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48 lines
2.4 KiB
48 lines
2.4 KiB
# util [](https://travis-ci.org/browserify/node-util)
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> Node.js's [util][util] module for all engines.
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This implements the Node.js [`util`][util] module for environments that do not have it, like browsers.
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## Install
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You usually do not have to install `util` yourself. If your code runs in Node.js, `util` is built in. If your code runs in the browser, bundlers like [browserify](https://github.com/browserify/browserify) or [webpack](https://github.com/webpack/webpack) also include the `util` module.
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But if none of those apply, with npm do:
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```shell
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npm install util
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```
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## Usage
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```javascript
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var util = require('util')
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var EventEmitter = require('events')
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function MyClass() { EventEmitter.call(this) }
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util.inherits(MyClass, EventEmitter)
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```
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## Browser Support
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The `util` module uses ES5 features. If you need to support very old browsers like IE8, use a shim like [`es5-shim`](https://www.npmjs.com/package/es5-shim). You need both the shim and the sham versions of `es5-shim`.
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To use `util.promisify` and `util.callbackify`, Promises must already be available. If you need to support browsers like IE11 that do not support Promises, use a shim. [es6-promise](https://github.com/stefanpenner/es6-promise) is a popular one but there are many others available on npm.
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## API
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See the [Node.js util docs][util]. `util` currently supports the Node 8 LTS API. However, some of the methods are outdated. The `inspect` and `format` methods included in this module are a lot more simple and barebones than the ones in Node.js.
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## Contributing
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PRs are very welcome! The main way to contribute to `util` is by porting features, bugfixes and tests from Node.js. Ideally, code contributions to this module are copy-pasted from Node.js and transpiled to ES5, rather than reimplemented from scratch. Matching the Node.js code as closely as possible makes maintenance simpler when new changes land in Node.js.
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This module intends to provide exactly the same API as Node.js, so features that are not available in the core `util` module will not be accepted. Feature requests should instead be directed at [nodejs/node](https://github.com/nodejs/node) and will be added to this module once they are implemented in Node.js.
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If there is a difference in behaviour between Node.js's `util` module and this module, please open an issue!
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## License
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[MIT](./LICENSE)
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[util]: https://nodejs.org/docs/latest-v8.x/api/util.html
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