ESLint-plugin-React

React specific linting rules for ESLint

Installation

Install ESLint either locally or globally. (Note that locally, per project, is strongly preferred)

$ npm install eslint --save-dev

If you installed ESLint globally, you have to install React plugin globally too. Otherwise, install it locally.

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

Configuration

Use our preset to get reasonable defaults:

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

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": "React.Fragment",  // Fragment to use, default to "React.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.
                           // default to latest and warns if missing
                           // It will default 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"}
    ],
    "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",
  }

List of supported rules

• react/boolean-prop-naming: Enforces consistent naming for boolean props
• react/button-has-type: Forbid "button" element without an explicit "type" attribute
• react/default-props-match-prop-types: Enforce all defaultProps are defined and not "required" in propTypes.
• react/destructuring-assignment: Enforce consistent usage of destructuring assignment of props, state, and context
• react/display-name: Prevent missing displayName in a React component definition
• react/forbid-component-props: Forbid certain props on components
• react/forbid-dom-props: Forbid certain props on DOM Nodes
• react/forbid-elements: Forbid certain elements
• react/forbid-foreign-prop-types: Forbid using another component's propTypes
• react/forbid-prop-types: Forbid certain propTypes
• react/function-component-definition: Standardize the way function component get defined (fixable)
• react/no-access-state-in-setstate: Reports when this.state is accessed within setState
• react/no-adjacent-inline-elements: Prevent adjacent inline elements not separated by whitespace.
• react/no-array-index-key: Prevent usage of Array index in keys
• react/no-children-prop: Prevent passing of children as props.
• react/no-danger: Prevent usage of dangerous JSX props
• react/no-danger-with-children: Report when a DOM element is using both children and dangerouslySetInnerHTML
• react/no-deprecated: Prevent usage of deprecated methods
• react/no-did-mount-set-state: Prevent usage of setState in componentDidMount
• react/no-did-update-set-state: Prevent usage of setState in componentDidUpdate
• react/no-direct-mutation-state: Prevent direct mutation of this.state
• react/no-find-dom-node: Prevent usage of findDOMNode
• react/no-is-mounted: Prevent usage of isMounted
• react/no-multi-comp: Prevent multiple component definition per file
• react/no-redundant-should-component-update: Flag shouldComponentUpdate when extending PureComponent
• react/no-render-return-value: Prevent usage of the return value of React.render
• react/no-set-state: Prevent usage of setState
• react/no-string-refs: Prevent string definitions for references and prevent referencing this.refs
• react/no-this-in-sfc: Report "this" being used in stateless components
• react/no-typos: Prevent common typos
• react/no-unescaped-entities: Detect unescaped HTML entities, which might represent malformed tags
• react/no-unknown-property: Prevent usage of unknown DOM property (fixable)
• react/no-unsafe: Prevent usage of unsafe lifecycle methods
• react/no-unused-prop-types: Prevent definitions of unused prop types
• react/no-unused-state: Prevent definition of unused state fields
• react/no-will-update-set-state: Prevent usage of setState in componentWillUpdate
• react/prefer-es6-class: Enforce ES5 or ES6 class for React Components
• react/prefer-read-only-props: Require read-only props. (fixable)
• react/prefer-stateless-function: Enforce stateless components to be written as a pure function
• react/prop-types: Prevent missing props validation in a React component definition
• react/react-in-jsx-scope: Prevent missing React when using JSX
• react/require-default-props: Enforce a defaultProps definition for every prop that is not a required prop.
• react/require-optimization: Enforce React components to have a shouldComponentUpdate method
• react/require-render-return: Enforce ES5 or ES6 class for returning value in render function
• react/self-closing-comp: Prevent extra closing tags for components without children (fixable)
• react/sort-comp: Enforce component methods order
• react/sort-prop-types: Enforce propTypes declarations alphabetical sorting
• react/state-in-constructor: State initialization in an ES6 class component should be in a constructor
• react/static-property-placement: Defines where React component static properties should be positioned.
• react/style-prop-object: Enforce style prop value is an object
• react/void-dom-elements-no-children: Prevent passing of children to void DOM elements (e.g. <br />).

