[Fix] jsx-no-bind: handle local function declarations

Fixes #3047

Author: p7g

CHANGELOG.md

@@ -20,6 +20,7 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 * [`no-typos`]: prevent crash on styled components and forwardRefs ([#3036][] @ljharb)
 * [`destructuring-assignment`], component detection: handle default exports edge case ([#3038][] @vedadeepta)
 * [`no-typos`]: fix crash on private methods ([#3043][] @ljharb)
+* [`jsx-no-bind`]: handle local function declarations ([#3048][] @p7g)
 
 ### Changed
 * [Docs] [`jsx-no-bind`]: updates discussion of refs ([#2998][] @dimitropoulos)
@@ -28,6 +29,7 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 * [Docs] [`require-default-props`]: fix small typo ([#2994][] @evsasse)
 * [Tests] add weekly scheduled smoke tests ([#2963][] @AriPerkkio)
 
+[#3048]: https://github.com/yannickcr/eslint-plugin-react/pull/3048
 [#3043]: https://github.com/yannickcr/eslint-plugin-react/issues/3043
 [#3039]: https://github.com/yannickcr/eslint-plugin-react/pull/3039
 [#3038]: https://github.com/yannickcr/eslint-plugin-react/pull/3038

docs/rules/jsx-no-bind.md

@@ -14,6 +14,10 @@ Examples of **incorrect** code for this rule:
 ```jsx
 <Foo onClick={() => console.log('Hello!')}></Foo>
 ```
+```jsx
+function onClick() { console.log('Hello!'); }
+<Foo onClick={onClick} />
+```
 
 Examples of **correct** code for this rule:
 ```jsx
@@ -76,6 +80,11 @@ Examples of **correct** code for this rule, when `allowFunctions` is `true`:
 <Foo onClick={function () { alert("1337") }} />
 ```
 
+```jsx
+function onClick() { alert("1337"); }
+<Foo onClick={onClick} />
+```
+
 ### `allowBind`
 
 Examples of **correct** code for this rule, when `allowBind` is `true`:

lib/rules/jsx-no-bind.js

@@ -96,7 +96,10 @@ module.exports = {
       if (!configuration.allowArrowFunctions && nodeType === 'ArrowFunctionExpression') {
         return 'arrowFunc';
       }
-      if (!configuration.allowFunctions && nodeType === 'FunctionExpression') {
+      if (
+        !configuration.allowFunctions
+        && (nodeType === 'FunctionExpression' || nodeType === 'FunctionDeclaration')
+      ) {
         return 'func';
       }
       if (!configuration.allowBind && nodeType === 'BindExpression') {
@@ -144,6 +147,15 @@ module.exports = {
         setBlockVariableNameSet(node.range[0]);
       },
 
+      FunctionDeclaration(node) {
+        const blockAncestors = getBlockStatementAncestors(node);
+        const variableViolationType = getNodeViolationType(node);
+
+        if (blockAncestors.length > 0 && variableViolationType) {
+          addVariableNameToSet(variableViolationType, node.id.name, blockAncestors[0].range[0]);
+        }
+      },
+
       VariableDeclarator(node) {
         if (!node.init) {
           return;

tests/lib/rules/jsx-no-bind.js

@@ -301,6 +301,19 @@ ruleTester.run('jsx-no-bind', rule, {
       code: '<div foo={::this.onChange} />',
       options: [{ignoreDOMComponents: true}],
       parser: parsers.BABEL_ESLINT
+    },
+
+    // Local function declaration
+    {
+      code: [
+        'function click() { return true; }',
+        'class Hello23 extends React.Component {',
+        '  renderDiv() {',
+        '    return <div onClick={click}>Hello</div>;',
+        '  }',
+        '};'
+      ].join('\n'),
+      errors: []
     }
   ],
 
@@ -806,6 +819,21 @@ ruleTester.run('jsx-no-bind', rule, {
       parser: parsers.BABEL_ESLINT
     },
 
+    // Local function declaration
+    {
+      code: [
+        'class Hello23 extends React.Component {',
+        '  renderDiv() {',
+        '    function click() { return true; }',
+        '    return <div onClick={click}>Hello</div>;',
+        '  }',
+        '};'
+      ].join('\n'),
+      errors: [
+        {messageId: 'func'}
+      ]
+    },
+
     // ignore DOM components
     {
       code: '<Foo onClick={this._handleClick.bind(this)} />',