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Add vue/valid-define-emits rule
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‎docs/rules/README.md

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| [vue/v-for-delimiter-style](./v-for-delimiter-style.md) | enforce `v-for` directive's delimiter style | :wrench: |
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| [vue/v-on-event-hyphenation](./v-on-event-hyphenation.md) | enforce v-on event naming style on custom components in template | :wrench: |
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| [vue/v-on-function-call](./v-on-function-call.md) | enforce or forbid parentheses after method calls without arguments in `v-on` directives | :wrench: |
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| [vue/valid-define-emits](./valid-define-emits.md) | enforce valid `defineEmits` compiler macro | |
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| [vue/valid-define-props](./valid-define-props.md) | enforce valid `defineProps` compiler macro | |
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| [vue/valid-next-tick](./valid-next-tick.md) | enforce valid `nextTick` function calls | :wrench: |
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‎docs/rules/valid-define-emits.md

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---
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pageClass: rule-details
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sidebarDepth: 0
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title: vue/valid-define-emits
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description: enforce valid `defineEmits` compiler macro
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---
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# vue/valid-define-emits
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> enforce valid `defineEmits` compiler macro
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- :exclamation: <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
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This rule checks whether `defineEmits` compiler macro is valid.
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## :book: Rule Details
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This rule reports `defineEmits` compiler macros in the following cases:
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- `defineEmits` are referencing locally declared variables.
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- `defineEmits` has both a literal type and an argument. e.g. `defineEmits<(e: 'foo')=>void>(['bar'])`
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- `defineEmits` has been called multiple times.
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- Custom events are defined in both `defineEmits` and `export default {}`.
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- Custom events are not defined in either `defineEmits` or `export default {}`.
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<eslint-code-block :rules="{'vue/valid-define-emits': ['error']}">
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```vue
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<script setup>
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/* ✓ GOOD */
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defineEmits({ notify: null })
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</script>
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```
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</eslint-code-block>
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<eslint-code-block :rules="{'vue/valid-define-emits': ['error']}">
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```vue
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<script setup>
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/* ✓ GOOD */
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defineEmits(['notify'])
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</script>
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```
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</eslint-code-block>
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```vue
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<script setup lang="ts">
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/* ✓ GOOD */
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defineEmits<(e: 'notify')=>void>()
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</script>
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```
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<eslint-code-block :rules="{'vue/valid-define-emits': ['error']}">
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```vue
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<script>
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const def = { notify: null }
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</script>
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<script setup>
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/* ✓ GOOD */
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defineEmits(def)
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</script>
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```
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</eslint-code-block>
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<eslint-code-block :rules="{'vue/valid-define-emits': ['error']}">
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```vue
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<script setup>
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/* ✗ BAD */
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const def = { notify: null }
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defineEmits(def)
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</script>
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```
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</eslint-code-block>
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```vue
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<script setup lang="ts">
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/* ✗ BAD */
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defineEmits<(e: 'notify')=>void>({ submit: null })
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</script>
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```
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<eslint-code-block :rules="{'vue/valid-define-emits': ['error']}">
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```vue
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<script setup>
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/* ✗ BAD */
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defineEmits({ notify: null })
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defineEmits({ submit: null })
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</script>
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```
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</eslint-code-block>
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<eslint-code-block :rules="{'vue/valid-define-emits': ['error']}">
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```vue
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<script>
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export default {
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emits: { notify: null }
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}
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</script>
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<script setup>
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/* ✗ BAD */
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defineEmits({ submit: null })
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</script>
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```
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</eslint-code-block>
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<eslint-code-block :rules="{'vue/valid-define-emits': ['error']}">
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```vue
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<script setup>
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/* ✗ BAD */
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defineEmits()
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</script>
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```
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</eslint-code-block>
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## :wrench: Options
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Nothing.
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## :mag: Implementation
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- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/valid-define-emits.js)
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- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/valid-define-emits.js)

