Enforce stateless components to be written as a pure function (`react/prefer-stateless-function`)

Stateless functional components are simpler than class based components and will benefit from future React performance optimizations specific to these components.

Rule Details

This rule will check your class based React components for

methods/properties other than displayName, propTypes, contextTypes, defaultProps, render and useless constructor (same detection as eslint no-useless-constructor rule)
instance property other than this.props and this.context
extension of React.PureComponent (if the ignorePureComponents flag is true)
presence of ref attribute in JSX
the use of decorators
render method that return anything but JSX: undefined, null, etc. (only in React <15.0.0, see shared settings for React version configuration)

If none of these elements are found, the rule will warn you to write this component as a pure function.

Examples of incorrect code for this rule:

var Hello = createReactClass({
  render: function() {
    return <div>Hello {this.props.name}</div>;
  }
});

Examples of correct code for this rule:

const Foo = function(props, context) {
  const {
    location
  } = context.router;

  return <div>{props.foo}</div>;
};

Examples of correct code for this rule, in React <15.0.0:

class Foo extends React.Component {
  render() {
    if (!this.props.foo) {
      return null
    }
    return <div>{this.props.foo}</div>;
  }
}

Rule Options

...
"react/prefer-stateless-function": [<enabled>, { "ignorePureComponents": <ignorePureComponents> }]
...

enabled: for enabling the rule. 0=off, 1=warn, 2=error. Defaults to 0.
ignorePureComponents: optional boolean set to true to ignore components extending from React.PureComponent (default to false).

`ignorePureComponents`

When true the rule will ignore Components extending from React.PureComponent that use this.props or this.context.

Examples of correct code for this rule:

class Foo extends React.PureComponent {
  render() {
    return <div>{this.props.foo}</div>;
  }
}

class Bar extends React.PureComponent {
  render() {
    return <div>Baz</div>;
  }
}

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