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app_vue/node_modules/eslint-plugin-vue/lib/rules/no-useless-template-attributes.js

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+/**
+ * @author Yosuke Ota
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Helpers
+// ------------------------------------------------------------------------------
+
+// https://github.com/vuejs/vue-next/blob/64e2f4643602c5980361e66674141e61ba60ef70/packages/compiler-core/src/parse.ts#L405
+const SPECIAL_TEMPLATE_DIRECTIVES = new Set([
+  'if',
+  'else',
+  'else-if',
+  'for',
+  'slot'
+])
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'disallow useless attribute on `<template>`',
+      categories: ['vue3-essential', 'essential'],
+      url: 'https://eslint.vuejs.org/rules/no-useless-template-attributes.html'
+    },
+    fixable: null,
+    schema: [],
+    messages: {
+      unexpectedAttr: 'Unexpected useless attribute on `<template>`.',
+      unexpectedDir: 'Unexpected useless directive on `<template>`.'
+    }
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    /**
+     * @param {VAttribute | VDirective} attr
+     */
+    function getKeyName(attr) {
+      if (attr.directive) {
+        if (attr.key.name.name !== 'bind') {
+          // no v-bind
+          return null
+        }
+        if (
+          !attr.key.argument ||
+          attr.key.argument.type === 'VExpressionContainer'
+        ) {
+          // unknown
+          return null
+        }
+        return attr.key.argument.name
+      }
+      return attr.key.name
+    }
+
+    /**
+     * @param {VAttribute | VDirective} attr
+     */
+    function isFragmentTemplateAttribute(attr) {
+      if (attr.directive) {
+        const directiveName = attr.key.name.name
+        if (SPECIAL_TEMPLATE_DIRECTIVES.has(directiveName)) {
+          return true
+        }
+        if (directiveName === 'slot-scope') {
+          // `slot-scope` is deprecated in Vue.js 2.6
+          return true
+        }
+        if (directiveName === 'scope') {
+          // `scope` is deprecated in Vue.js 2.5
+          return true
+        }
+      }
+
+      const keyName = getKeyName(attr)
+      if (keyName === 'slot') {
+        // `slot` is deprecated in Vue.js 2.6
+        return true
+      }
+
+      return false
+    }
+
+    return utils.defineTemplateBodyVisitor(context, {
+      /** @param {VStartTag} node */
+      "VElement[name='template'][parent.type='VElement'] > VStartTag"(node) {
+        if (!node.attributes.some(isFragmentTemplateAttribute)) {
+          return
+        }
+
+        for (const attr of node.attributes) {
+          if (isFragmentTemplateAttribute(attr)) {
+            continue
+          }
+          const keyName = getKeyName(attr)
+          if (keyName === 'key') {
+            continue
+          }
+          context.report({
+            node: attr,
+            messageId: attr.directive ? 'unexpectedDir' : 'unexpectedAttr'
+          })
+        }
+      }
+    })
+  }
+}