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eslint-plugin-promise

Enforce best practices for JavaScript promises.

Installation
Usage
Rules
Maintainers
License

Installation

You'll first need to install ESLint:

$ npm install eslint --save-dev

Next, install eslint-plugin-promise:

$ npm install eslint-plugin-promise --save-dev

Note: If you installed ESLint globally (using the -g flag) then you must also install eslint-plugin-promise globally.

Usage

Add promise to the plugins section of your .eslintrc.json configuration file. You can omit the eslint-plugin- prefix:

{
  "plugins": ["promise"]
}

Then configure the rules you want to use under the rules section.

{
  "rules": {
    "promise/always-return": "error",
    "promise/no-return-wrap": "error",
    "promise/param-names": "error",
    "promise/catch-or-return": "error",
    "promise/no-native": "off",
    "promise/no-nesting": "warn",
    "promise/no-promise-in-callback": "warn",
    "promise/no-callback-in-promise": "warn",
    "promise/avoid-new": "warn",
    "promise/no-new-statics": "error",
    "promise/no-return-in-finally": "warn",
    "promise/valid-params": "warn"
  }
}

or start with the recommended rule set:

{
  "extends": ["plugin:promise/recommended"]
}

Rules

rule	description	recommended	fixable
`catch-or-return`	Enforces the use of `catch()` on un-returned promises.	‼️
`no-return-wrap`	Avoid wrapping values in `Promise.resolve` or `Promise.reject` when not needed.	‼️
`param-names`	Enforce consistent param names and ordering when creating new promises.	‼️
`always-return`	Return inside each `then()` to create readable and reusable Promise chains.	‼️
`no-native`	In an ES5 environment, make sure to create a `Promise` constructor before using.
`no-nesting`	Avoid nested `then()` or `catch()` statements	⚠️
`no-promise-in-callback`	Avoid using promises inside of callbacks	⚠️
`no-callback-in-promise`	Avoid calling `cb()` inside of a `then()` (use nodeify instead)	⚠️
`avoid-new`	Avoid creating `new` promises outside of utility libs (use pify instead)
`no-new-statics`	Avoid calling `new` on a Promise static method	‼️	🔧
`no-return-in-finally`	Disallow return statements in `finally()`	⚠️
`valid-params`	Ensures the proper number of arguments are passed to Promise functions	⚠️
`prefer-await-to-then`	Prefer `await` to `then()` for reading Promise values	7️⃣
`prefer-await-to-callbacks`	Prefer async/await to the callback pattern	7️⃣

Key

icon	description
‼️	Reports as error in recommended configuration
⚠️	Reports as warning in recommended configuration
7️⃣	ES2017 Async Await rules
🔧	Rule is fixable with `eslint --fix`

Maintainers

Jamund Ferguson - @xjamundx
Macklin Underdown - @macklinu

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