‎lib/index.js

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'v-on-function-call': require('./rules/v-on-function-call'),
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'v-on-style': require('./rules/v-on-style'),
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'v-slot-style': require('./rules/v-slot-style'),
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'valid-define-emits': require('./rules/valid-define-emits'),
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'valid-define-props': require('./rules/valid-define-props'),
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'valid-next-tick': require('./rules/valid-next-tick'),
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'valid-template-root': require('./rules/valid-template-root'),

‎lib/rules/valid-define-emits.js

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/**
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* @author Yosuke Ota <https://github.com/ota-meshi>
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* See LICENSE file in root directory for full license.
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*/
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'use strict'
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const { findVariable } = require('eslint-utils')
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const utils = require('../utils')
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module.exports = {
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meta: {
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type: 'problem',
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docs: {
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description: 'enforce valid `defineEmits` compiler macro',
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// TODO Switch in the major version.
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// categories: ['vue3-essential'],
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categories: undefined,
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url: 'https://eslint.vuejs.org/rules/valid-define-emits.html'
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},
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fixable: null,
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schema: [],
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messages: {
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hasTypeAndArg: '`defineEmits` has both a type-only emit and an argument.',
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referencingLocally:
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'`defineEmits` are referencing locally declared variables.',
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multiple: '`defineEmits` has been called multiple times.',
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notDefined: 'Custom events are not defined.',
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definedInBoth:
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'Custom events are defined in both `defineEmits` and `export default {}`.'
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}
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},
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/** @param {RuleContext} context */
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create(context) {
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const scriptSetup = utils.getScriptSetupElement(context)
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if (!scriptSetup) {
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return {}
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}
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/** @type {Set<Expression | SpreadElement>} */
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const emitsDefExpressions = new Set()
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let hasDefaultExport = false
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/** @type {CallExpression[]} */
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const defineEmitsNodes = []
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/** @type {CallExpression | null} */
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let emptyDefineEmits = null
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return utils.compositingVisitors(
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utils.defineScriptSetupVisitor(context, {
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onDefineEmitsEnter(node) {
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defineEmitsNodes.push(node)
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if (node.arguments.length >= 1) {
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if (node.typeParameters && node.typeParameters.params.length >= 1) {
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// `defineEmits` has both a literal type and an argument.
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context.report({
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node,
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messageId: 'hasTypeAndArg'
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})
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return
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}
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emitsDefExpressions.add(node.arguments[0])
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} else {
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if (
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!node.typeParameters ||
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node.typeParameters.params.length === 0
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) {
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emptyDefineEmits = node
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}
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}
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},
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Identifier(node) {
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for (const def of emitsDefExpressions) {
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if (utils.inRange(def.range, node)) {
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const variable = findVariable(context.getScope(), node)
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if (
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variable &&
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variable.references.some((ref) => ref.identifier === node)
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) {
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if (
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variable.defs.length &&
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variable.defs.every((def) =>
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utils.inRange(scriptSetup.range, def.name)
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)
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) {
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//`defineEmits` are referencing locally declared variables.
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context.report({
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node,
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messageId: 'referencingLocally'
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})
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}
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}
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}
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}
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}
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}),
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utils.defineVueVisitor(context, {
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onVueObjectEnter(node, { type }) {
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if (type !== 'export' || utils.inRange(scriptSetup.range, node)) {
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return
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}
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hasDefaultExport = Boolean(utils.findProperty(node, 'emits'))
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}
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}),
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{
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'Program:exit'() {
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if (!defineEmitsNodes.length) {
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return
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}
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if (defineEmitsNodes.length > 1) {
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// `defineEmits` has been called multiple times.
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for (const node of defineEmitsNodes) {
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context.report({
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node,
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messageId: 'multiple'
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})
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}
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return
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}
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if (emptyDefineEmits) {
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if (!hasDefaultExport) {
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// Custom events are not defined.
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context.report({
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node: emptyDefineEmits,
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messageId: 'notDefined'
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})
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}
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} else {
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if (hasDefaultExport) {
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// Custom events are defined in both `defineEmits` and `export default {}`.
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for (const node of defineEmitsNodes) {
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context.report({
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node,
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messageId: 'definedInBoth'
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})
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}
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}
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}
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}
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}
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)
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}
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}

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