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December 16, 2014 00:44

eslint-plugin-react Version Badge

===================

github actions Maintenance Status NPM version Tidelift

React specific linting rules for eslint

Installation

npm install eslint eslint-plugin-react --save-dev

It is also possible to install ESLint globally rather than locally (using npm install -g eslint). However, this is not recommended, and any plugins or shareable configs that you use must be installed locally in either case.

Configuration (legacy: .eslintrc*)

Use our preset to get reasonable defaults:

  "extends": [
    "eslint:recommended",
    "plugin:react/recommended"
  ]

If you are using the new JSX transform from React 17, extend react/jsx-runtime in your eslint config (add "plugin:react/jsx-runtime" to "extends") to disable the relevant rules.

You should also specify settings that will be shared across all the plugin rules. (More about eslint shared settings)

{
  "settings": {
    "react": {
      "createClass": "createReactClass", // Regex for Component Factory to use,
                                         // default to "createReactClass"
      "pragma": "React",  // Pragma to use, default to "React"
      "fragment": "Fragment",  // Fragment to use (may be a property of <pragma>), default to "Fragment"
      "version": "detect", // React version. "detect" automatically picks the version you have installed.
                           // You can also use `16.0`, `16.3`, etc, if you want to override the detected value.
                           // It will default to "latest" and warn if missing, and to "detect" in the future
      "flowVersion": "0.53" // Flow version
    },
    "propWrapperFunctions": [
        // The names of any function used to wrap propTypes, e.g. `forbidExtraProps`. If this isn't set, any propTypes wrapped in a function will be skipped.
        "forbidExtraProps",
        {"property": "freeze", "object": "Object"},
        {"property": "myFavoriteWrapper"},
        // for rules that check exact prop wrappers
        {"property": "forbidExtraProps", "exact": true}
    ],
    "componentWrapperFunctions": [
        // The name of any function used to wrap components, e.g. Mobx `observer` function. If this isn't set, components wrapped by these functions will be skipped.
        "observer", // `property`
        {"property": "styled"}, // `object` is optional
        {"property": "observer", "object": "Mobx"},
        {"property": "observer", "object": "<pragma>"} // sets `object` to whatever value `settings.react.pragma` is set to
    ],
    "formComponents": [
      // Components used as alternatives to <form> for forms, eg. <Form endpoint={ url } />
      "CustomForm",
      {"name": "Form", "formAttribute": "endpoint"}
    ],
    "linkComponents": [
      // Components used as alternatives to <a> for linking, eg. <Link to={ url } />
      "Hyperlink",
      {"name": "Link", "linkAttribute": "to"}
    ]
  }
}

If you do not use a preset you will need to specify individual rules and add extra configuration.

Add "react" to the plugins section.

{
  "plugins": [
    "react"
  ]
}

Enable JSX support.

With eslint 2+

{
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    }
  }
}

Enable the rules that you would like to use.

  "rules": {
    "react/jsx-uses-react": "error",
    "react/jsx-uses-vars": "error",
  }

Shareable configs

Recommended

This plugin exports a recommended configuration that enforces React good practices.

To enable this configuration use the extends property in your .eslintrc config file:

{
  "extends": ["eslint:recommended", "plugin:react/recommended"]
}

See eslint documentation for more information about extending configuration files.

All

This plugin also exports an all configuration that includes every available rule. This pairs well with the eslint:all rule.

{
  "plugins": [
    "react"
  ],
  "extends": ["eslint:all", "plugin:react/all"]
}

Note: These configurations will import eslint-plugin-react and enable JSX in parser options.

Configuration (new: eslint.config.js)

From v8.21.0, eslint announced a new config system. In the new system, .eslintrc* is no longer used. eslint.config.js would be the default config file name. In eslint v8, the legacy system (.eslintrc*) would still be supported, while in eslint v9, only the new system would be supported.

And from v8.23.0, eslint CLI starts to look up eslint.config.js. So, if your eslint is >=8.23.0, you're 100% ready to use the new config system.

You might want to check out the official blog posts,

and the official docs.

Plugin

The default export of eslint-plugin-react is a plugin object.

const react = require('eslint-plugin-react');
const globals = require('globals');

module.exports = [
  
  {
    files: ['**/*.{js,jsx,mjs,cjs,ts,tsx}'],
    plugins: {
      react,
    },
    languageOptions: {
      parserOptions: {
        ecmaFeatures: {
          jsx: true,
        },
      },
      globals: {
        ...globals.browser,
      },
    },
    rules: {
      // ... any rules you want
      'react/jsx-uses-react': 'error',
      'react/jsx-uses-vars': 'error',
     },
    // ... others are omitted for brevity
  },
  
];

Configuring shared settings

Refer to the official docs.

