feat(no-reserved-component-names): add case sensitive option

docs/rules/no-reserved-component-names.md

@@ -35,13 +35,15 @@ export default {
 {
   "vue/no-reserved-component-names": ["error", {
     "disallowVueBuiltInComponents": false,
-    "disallowVue3BuiltInComponents": false
+    "disallowVue3BuiltInComponents": false,
+    "htmlElementCaseSensitive": false,
   }]
 }
 ```
 
 - `disallowVueBuiltInComponents` (`boolean`) ... If `true`, disallow Vue.js 2.x built-in component names. Default is `false`.
 - `disallowVue3BuiltInComponents` (`boolean`) ... If `true`, disallow Vue.js 3.x built-in component names. Default is `false`.
+- `htmlElementCaseSensitive` (`boolean`) ... If `true`, component names must exactly match the case of an HTML element to be considered conflicting. Default is `false` (i.e. case-insensitve comparison).
 
 ### `"disallowVueBuiltInComponents": true`
 
@@ -73,6 +75,34 @@ export default {
 
 </eslint-code-block>
 
+### `"htmlElementCaseSensitive": true`
+
+<eslint-code-block :rules="{'vue/no-reserved-component-names': ['error', {htmlElementCaseSensitive: true}]}">
+
+```vue
+<script>
+/* ✓ GOOD */
+export default {
+  name: 'Button'
+}
+</script>
+```
+
+</eslint-code-block>
+
+<eslint-code-block :rules="{'vue/no-reserved-component-names': ['error', {htmlElementCaseSensitive: true}]}">
+
+```vue
+<script>
+/* ✗ BAD */
+export default {
+  name: 'button'
+}
+</script>
+```
+
+</eslint-code-block>
+
 ## :couple: Related Rules
 
 - [vue/multi-word-component-names](./multi-word-component-names.md)

lib/rules/no-reserved-component-names.js

@@ -34,19 +34,6 @@ function isLowercase(word) {
   return /^[a-z]*$/.test(word)
 }
 
-const RESERVED_NAMES_IN_HTML = new Set([
-  ...htmlElements,
-  ...htmlElements.map(casing.capitalize)
-])
-const RESERVED_NAMES_IN_OTHERS = new Set([
-  ...deprecatedHtmlElements,
-  ...deprecatedHtmlElements.map(casing.capitalize),
-  ...kebabCaseElements,
-  ...kebabCaseElements.map(casing.pascalCase),
-  ...svgElements,
-  ...svgElements.filter(isLowercase).map(casing.capitalize)
-])
-
 /**
  * @param {Expression | SpreadElement} node
  * @returns {node is (Literal | TemplateLiteral)}
@@ -61,14 +48,14 @@ function canVerify(node) {
 }
 
 /**
- * @param {string} name
- * @returns {string}
+ * @template T
+ * @param {Set<T>} set
+ * @param {Iterable<T>} iterable
  */
-function getMessageId(name) {
-  if (RESERVED_NAMES_IN_HTML.has(name)) return 'reservedInHtml'
-  if (RESERVED_NAMES_IN_VUE.has(name)) return 'reservedInVue'
-  if (RESERVED_NAMES_IN_VUE3.has(name)) return 'reservedInVue3'
-  return 'reserved'
+function addAll(set, iterable) {
+  for (const element of iterable) {
+    set.add(element)
+  }
 }
 
 module.exports = {
@@ -90,6 +77,9 @@ module.exports = {
           },
           disallowVue3BuiltInComponents: {
             type: 'boolean'
+          },
+          htmlElementCaseSensitive: {
+            type: 'boolean'
           }
         },
         additionalProperties: false
@@ -109,6 +99,23 @@ module.exports = {
       options.disallowVueBuiltInComponents === true
     const disallowVue3BuiltInComponents =
       options.disallowVue3BuiltInComponents === true
+    const htmlElementCaseSensitive = options.htmlElementCaseSensitive === true
+
+    const RESERVED_NAMES_IN_HTML = new Set(htmlElements)
+    const RESERVED_NAMES_IN_OTHERS = new Set([
+      ...deprecatedHtmlElements,
+      ...kebabCaseElements,
+      ...svgElements
+    ])
+
+    if (!htmlElementCaseSensitive) {
+      addAll(RESERVED_NAMES_IN_HTML, htmlElements.map(casing.capitalize))
+      addAll(RESERVED_NAMES_IN_OTHERS, [
+        ...deprecatedHtmlElements.map(casing.capitalize),
+        ...kebabCaseElements.map(casing.pascalCase),
+        ...svgElements.filter(isLowercase).map(casing.capitalize)
+      ])
+    }
 
     const reservedNames = new Set([
       ...RESERVED_NAMES_IN_HTML,
@@ -117,6 +124,17 @@ module.exports = {
       ...RESERVED_NAMES_IN_OTHERS
     ])
 
+    /**
+     * @param {string} name
+     * @returns {string}
+     */
+    function getMessageId(name) {
+      if (RESERVED_NAMES_IN_HTML.has(name)) return 'reservedInHtml'
+      if (RESERVED_NAMES_IN_VUE.has(name)) return 'reservedInVue'
+      if (RESERVED_NAMES_IN_VUE3.has(name)) return 'reservedInVue3'
+      return 'reserved'
+    }
+
     /**
      * @param {Literal | TemplateLiteral} node
      */

tests/lib/rules/no-reserved-component-names.js

@@ -410,6 +410,16 @@ const invalidElements = [
   'xmp',
   'Xmp'
 ]
+const invalidLowerCaseElements = []
+const invalidUpperCaseElements = []
+
+for (const element of invalidElements) {
+  if (element[0] === element[0].toLowerCase()) {
+    invalidLowerCaseElements.push(element)
+  } else {
+    invalidUpperCaseElements.push(element)
+  }
+}
 
 const vue2BuiltInComponents = [
   'component',
@@ -559,6 +569,16 @@ ruleTester.run('no-reserved-component-names', rule, {
       languageOptions,
       options: [{ disallowVueBuiltInComponents: true }]
     })),
+    ...invalidUpperCaseElements.map((name) => ({
+      filename: `${name}.vue`,
+      code: `
+          export default {
+            name: '${name}'
+          }
+        `,
+      languageOptions,
+      options: [{ htmlElementCaseSensitive: true }]
+    })),
     {
       filename: 'test.vue',
       code: `<script setup> defineOptions({}) </script>`,
@@ -701,6 +721,24 @@ ruleTester.run('no-reserved-component-names', rule, {
         }
       ]
     })),
+    ...invalidLowerCaseElements.map((name) => ({
+      filename: `${name}.vue`,
+      code: `<script setup> defineOptions({name: '${name}'}) </script>`,
+      languageOptions: {
+        parser: require('vue-eslint-parser'),
+        ...languageOptions
+      },
+      options: [{ htmlElementCaseSensitive: true }],
+      errors: [
+        {
+          messageId: RESERVED_NAMES_IN_HTML.has(name)
+            ? 'reservedInHtml'
+            : 'reserved',
+          data: { name },
+          line: 1
+        }
+      ]
+    })),
     ...vue2BuiltInComponents.map((name) => ({
       filename: `${name}.vue`,
       code: `