[New] require-default-props: add option to ignore functional components

Author: RedTn

CHANGELOG.md

@@ -11,6 +11,7 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
  * [`prop-types`][]: Support Flow Type spread ([#2446][] @moroine)
  * [`jsx-props-no-spreading`][]: add `explicitSpread` option to allow explicit spread of props ([#2449][] @pawelnvk)
  * [`jsx-no-target-blank`][]: warn on `target={'_blank'}` expressions ([#2451][] @timkraut)
+ * [`require-default-props`]: add option to ignore functional components ([#2532][] @RedTn)
 
 ### Fixed
  * [`sort-prop-types`][], [`jsx-sort-default-props`][]: disable broken autofix ([#2505][] @webOS101)
@@ -34,6 +35,7 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
  * [Docs] [`no-unused-prop-types`][]: clean up prose ([#2273][] @coryhouse)
  * [Docs] [`jsx-no-bind`][]: add section about React Hooks ([#2443][] @kdex)
 
+[#2532]: https://github.com/yannickcr/eslint-plugin-react/pull/2532
 [#2505]: https://github.com/yannickcr/eslint-plugin-react/pull/2505
 [#2504]: https://github.com/yannickcr/eslint-plugin-react/pull/2504
 [#2500]: https://github.com/yannickcr/eslint-plugin-react/pull/2500

docs/rules/require-default-props.md

@@ -188,12 +188,13 @@ NotAComponent.propTypes = {
 
 ```js
 ...
-"react/require-default-props": [<enabled>, { forbidDefaultForRequired: <boolean> }]
+"react/require-default-props": [<enabled>, { forbidDefaultForRequired: <boolean>, ignoreFunctionalComponents: <boolean> }]
 ...
 ```
 
 * `enabled`: for enabling the rule. 0=off, 1=warn, 2=error. Defaults to 0.
 * `forbidDefaultForRequired`: optional boolean to forbid prop default for a required prop. Defaults to false.
+* `ignoreFunctionalComponents`: optional boolean to ignore this rule for functional components. Defaults to false.
 
 ### `forbidDefaultForRequired`
 
@@ -269,6 +270,67 @@ MyStatelessComponent.propTypes = {
 };
 ```
 
+### `ignoreFunctionalComponents`
+
+When set to `true`, ignores this rule for all functional components.
+
+The following patterns are warnings:
+
+```jsx
+class Greeting extends React.Component {
+  render() {
+    return (
+      <h1>Hello, {this.props.foo} {this.props.bar}</h1>
+    );
+  }
+
+  static propTypes = {
+    foo: PropTypes.string,
+    bar: PropTypes.string.isRequired
+  };
+
+  static defaultProps = {
+    foo: "foo",
+    bar: "bar"
+  };
+}
+```
+
+The following patterns are **not** warnings:
+
+```jsx
+function MyStatelessComponent({ foo, bar }) {
+  return <div>{foo}{bar}</div>;
+}
+
+MyStatelessComponent.propTypes = {
+  foo: PropTypes.string,
+  bar: PropTypes.string
+};
+```
+
+```jsx
+const MyStatelessComponent = ({ foo, bar }) => {
+  return <div>{foo}{bar}</div>;
+}
+
+MyStatelessComponent.propTypes = {
+  foo: PropTypes.string,
+  bar: PropTypes.string
+};
+```
+
+```jsx
+const MyStatelessComponent = function({ foo, bar }) {
+  return <div>{foo}{bar}</div>;
+}
+
+MyStatelessComponent.propTypes = {
+  foo: PropTypes.string,
+  bar: PropTypes.string
+};
+```
+
 ## When Not To Use It
 
 If you don't care about using `defaultsProps` for your component's props that are not required, you can disable this rule.

lib/rules/require-default-props.js

@@ -7,7 +7,7 @@
 
 const Components = require('../util/Components');
 const docsUrl = require('../util/docsUrl');
-
+const astUtil = require('../util/ast');
 
 // ------------------------------------------------------------------------------
 // Rule Definition
@@ -26,6 +26,9 @@ module.exports = {
       properties: {
         forbidDefaultForRequired: {
           type: 'boolean'
+        },
+        ignoreFunctionalComponents: {
+          type: 'boolean'
         }
       },
       additionalProperties: false
@@ -35,7 +38,7 @@ module.exports = {
   create: Components.detect((context, components) => {
     const configuration = context.options[0] || {};
     const forbidDefaultForRequired = configuration.forbidDefaultForRequired || false;
-
+    const ignoreFunctionalComponents = configuration.ignoreFunctionalComponents || false;
 
     /**
      * Reports all propTypes passed in that don't have a defaultProps counterpart.
@@ -83,7 +86,13 @@ module.exports = {
       'Program:exit'() {
         const list = components.list();
 
-        Object.keys(list).filter(component => list[component].declaredPropTypes).forEach((component) => {
+        Object.keys(list).filter((component) => {
+          if (ignoreFunctionalComponents &&
+            (astUtil.isFunction(list[component].node) || astUtil.isFunctionLikeExpression(list[component].node))) {
+            return false;
+          }
+          return list[component].declaredPropTypes;
+        }).forEach((component) => {
           reportPropTypesWithoutDefault(
             list[component].declaredPropTypes,
             list[component].defaultProps || {}