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

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+/**
+ * @author Toru Nagashima
+ * @copyright 2016 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'disallow `key` attribute on `<template>`',
+      categories: ['vue3-essential', 'essential'],
+      url: 'https://eslint.vuejs.org/rules/no-template-key.html'
+    },
+    fixable: null,
+    schema: [],
+    messages: {
+      disallow:
+        "'<template>' cannot be keyed. Place the key on real elements instead."
+    }
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    return utils.defineTemplateBodyVisitor(context, {
+      /** @param {VElement} node */
+      "VElement[name='template']"(node) {
+        const keyNode =
+          utils.getAttribute(node, 'key') ||
+          utils.getDirective(node, 'bind', 'key')
+        if (keyNode) {
+          if (utils.hasDirective(node, 'for')) {
+            // It's valid for Vue.js 3.x.
+            // <template v-for="item in list" :key="item.id"> ... </template>
+            // see https://github.com/vuejs/vue-next/issues/1734
+            return
+          }
+          context.report({
+            node: keyNode,
+            loc: keyNode.loc,
+            messageId: 'disallow'
+          })
+        }
+      }
+    })
+  }
+}