The schema of the settings.react object would be identical to that of what's already described above in the legacy config section.

Shareable configs

There're also 3 shareable configs.

  • eslint-plugin-react/configs/all
  • eslint-plugin-react/configs/recommended
  • eslint-plugin-react/configs/jsx-runtime

If your eslint.config.js is ESM, include the .js extension (e.g. eslint-plugin-react/recommended.js). Note that the next semver-major will require omitting the extension for these imports.

Note: These configurations will import eslint-plugin-react and enable JSX in languageOptions.parserOptions.

In the new config system, plugin: protocol(e.g. plugin:react/recommended) is no longer valid. As eslint does not automatically import the preset config (shareable config), you explicitly do it by yourself.

const reactRecommended = require('eslint-plugin-react/configs/recommended');

module.exports = [
  
  reactRecommended, // This is not a plugin object, but a shareable config object
  
];

You can of course add/override some properties.

Note: Our shareable configs does not preconfigure files or languageOptions.globals. For most of the cases, you probably want to configure some properties by yourself.

const reactRecommended = require('eslint-plugin-react/configs/recommended');
const globals = require('globals');

module.exports = [
  
  {
    files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
    ...reactRecommended,
    languageOptions: {
      ...reactRecommended.languageOptions,
      globals: {
        ...globals.serviceworker,
        ...globals.browser;
      },
    },
  },
  
];

The above example is same as the example below, as the new config system is based on chaining.

const reactRecommended = require('eslint-plugin-react/configs/recommended');
const globals = require('globals');

module.exports = [
  
  {
    files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
    ...reactRecommended,
  },
  {
    files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
    languageOptions: {
      globals: {
        ...globals.serviceworker,
        ...globals.browser,
      },
    },
  },
  
];

List of supported rules

💼 Configurations enabled in.
🚫 Configurations disabled in.
🏃 Set in the jsx-runtime configuration.
☑️ Set in the recommended configuration.
🔧 Automatically fixable by the --fix CLI option.
💡 Manually fixable by editor suggestions.
Deprecated.

