Add checkFragmentShorthand option

Author: kaykayehnn

lib/rules/jsx-key.js

@@ -13,6 +13,10 @@ const docsUrl = require('../util/docsUrl');
 // Rule Definition
 // ------------------------------------------------------------------------------
 
+const defaultOptions = {
+  checkFragmentShorthand: false
+}
+
 module.exports = {
   meta: {
     docs: {
@@ -21,17 +25,29 @@ module.exports = {
       recommended: true,
       url: docsUrl('jsx-key')
     },
-    schema: []
+    schema: [{
+      type: 'object',
+      properties: {
+        checkFragmentShorthand: {
+          type: 'boolean',
+          default: defaultOptions.checkFragmentShorthand
+        }
+      },
+      additionalProperties: false
+    }]
   },
 
   create(context) {
+    const options = Object.assign({}, defaultOptions, context.options[0])
+    const checkFragmentShorthand = options.checkFragmentShorthand
+
     function checkIteratorElement(node) {
       if (node.type === 'JSXElement' && !hasProp(node.openingElement.attributes, 'key')) {
         context.report({
           node,
           message: 'Missing "key" prop for element in iterator'
         });
-      } else if (node.type === 'JSXFragment') {
+      } else if (checkFragmentShorthand && node.type === 'JSXFragment') {
         context.report({
           node,
           message: 'Missing "key" prop for element in iterator. Shorthand fragment syntax does support providing keys'
@@ -58,6 +74,10 @@ module.exports = {
       },
 
       JSXFragment(node) {
+        if (!checkFragmentShorthand) {
+          return;
+        }
+        
         if (node.parent.type === 'ArrayExpression') {
           context.report({
             node,

tests/lib/rules/jsx-key.js

@@ -64,10 +64,12 @@ ruleTester.run('jsx-key', rule, {
   }, {
     code: '[1, 2, 3].map(x => <>{x}</>);',
     parser: parsers.BABEL_ESLINT,
+    options: [{checkFragmentShorthand: true}],
     errors: [{message: 'Missing "key" prop for element in iterator. Shorthand fragment syntax does support providing keys'}]
   }, {
     code: '[<></>];',
     parser: parsers.BABEL_ESLINT,
+    options: [{checkFragmentShorthand: true}],
     errors: [{message: 'Missing "key" prop for element in array. Shorthand fragment syntax does support providing keys'}]
   }]
 });