JSX-specific rules

• react/jsx-boolean-value: Enforce boolean attributes notation in JSX (fixable)
• react/jsx-child-element-spacing: Ensures inline tags are not rendered without spaces between them
• react/jsx-closing-bracket-location: Validate closing bracket location in JSX (fixable)
• react/jsx-closing-tag-location: Validate closing tag location for multiline JSX (fixable)
• react/jsx-curly-brace-presence: Disallow unnecessary JSX expressions when literals alone are sufficient or enfore JSX expressions on literals in JSX children or attributes (fixable)
• react/jsx-curly-newline: Enforce consistent line breaks inside jsx curly (fixable)
• react/jsx-curly-spacing: Enforce or disallow spaces inside of curly braces in JSX attributes (fixable)
• react/jsx-equals-spacing: Disallow or enforce spaces around equal signs in JSX attributes (fixable)
• react/jsx-filename-extension: Restrict file extensions that may contain JSX
• react/jsx-first-prop-new-line: Ensure proper position of the first property in JSX (fixable)
• react/jsx-fragments: Enforce shorthand or standard form for React fragments (fixable)
• react/jsx-handler-names: Enforce event handler naming conventions in JSX
• react/jsx-indent: Validate JSX indentation (fixable)
• react/jsx-indent-props: Validate props indentation in JSX (fixable)
• react/jsx-key: Report missing key props in iterators/collection literals
• react/jsx-max-depth: Validate JSX maximum depth
• react/jsx-max-props-per-line: Limit maximum of props on a single line in JSX (fixable)
• react/jsx-no-bind: Prevents usage of Function.prototype.bind and arrow functions in React component props
• react/jsx-no-comment-textnodes: Comments inside children section of tag should be placed inside braces
• react/jsx-no-duplicate-props: Enforce no duplicate props
• react/jsx-no-literals: Prevent using string literals in React component definition
• react/jsx-no-script-url: Forbid javascript: URLs
• react/jsx-no-target-blank: Forbid target="_blank" attribute without rel="noreferrer"
• react/jsx-no-undef: Disallow undeclared variables in JSX
• react/jsx-no-useless-fragment: Disallow unnecessary fragments (fixable)
• react/jsx-one-expression-per-line: Limit to one expression per line in JSX (fixable)
• react/jsx-pascal-case: Enforce PascalCase for user-defined JSX components
• react/jsx-props-no-multi-spaces: Disallow multiple spaces between inline JSX props (fixable)
• react/jsx-props-no-spreading: Prevent JSX prop spreading
• react/jsx-sort-default-props: Enforce default props alphabetical sorting
• react/jsx-sort-props: Enforce props alphabetical sorting (fixable)
• react/jsx-space-before-closing: Validate spacing before closing bracket in JSX (fixable)
• react/jsx-tag-spacing: Validate whitespace in and around the JSX opening and closing brackets (fixable)
• react/jsx-uses-react: Prevent React to be marked as unused
• react/jsx-uses-vars: Prevent variables used in JSX to be marked as unused
• react/jsx-wrap-multilines: Prevent missing parentheses around multilines JSX (fixable)

Other useful plugins

• Rules of Hooks: eslint-plugin-react-hooks
• JSX accessibility: eslint-plugin-jsx-a11y
• React Native: eslint-plugin-react-native

Shareable configurations

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.

The rules enabled in this configuration are:

• react/display-name
• react/jsx-key
• react/jsx-no-comment-textnodes
• react/jsx-no-duplicate-props
• react/jsx-no-target-blank
• react/jsx-no-undef
• react/jsx-uses-react
• react/jsx-uses-vars
• react/no-children-prop
• react/no-danger-with-children
• react/no-deprecated
• react/no-direct-mutation-state
• react/no-find-dom-node
• react/no-is-mounted
• react/no-render-return-value
• react/no-string-refs
• react/no-unescaped-entities
• react/no-unknown-property
• react/prop-types
• react/react-in-jsx-scope
• react/require-render-return

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.

License

ESLint-plugin-React is licensed under the MIT License.