Name                                 Description 💼 🚫 🔧 💡
boolean-prop-naming Enforces consistent naming for boolean props
button-has-type Disallow usage of button elements without an explicit type attribute
default-props-match-prop-types Enforce all defaultProps have a corresponding non-required PropType
destructuring-assignment Enforce consistent usage of destructuring assignment of props, state, and context 🔧
display-name Disallow missing displayName in a React component definition ☑️
forbid-component-props Disallow certain props on components
forbid-dom-props Disallow certain props on DOM Nodes
forbid-elements Disallow certain elements
forbid-foreign-prop-types Disallow using another component's propTypes
forbid-prop-types Disallow certain propTypes
function-component-definition Enforce a specific function type for function components 🔧
hook-use-state Ensure destructuring and symmetric naming of useState hook value and setter variables 💡
iframe-missing-sandbox Enforce sandbox attribute on iframe elements
jsx-boolean-value Enforce boolean attributes notation in JSX 🔧
jsx-child-element-spacing Enforce or disallow spaces inside of curly braces in JSX attributes and expressions
jsx-closing-bracket-location Enforce closing bracket location in JSX 🔧
jsx-closing-tag-location Enforce closing tag location for multiline JSX 🔧
jsx-curly-brace-presence Disallow unnecessary JSX expressions when literals alone are sufficient or enforce JSX expressions on literals in JSX children or attributes 🔧
jsx-curly-newline Enforce consistent linebreaks in curly braces in JSX attributes and expressions 🔧
jsx-curly-spacing Enforce or disallow spaces inside of curly braces in JSX attributes and expressions 🔧
jsx-equals-spacing Enforce or disallow spaces around equal signs in JSX attributes 🔧
jsx-filename-extension Disallow file extensions that may contain JSX
jsx-first-prop-new-line Enforce proper position of the first property in JSX 🔧
jsx-fragments Enforce shorthand or standard form for React fragments 🔧
jsx-handler-names Enforce event handler naming conventions in JSX
jsx-indent Enforce JSX indentation 🔧
jsx-indent-props Enforce props indentation in JSX 🔧
jsx-key Disallow missing key props in iterators/collection literals ☑️
jsx-max-depth Enforce JSX maximum depth
jsx-max-props-per-line Enforce maximum of props on a single line in JSX 🔧
jsx-newline Require or prevent a new line after jsx elements and expressions. 🔧
jsx-no-bind Disallow .bind() or arrow functions in JSX props
jsx-no-comment-textnodes Disallow comments from being inserted as text nodes ☑️
jsx-no-constructed-context-values Disallows JSX context provider values from taking values that will cause needless rerenders
jsx-no-duplicate-props Disallow duplicate properties in JSX ☑️
jsx-no-leaked-render Disallow problematic leaked values from being rendered 🔧
jsx-no-literals Disallow usage of string literals in JSX
jsx-no-script-url Disallow usage of javascript: URLs
jsx-no-target-blank Disallow target="_blank" attribute without rel="noreferrer" ☑️ 🔧
jsx-no-undef Disallow undeclared variables in JSX ☑️
jsx-no-useless-fragment Disallow unnecessary fragments 🔧
jsx-one-expression-per-line Require one JSX element per line 🔧
jsx-pascal-case Enforce PascalCase for user-defined JSX components
jsx-props-no-multi-spaces Disallow multiple spaces between inline JSX props 🔧
jsx-props-no-spreading Disallow JSX prop spreading
jsx-sort-default-props Enforce defaultProps declarations alphabetical sorting
jsx-sort-props Enforce props alphabetical sorting 🔧
jsx-space-before-closing Enforce spacing before closing bracket in JSX 🔧
jsx-tag-spacing Enforce whitespace in and around the JSX opening and closing brackets 🔧
jsx-uses-react Disallow React to be incorrectly marked as unused ☑️ 🏃
jsx-uses-vars Disallow variables used in JSX to be incorrectly marked as unused ☑️
jsx-wrap-multilines Disallow missing parentheses around multiline JSX 🔧
no-access-state-in-setstate Disallow when this.state is accessed within setState
no-adjacent-inline-elements Disallow adjacent inline elements not separated by whitespace.
no-array-index-key Disallow usage of Array index in keys
no-arrow-function-lifecycle Lifecycle methods should be methods on the prototype, not class fields 🔧
no-children-prop Disallow passing of children as props ☑️
no-danger Disallow usage of dangerous JSX properties
no-danger-with-children Disallow when a DOM element is using both children and dangerouslySetInnerHTML ☑️
no-deprecated Disallow usage of deprecated methods ☑️
no-did-mount-set-state Disallow usage of setState in componentDidMount
no-did-update-set-state Disallow usage of setState in componentDidUpdate
no-direct-mutation-state Disallow direct mutation of this.state ☑️
no-find-dom-node Disallow usage of findDOMNode ☑️
no-invalid-html-attribute Disallow usage of invalid attributes 💡
no-is-mounted Disallow usage of isMounted ☑️
no-multi-comp Disallow multiple component definition per file
no-namespace Enforce that namespaces are not used in React elements
no-object-type-as-default-prop Disallow usage of referential-type variables as default param in functional component
no-redundant-should-component-update Disallow usage of shouldComponentUpdate when extending React.PureComponent
no-render-return-value Disallow usage of the return value of ReactDOM.render ☑️
no-set-state Disallow usage of setState
no-string-refs Disallow using string references ☑️
no-this-in-sfc Disallow this from being used in stateless functional components
no-typos Disallow common typos
no-unescaped-entities Disallow unescaped HTML entities from appearing in markup ☑️
no-unknown-property Disallow usage of unknown DOM property ☑️ 🔧
no-unsafe Disallow usage of unsafe lifecycle methods ☑️
no-unstable-nested-components Disallow creating unstable components inside components
no-unused-class-component-methods Disallow declaring unused methods of component class
no-unused-prop-types Disallow definitions of unused propTypes
no-unused-state Disallow definitions of unused state
no-will-update-set-state Disallow usage of setState in componentWillUpdate
prefer-es6-class Enforce ES5 or ES6 class for React Components
prefer-exact-props Prefer exact proptype definitions
prefer-read-only-props Enforce that props are read-only 🔧
prefer-stateless-function Enforce stateless components to be written as a pure function
prop-types Disallow missing props validation in a React component definition ☑️
react-in-jsx-scope Disallow missing React when using JSX ☑️ 🏃
require-default-props Enforce a defaultProps definition for every prop that is not a required prop
require-optimization Enforce React components to have a shouldComponentUpdate method
require-render-return Enforce ES5 or ES6 class for returning value in render function ☑️
self-closing-comp Disallow extra closing tags for components without children 🔧
sort-comp Enforce component methods order
sort-default-props Enforce defaultProps declarations alphabetical sorting
sort-prop-types Enforce propTypes declarations alphabetical sorting 🔧
state-in-constructor Enforce class component state initialization style
static-property-placement Enforces where React component static properties should be positioned.
style-prop-object Enforce style prop value is an object
void-dom-elements-no-children Disallow void DOM elements (e.g. <img />, <br />) from receiving children

Other useful plugins

License

eslint-plugin-react is licensed under the MIT License.