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node_modules/eslint-plugin-vue/lib/rules/no-dupe-keys.js

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+/**
+ * @fileoverview Prevents duplication of field names.
+ * @author Armano
+ */
+'use strict'
+
+const utils = require('../utils')
+
+/**
+ * @typedef {import('../utils').GroupName} GroupName
+ */
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+/** @type {GroupName[]} */
+const GROUP_NAMES = ['props', 'computed', 'data', 'methods', 'setup']
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'disallow duplication of field names',
+      categories: ['vue3-essential', 'essential'],
+      url: 'https://eslint.vuejs.org/rules/no-dupe-keys.html'
+    },
+    fixable: null, // or "code" or "whitespace"
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          groups: {
+            type: 'array'
+          }
+        },
+        additionalProperties: false
+      }
+    ]
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    const options = context.options[0] || {}
+    const groups = new Set(GROUP_NAMES.concat(options.groups || []))
+
+    // ----------------------------------------------------------------------
+    // Public
+    // ----------------------------------------------------------------------
+
+    return utils.executeOnVue(context, (obj) => {
+      const usedNames = []
+      const properties = utils.iterateProperties(obj, groups)
+
+      for (const o of properties) {
+        if (usedNames.indexOf(o.name) !== -1) {
+          context.report({
+            node: o.node,
+            message: "Duplicated key '{{name}}'.",
+            data: {
+              name: o.name
+            }
+          })
+        }
+
+        usedNames.push(o.name)
+      }
+    })
+  }
+}