feat: add errorMessage for no-index

Author: dukeluo

.prettierrc.json

@@ -6,5 +6,6 @@
   "trailingComma": "es5",
   "bracketSpacing": true,
   "arrowParens": "always",
-  "embeddedLanguageFormatting": "auto"
+  "embeddedLanguageFormatting": "auto",
+  "endOfLine": "auto"
 }

docs/rules/no-index.md

@@ -31,15 +31,44 @@ If `true`, the rule will ignore the middle extensions of the filename.
 In some cases, you may want to ignore the middle extensions of the filename. For example, you want to lint the base name of the config files, e.g. `index.config.js`, you can do so by setting the `ignoreMiddleExtensions` option to `true`, and the rule will only validate its base name, in this case the base name will be `index`.
 
 ```js
-module.exports = {
-  plugins: ['check-file'],
-  rules: {
-    'check-file/no-index': [
-      'error',
-      {
-        ignoreMiddleExtensions: true,
-      },
-    ],
+export default [
+  {
+    plugins: {
+      'check-file': checkFile,
+    },
+    rules: {
+      'check-file/no-index': [
+        'error',
+        {
+          ignoreMiddleExtensions: true,
+        },
+      ],
+    },
   },
-};
+];
+```
+
+##### `errorMessage`
+
+Customizes the error message displayed when a file is being named "index". It offers one placeholder for dynamic content:
+
+- `{{ target }}`: Represents the filename of the blocked file.
+
+```js
+export default [
+  {
+    plugins: {
+      'check-file': checkFile,
+    },
+    rules: {
+      'check-file/no-index': [
+        'error',
+        {
+          errorMessage:
+            'The file "{{ target }}" is not allowed to be named "index", see contribute.md for details',
+        },
+      ],
+    },
+  },
+];
 ```

lib/rules/no-index.js

@@ -6,6 +6,7 @@
 import { NO_INDEX_ERROR_MESSAGE } from '../constants/message.js';
 import { getDocUrl } from '../utils/doc.js';
 import { getBasename, getFilePath, getFilename } from '../utils/filename.js';
+import { isNotEmpty } from '../utils/utility.js';
 
 /**
  * @type {import('eslint').Rule.RuleModule}
@@ -25,6 +26,7 @@ export default {
         type: 'object',
         properties: {
           ignoreMiddleExtensions: { type: 'boolean' },
+          errorMessage: { type: 'string' },
         },
       },
     ],
@@ -36,16 +38,26 @@ export default {
   create(context) {
     return {
       Program: (node) => {
-        const { ignoreMiddleExtensions } = context.options[0] || {};
+        const { ignoreMiddleExtensions, errorMessage } =
+          context.options[0] || {};
         const filenameWithPath = getFilePath(context);
         const filename = getFilename(filenameWithPath);
         const basename = getBasename(filename, ignoreMiddleExtensions);
 
         if (basename === 'index') {
-          context.report({
-            node,
-            messageId: 'noIndex',
-          });
+          errorMessage && isNotEmpty(errorMessage)
+            ? context.report({
+                node,
+                // eslint-disable-next-line eslint-plugin/prefer-message-ids
+                message: errorMessage,
+                data: {
+                  target: filename,
+                },
+              })
+            : context.report({
+                node,
+                messageId: 'noIndex',
+              });
           return;
         }
       },

tests/lib/rules/no-index.posix.js

@@ -131,3 +131,42 @@ ruleTester.run(
     ],
   }
 );
+
+ruleTester.run(
+  'no-index with option: [{ errorMessage: "The file {{ target }} is not allowed to be named index" }]',
+  rule,
+  {
+    valid: [
+      {
+        code: "var foo = 'bar';",
+        filename: 'index.config.ts',
+        options: [
+          {
+            errorMessage:
+              'The file {{ target }} is not allowed to be named index',
+          },
+        ],
+      },
+    ],
+
+    invalid: [
+      {
+        code: "var foo = 'bar';",
+        filename: 'src/utils/index.js',
+        options: [
+          {
+            errorMessage:
+              'The file {{ target }} is not allowed to be named index',
+          },
+        ],
+        errors: [
+          {
+            message: 'The file index.js is not allowed to be named index',
+            column: 1,
+            line: 1,
+          },
+        ],
+      },
+    ],
+  }
+);

tests/lib/rules/no-index.windows.js

@@ -131,3 +131,42 @@ ruleTester.run(
     ],
   }
 );
+
+ruleTester.run(
+  'no-index with option on Windows: [{ errorMessage: "The file {{ target }} is not allowed to be named index" }]',
+  rule,
+  {
+    valid: [
+      {
+        code: "var foo = 'bar';",
+        filename: 'index.config.ts',
+        options: [
+          {
+            errorMessage:
+              'The file {{ target }} is not allowed to be named index',
+          },
+        ],
+      },
+    ],
+
+    invalid: [
+      {
+        code: "var foo = 'bar';",
+        filename: 'src\\utils\\index.js',
+        options: [
+          {
+            errorMessage:
+              'The file {{ target }} is not allowed to be named index',
+          },
+        ],
+        errors: [
+          {
+            message: 'The file index.js is not allowed to be named index',
+            column: 1,
+            line: 1,
+          },
+        ],
+      },
+    ],
+  }
+);