in whatever environment you like.
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**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).**
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## Install
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```
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$ npm install globals
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```
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## Usage
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```js
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const globals = require('globals');
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console.log(globals.browser);
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/*
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{
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addEventListener: false,
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applicationCache: false,
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ArrayBuffer: false,
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atob: false,
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…
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}
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*/
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```
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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.
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For Node.js this package provides two sets of globals:
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- `globals.nodeBuiltin`: Globals available to all code running in Node.js.
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These will usually be available as properties on the `global` object and include `process`, `Buffer`, but not CommonJS arguments like `require`.
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See: https://nodejs.org/api/globals.html
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- `globals.node`: A combination of the globals from `nodeBuiltin` plus all CommonJS arguments ("CommonJS module scope").
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See: https://nodejs.org/api/modules.html#modules_the_module_scope
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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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---
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<div align="center">
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<b>
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<a href="https://tidelift.com/subscription/pkg/npm-globals?utm_source=npm-globals&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
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</b>
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<br>
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<sub>
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Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
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</sub>
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</div>
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