Support Nuxt.js's asyncData in various rules

lib/rules/no-dupe-keys.js

@@ -14,7 +14,7 @@ const utils = require('../utils')
 // Rule Definition
 // ------------------------------------------------------------------------------
 /** @type {GroupName[]} */
-const GROUP_NAMES = ['props', 'computed', 'data', 'methods', 'setup']
+const GROUP_NAMES = ['props', 'computed', 'data', 'asyncData', 'methods', 'setup']
 
 module.exports = {
   meta: {

lib/rules/no-reserved-keys.js

@@ -16,7 +16,7 @@ const utils = require('../utils')
 
 const RESERVED_KEYS = require('../utils/vue-reserved.json')
 /** @type {GroupName[]} */
-const GROUP_NAMES = ['props', 'computed', 'data', 'methods', 'setup']
+const GROUP_NAMES = ['props', 'computed', 'data', 'asyncData', 'methods', 'setup']
 
 module.exports = {
   meta: {
@@ -76,7 +76,7 @@ module.exports = {
       utils.executeOnVue(context, (obj) => {
         const properties = utils.iterateProperties(obj, groups)
         for (const o of properties) {
-          if (o.groupName === 'data' && o.name[0] === '_') {
+          if ((o.groupName === 'data' || o.groupName === 'asyncData') && o.name[0] === '_') {
             context.report({
               node: o.node,
               messageId: 'startsWithUnderscore',

lib/rules/no-template-shadow.js

@@ -19,7 +19,7 @@ const utils = require('../utils')
 // ------------------------------------------------------------------------------
 
 /** @type {GroupName[]} */
-const GROUP_NAMES = ['props', 'computed', 'data', 'methods', 'setup']
+const GROUP_NAMES = ['props', 'computed', 'data', 'asyncData', 'methods', 'setup']
 
 module.exports = {
   meta: {

lib/rules/no-undef-properties.js

@@ -32,6 +32,7 @@ const {
 // ------------------------------------------------------------------------------
 
 const GROUP_PROPERTY = 'props'
+const GROUP_ASYNC_DATA = 'asyncData' // Nuxt.js
 const GROUP_DATA = 'data'
 const GROUP_COMPUTED_PROPERTY = 'computed'
 const GROUP_METHODS = 'methods'
@@ -334,6 +335,7 @@ module.exports = {
             node,
             new Set([
               GROUP_PROPERTY,
+              GROUP_ASYNC_DATA,
               GROUP_DATA,
               GROUP_COMPUTED_PROPERTY,
               GROUP_SETUP,
@@ -342,7 +344,10 @@ module.exports = {
             ])
           )) {
             const propertyMap =
-              prop.groupName === GROUP_DATA &&
+              (
+                prop.groupName === GROUP_DATA ||
+                prop.groupName === GROUP_ASYNC_DATA
+              ) &&
               prop.type === 'object' &&
               prop.property.value.type === 'ObjectExpression'
                 ? getObjectPropertyMap(prop.property.value)

lib/rules/no-unused-properties.js

@@ -55,6 +55,7 @@ const {
 
 const GROUP_PROPERTY = 'props'
 const GROUP_DATA = 'data'
+const GROUP_ASYNC_DATA = 'asyncData'
 const GROUP_COMPUTED_PROPERTY = 'computed'
 const GROUP_METHODS = 'methods'
 const GROUP_SETUP = 'setup'
@@ -64,6 +65,7 @@ const GROUP_EXPOSE = 'expose'
 const PROPERTY_LABEL = {
   props: 'property',
   data: 'data',
+  asyncData: 'async data',
   computed: 'computed property',
   methods: 'method',
   setup: 'property returned from `setup()`',
@@ -213,6 +215,7 @@ module.exports = {
               enum: [
                 GROUP_PROPERTY,
                 GROUP_DATA,
+                GROUP_ASYNC_DATA,
                 GROUP_COMPUTED_PROPERTY,
                 GROUP_METHODS,
                 GROUP_SETUP
@@ -350,7 +353,7 @@ module.exports = {
             // used
             if (
               deepData &&
-              property.groupName === 'data' &&
+              (property.groupName === 'data' || property.groupName === 'asyncData') &&
               property.type === 'object'
             ) {
               // Check the deep properties of the data option.

