Disallow missing displayName in a React component definition (`react/display-name`)

💼 This rule is enabled in the ☑️ recommended config.

DisplayName allows you to name your component. This name is used by React in debugging messages.

Rule Details

Examples of incorrect code for this rule:

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

const Hello = React.memo(({ a }) => {
  return <>{a}</>
})

export default ({ a }) => {
  return <>{a}</>
}

Examples of correct code for this rule:

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

const Hello = React.memo(function Hello({ a }) {
  return <>{a}</>
})

Rule Options

...
"react/display-name": [<enabled>, { "ignoreTranspilerName": <boolean> }]
...

`ignoreTranspilerName` (default: `false`)

When true the rule will ignore the name set by the transpiler and require a displayName property in this case.

Examples of correct code for { ignoreTranspilerName: true } option:

var Hello = createReactClass({
  displayName: 'Hello',

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

export default class Hello extends React.Component {
  render() {
    return <div>Hello {this.props.name}</div>;
  }
}
Hello.displayName = 'Hello';

export default function Hello({ name }) {
  return <div>Hello {name}</div>;
}
Hello.displayName = 'Hello';

Examples of incorrect code for { ignoreTranspilerName: true } option:

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

export default class Hello extends React.Component {
  render() {
    return <div>Hello {this.props.name}</div>;
  }
}

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

export default class extends React.Component {
  render() {
    return <div>Hello {this.props.name}</div>;
  }
}

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

About component detection

For this rule to work we need to detect React components, this could be very hard since components could be declared in a lot of ways.

For now we should detect components created with:

createReactClass()
an ES6 class that inherit from React.Component or Component
a stateless function that return JSX or the result of a React.createElement call.

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