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Enforce best practices for JavaScript promises.
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.
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"]
}
| 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 |
||
prefer-await-to-callbacks |
Prefer async/await to the callback pattern |
Key
| icon | description |
|---|---|
| Reports as error in recommended configuration | |
| Reports as warning in recommended configuration | |
| ES2017 Async Await rules | |
Rule is fixable with eslint --fix |
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