lib/utils/index.js

@@ -23,7 +23,7 @@
  * @typedef { {key: string | null, value: BlockStatement | null} } ComponentComputedProperty
  */
 /**
- * @typedef { 'props' | 'data' | 'computed' | 'setup' | 'watch' | 'methods' | 'provide' | 'inject' | 'expose' } GroupName
+ * @typedef { 'props' | 'asyncData' | 'data' | 'computed' | 'setup' | 'watch' | 'methods' | 'provide' | 'inject' | 'expose' } GroupName
  * @typedef { { type: 'array',  name: string, groupName: GroupName, node: Literal | TemplateLiteral } } ComponentArrayPropertyData
  * @typedef { { type: 'object', name: string, groupName: GroupName, node: Identifier | Literal | TemplateLiteral, property: Property } } ComponentObjectPropertyData
  * @typedef { ComponentArrayPropertyData | ComponentObjectPropertyData } ComponentPropertyData

tests/lib/rules/no-dupe-keys.js

@@ -709,6 +709,29 @@ ruleTester.run('no-dupe-keys', rule, {
         }
       ]
     },
+    {
+      filename: 'test.vue',
+      code: `
+        export default {
+          asyncData() {
+            return {
+              foo: 1
+            }
+          },
+          data() {
+            return {
+              foo: 2
+            }
+          },
+        }
+      `,
+      errors: [
+        {
+          message: "Duplicated key 'foo'.",
+          line: 10
+        }
+      ]
+    },
     {
       filename: 'test.js',
       code: `

tests/lib/rules/no-reserved-keys.js

@@ -156,6 +156,25 @@ ruleTester.run('no-reserved-keys', rule, {
         }
       ]
     },
+    {
+      filename: 'test.js',
+      code: `
+        new Vue({
+          asyncData () {
+            return {
+              $el: ''
+            }
+          }
+        })
+      `,
+      parserOptions: { ecmaVersion: 6 },
+      errors: [
+        {
+          message: "Key '$el' is reserved.",
+          line: 5
+        }
+      ]
+    },
     {
       filename: 'test.js',
       code: `
@@ -209,6 +228,23 @@ ruleTester.run('no-reserved-keys', rule, {
         }
       ]
     },
+    {
+      filename: 'test.js',
+      code: `
+        new Vue({
+          asyncData: () => ({
+            _foo: String
+          })
+        })
+      `,
+      parserOptions: { ecmaVersion: 6 },
+      errors: [
+        {
+          message: "Keys starting with '_' are reserved in '_foo' group.",
+          line: 4
+        }
+      ]
+    },
     {
       filename: 'test.js',
       code: `

tests/lib/rules/no-template-shadow.js

@@ -250,6 +250,28 @@ ruleTester.run('no-template-shadow', rule, {
         }
       ]
     },
+    {
+      filename: 'test.vue',
+      code: `<template>
+        <div v-for="i in 5"></div>
+      </template>
+      <script>
+        export default {
+          asyncData() {
+            return {
+              i: 27,
+            }
+          }
+        }
+      </script>`,
+      errors: [
+        {
+          message: "Variable 'i' is already declared in the upper scope.",
+          type: 'Identifier',
+          line: 2
+        }
+      ]
+    },
     {
       filename: 'test.vue',
       code: `<template>

tests/lib/rules/no-undef-properties.js

@@ -67,6 +67,23 @@ tester.run('no-undef-properties', rule, {
       </script>
       `
     },
+    {
+      filename: 'test.vue',
+      code: `
+      <template>
+        <div> {{ foo }} </div>
+      </template>
+      <script>
+        export default {
+          asyncData() {
+            return {
+              foo: 42
+            }
+          },
+        };
+      </script>
+      `
+    },
     //default ignores
     {
       filename: 'test.vue',

tests/lib/rules/no-unused-properties.js

@@ -16,7 +16,7 @@ const tester = new RuleTester({
 })
 
 const allOptions = [
-  { groups: ['props', 'computed', 'data', 'methods', 'setup'] }
+  { groups: ['props', 'computed', 'data', 'asyncData', 'methods', 'setup'] }
 ]
 const deepDataOptions = [{ groups: ['data'], deepData: true }]
 
@@ -647,6 +647,26 @@ tester.run('no-unused-properties', rule, {
       options: allOptions
     },
 
+    // async data passed in a component
+    {
+      filename: 'test.vue',
+      code: `
+        <template>
+          <counter :count="foo" />
+        </template>
+        <script>
+          export default {
+            asyncData() {
+              return {
+                foo: 2
+              }
+            }
+          }
+        </script>
+      `,
+      options: allOptions
+    },
+
     // ignores unused data when marked with eslint-disable
     {
       filename: 'test.vue',
@@ -1709,6 +1729,32 @@ tester.run('no-unused-properties', rule, {
       ]
     },
 
+    // unused async data
+    {
+      filename: 'test.vue',
+      code: `
+        <template>
+          <div>{{ cont }}</div>
+        </template>
+        <script>
+          export default {
+            asyncData () {
+              return {
+                count: 2
+              };
+            }
+          };
+        </script>
+      `,
+      options: [{ groups: ['props', 'computed', 'data', 'asyncData'] }],
+      errors: [
+        {
+          message: "'count' of async data found, but never used.",
+          line: 9
+        }
+      ]
+    },
+
     // unused computed property
     {
       filename: 'test.vue',