sort-comp.md

Enforce component methods order (react/sort-comp)

When creating React components it is more convenient to always follow the same organisation for method order to help you easily find lifecycle methods, event handlers, etc.

Fixable: This rule is automatically fixable using the sort-comp transform in react-codemod.

Rule Details

The default configuration ensures that the following order must be followed:

1. static methods and properties
2. lifecycle methods: displayName, propTypes, contextTypes, childContextTypes, mixins, statics, defaultProps, constructor, getDefaultProps, state, getInitialState, getChildContext, getDerivedStateFromProps, componentWillMount, UNSAFE_componentWillMount, componentDidMount, componentWillReceiveProps, UNSAFE_componentWillReceiveProps, shouldComponentUpdate, componentWillUpdate, UNSAFE_componentWillUpdate, getSnapshotBeforeUpdate, componentDidUpdate, componentDidCatch, componentWillUnmount (in this order).
3. custom methods
4. render method

Examples of incorrect code for this rule:

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

Examples of correct code for this rule:

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

Rule Options

This rule can take one argument to customize the components organisation.

...
"react/sort-comp": [<enabled>, { order: <order>, groups: <groups> }]
...

• enabled: for enabling the rule. 0=off, 1=warn, 2=error. Defaults to 0.
• order: optional array of methods to validate.
• groups: optional object of methods groups.

The default configuration is:

{
  order: [
    'static-methods',
    'lifecycle',
    'everything-else',
    'render'
  ],
  groups: {
    lifecycle: [
      'displayName',
      'propTypes',
      'contextTypes',
      'childContextTypes',
      'mixins',
      'statics',
      'defaultProps',
      'constructor',
      'getDefaultProps',
      'state',
      'getInitialState',
      'getChildContext',
      'getDerivedStateFromProps',
      'componentWillMount',
      'UNSAFE_componentWillMount',
      'componentDidMount',
      'componentWillReceiveProps',
      'UNSAFE_componentWillReceiveProps',
      'shouldComponentUpdate',
      'componentWillUpdate',
      'UNSAFE_componentWillUpdate',
      'getSnapshotBeforeUpdate',
      'componentDidUpdate',
      'componentDidCatch',
      'componentWillUnmount'
    ]
  }
}

• static-variables This group is not specified by default, but can be used to enforce class static variable positioning.
• static-methods is a special keyword that refers to static class methods.
• lifecycle refers to the lifecycle group defined in groups.
• everything-else is a special group that matches all of the methods that do not match any of the other groups.
• render refers to the render method.
• type-annotations. This group is not specified by default, but can be used to enforce flow annotations' positioning.
• getters This group is not specified by default, but can be used to enforce class getters' positioning.
• setters This group is not specified by default, but can be used to enforce class setters' positioning.
• instance-variables This group is not specified by default, but can be used to enforce all other instance variables' positioning.
• instance-methods This group is not specified by default, but can be used to enforce all other instance methods' positioning.

You can override this configuration to match your needs.

For example, if you want to place your event handlers (onClick, onSubmit, etc.) before render but the other methods after it:

"react/sort-comp": [1, {
  order: [
    'static-methods',
    'lifecycle',
    '/^on.+$/',
    'render',
    'everything-else'
  ]
}]

Examples of incorrect code for this rule, with the above configuration:

var Hello = createReactClass({
  render: function() {
    return <div>Hello</div>;
  },
  onClick: function() {}
});

Examples of correct code for this rule, with the above configuration:

var Hello = createReactClass({
  onClick: function() {},
  render: function() {
    return <div>Hello</div>;
  }
});

If you want to split your render method into smaller ones and keep them just before render:

"react/sort-comp": [1, {
  order: [
    'static-methods',
    'lifecycle',
    'everything-else',
    'rendering',
  ],
  groups: {
    rendering: [
      '/^render.+$/',
      'render'
    ]
  }
}]

Examples of incorrect code for this rule, with the above configuration:

var Hello = createReactClass({
  renderButton: function() {},
  onClick: function() {},
  render: function() {
    return <div>Hello</div>;
  }
});

Examples of correct code for this rule, with the above configuration:

var Hello = createReactClass({
  onClick: function() {},
  renderButton: function() {},
  render: function() {
    return <div>Hello</div>;
  }
});

If you want to flow annotations to be at the top:

"react/sort-comp": [1, {
  order: [
    'type-annotations',
    'static-methods',
    'lifecycle',
    'everything-else',
    'render',
  ],
}]

Examples of incorrect code for this rule, with the above configuration:

class Hello extends React.Component<any, Props, void> {
  onClick() { this._someElem = true; }
  props: Props;
  _someElem: bool;
  render() {
    return <div>Hello</div>;
  }
}

Examples of correct code for this rule, with the above configuration:

type Props = {};
class Hello extends React.Component<any, Props, void> {
  props: Props;
  _someElem: bool;
  onClick() { this._someElem = true; }
  render() {
    return <div>Hello</div>;
  }
}

When Not To Use It

This rule is a formatting preference and not following it won't negatively affect the quality of your code. If components organisation isn't a part of your coding standards, then you can leave this rule off.