132 lines
6 KiB
Markdown
132 lines
6 KiB
Markdown
# eslint-plugin-promise
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Enforce best practices for JavaScript promises.
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[](https://travis-ci.org/xjamundx/eslint-plugin-promise)
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[](https://www.npmjs.com/package/eslint-plugin-promise)
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[](https://github.com/prettier/prettier)
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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- [Installation](#installation)
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- [Usage](#usage)
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- [Rules](#rules)
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- [Maintainers](#maintainers)
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- [License](#license)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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## Installation
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You'll first need to install [ESLint](http://eslint.org):
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```
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$ npm install eslint --save-dev
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```
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Next, install `eslint-plugin-promise`:
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```
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$ npm install eslint-plugin-promise --save-dev
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```
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**Note:** If you installed ESLint globally (using the `-g` flag) then you must
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also install `eslint-plugin-promise` globally.
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## Usage
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Add `promise` to the plugins section of your `.eslintrc.json` configuration
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file. You can omit the `eslint-plugin-` prefix:
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```json
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{
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"plugins": ["promise"]
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}
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```
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Then configure the rules you want to use under the rules section.
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```json
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{
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"rules": {
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"promise/always-return": "error",
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"promise/no-return-wrap": "error",
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"promise/param-names": "error",
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"promise/catch-or-return": "error",
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"promise/no-native": "off",
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"promise/no-nesting": "warn",
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"promise/no-promise-in-callback": "warn",
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"promise/no-callback-in-promise": "warn",
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"promise/avoid-new": "warn",
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"promise/no-new-statics": "error",
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"promise/no-return-in-finally": "warn",
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"promise/valid-params": "warn"
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}
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}
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```
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or start with the recommended rule set:
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```json
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{
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"extends": ["plugin:promise/recommended"]
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}
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```
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## Rules
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| rule | description | recommended | fixable |
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| -------------------------------------------------------- | -------------------------------------------------------------------------------- | ----------- | -------- |
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| [`catch-or-return`][catch-or-return] | Enforces the use of `catch()` on un-returned promises. | :bangbang: | |
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| [`no-return-wrap`][no-return-wrap] | Avoid wrapping values in `Promise.resolve` or `Promise.reject` when not needed. | :bangbang: | |
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| [`param-names`][param-names] | Enforce consistent param names and ordering when creating new promises. | :bangbang: | |
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| [`always-return`][always-return] | Return inside each `then()` to create readable and reusable Promise chains. | :bangbang: | |
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| [`no-native`][no-native] | In an ES5 environment, make sure to create a `Promise` constructor before using. | | |
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| [`no-nesting`][no-nesting] | Avoid nested `then()` or `catch()` statements | :warning: | |
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| [`no-promise-in-callback`][no-promise-in-callback] | Avoid using promises inside of callbacks | :warning: | |
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| [`no-callback-in-promise`][no-callback-in-promise] | Avoid calling `cb()` inside of a `then()` (use [nodeify][] instead) | :warning: | |
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| [`avoid-new`][avoid-new] | Avoid creating `new` promises outside of utility libs (use [pify][] instead) | | |
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| [`no-new-statics`][no-new-statics] | Avoid calling `new` on a Promise static method | :bangbang: | :wrench: |
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| [`no-return-in-finally`][no-return-in-finally] | Disallow return statements in `finally()` | :warning: | |
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| [`valid-params`][valid-params] | Ensures the proper number of arguments are passed to Promise functions | :warning: | |
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| [`prefer-await-to-then`][prefer-await-to-then] | Prefer `await` to `then()`/`catch()`/`finally()` for reading Promise values | :seven: | |
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| [`prefer-await-to-callbacks`][prefer-await-to-callbacks] | Prefer async/await to the callback pattern | :seven: | |
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**Key**
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| icon | description |
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| ---------- | ----------------------------------------------- |
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| :bangbang: | Reports as error in recommended configuration |
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| :warning: | Reports as warning in recommended configuration |
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| :seven: | ES2017 Async Await rules |
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| :wrench: | Rule is fixable with `eslint --fix` |
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## Maintainers
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- Jamund Ferguson - [@xjamundx][]
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- Macklin Underdown - [@macklinu][]
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## License
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- (c) MMXV jden <mailto:jason@denizac.org> - ISC license.
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- (c) 2016 Jamund Ferguson <mailto:jamund@gmail.com> - ISC license.
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[catch-or-return]: docs/rules/catch-or-return.md
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[no-return-wrap]: docs/rules/no-return-wrap.md
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[param-names]: docs/rules/param-names.md
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[always-return]: docs/rules/always-return.md
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[no-native]: docs/rules/no-native.md
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[no-nesting]: docs/rules/no-nesting.md
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[no-promise-in-callback]: docs/rules/no-promise-in-callback.md
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[no-callback-in-promise]: docs/rules/no-callback-in-promise.md
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[avoid-new]: docs/rules/avoid-new.md
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[no-new-statics]: docs/rules/no-new-statics.md
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[no-return-in-finally]: docs/rules/no-return-in-finally.md
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[valid-params]: docs/rules/valid-params.md
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[prefer-await-to-then]: docs/rules/prefer-await-to-then.md
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[prefer-await-to-callbacks]: docs/rules/prefer-await-to-callbacks.md
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[nodeify]: https://www.npmjs.com/package/nodeify
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[pify]: https://www.npmjs.com/package/pify
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[@macklinu]: https://github.com/macklinu
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[@xjamundx]: https://github.com/xjamundx
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