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Add vue/require-default-export rule (#2494)
Co-authored-by: Flo Edelmann <git@flo-edelmann.de>
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‎docs/rules/index.md‎

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@@ -268,6 +268,7 @@ For example:
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| [vue/prefer-prop-type-boolean-first](./prefer-prop-type-boolean-first.md) | enforce `Boolean` comes first in component prop types | :bulb: | :warning: |
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| [vue/prefer-separate-static-class](./prefer-separate-static-class.md) | require static class names in template to be in a separate `class` attribute | :wrench: | :hammer: |
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| [vue/prefer-true-attribute-shorthand](./prefer-true-attribute-shorthand.md) | require shorthand form attribute when `v-bind` value is `true` | :bulb: | :hammer: |
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| [vue/require-default-export](./require-default-export.md) | require components to be the default export | | :warning: |
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| [vue/require-direct-export](./require-direct-export.md) | require the component to be directly exported | | :hammer: |
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| [vue/require-emit-validator](./require-emit-validator.md) | require type definitions in emits | :bulb: | :hammer: |
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| [vue/require-explicit-slots](./require-explicit-slots.md) | require slots to be explicitly defined | | :warning: |

‎docs/rules/one-component-per-file.md‎

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Nothing.
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## :couple: Related Rules
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- [vue/require-default-export](./require-default-export.md)
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## :books: Further Reading
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- [Style guide - Component files](https://vuejs.org/style-guide/rules-strongly-recommended.html#component-files)

‎docs/rules/require-default-export.md‎

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---
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pageClass: rule-details
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sidebarDepth: 0
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title: vue/require-default-export
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description: require components to be the default export
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---
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# vue/require-default-export
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> require components to be the default export
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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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## :book: Rule Details
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This rule reports when a Vue component does not have a default export, if the component is not defined as `<script setup>`.
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<eslint-code-block :rules="{'vue/require-default-export': ['error']}">
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```vue
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<!-- ✗ BAD -->
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<script>
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const foo = 'foo';
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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/require-default-export': ['error']}">
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```vue
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<!-- ✓ GOOD -->
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<script>
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export default {
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data() {
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return {
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foo: 'foo'
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};
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}
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};
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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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## :couple: Related Rules
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- [vue/one-component-per-file](./one-component-per-file.md)
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## :mag: Implementation
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- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/require-default-export.js)
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- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/require-default-export.js)

‎lib/index.js‎

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'prop-name-casing': require('./rules/prop-name-casing'),
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'quote-props': require('./rules/quote-props'),
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'require-component-is': require('./rules/require-component-is'),
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'require-default-export': require('./rules/require-default-export'),
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'require-default-prop': require('./rules/require-default-prop'),
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'require-direct-export': require('./rules/require-direct-export'),
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'require-emit-validator': require('./rules/require-emit-validator'),

‎lib/rules/require-default-export.js‎

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/**
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* @author ItMaga
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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 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: 'require components to be the default export',
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categories: undefined,
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url: 'https://eslint.vuejs.org/rules/require-default-export.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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missing: 'Missing default export.',
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mustBeDefaultExport: 'Component must be the default export.'
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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 sourceCode = context.getSourceCode()
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const documentFragment = sourceCode.parserServices.getDocumentFragment?.()
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const hasScript =
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documentFragment &&
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documentFragment.children.some(
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(e) => utils.isVElement(e) && e.name === 'script'
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)
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if (utils.isScriptSetup(context) || !hasScript) {
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return {}
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}
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let hasDefaultExport = false
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let hasDefinedComponent = false
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return utils.compositingVisitors(
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utils.defineVueVisitor(context, {
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onVueObjectExit() {
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hasDefinedComponent = true
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}
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}),
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{
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'Program > ExportDefaultDeclaration'() {
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hasDefaultExport = true
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},
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/**
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* @param {Program} node
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*/
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'Program:exit'(node) {
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if (!hasDefaultExport && node.body.length > 0) {
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context.report({
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loc: node.tokens[node.tokens.length - 1].loc,
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messageId: hasDefinedComponent ? 'mustBeDefaultExport' : 'missing'
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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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}

‎tests/lib/rules/require-default-export.js‎

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/**
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* @author ItMaga
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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 RuleTester = require('../../eslint-compat').RuleTester
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const rule = require('../../../lib/rules/require-default-export')
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const tester = new RuleTester({
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languageOptions: {
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parser: require('vue-eslint-parser'),
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ecmaVersion: 2020,
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sourceType: 'module'
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}
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})
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tester.run('require-default-export', rule, {
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valid: [
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{
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filename: 'test.vue',
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code: `
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<template>Without script</template>
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`
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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import { ref } from 'vue';
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export default {}
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</script>
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`
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},
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{
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filename: 'test.vue',
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code: `
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<script setup>
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const foo = 'foo';
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</script>
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`
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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const component = {};
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export default component;
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</script>
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`
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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import {defineComponent} from 'vue';
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export default defineComponent({});
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</script>
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`
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},
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{
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filename: 'test.js',
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code: `
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const foo = 'foo';
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export const bar = 'bar';
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`
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},
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{
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filename: 'test.js',
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code: `
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import {defineComponent} from 'vue';
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defineComponent({});
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`
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}
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],
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invalid: [
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{
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filename: 'test.vue',
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code: `
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<script>
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const foo = 'foo';
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</script>
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`,
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errors: [
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{
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messageId: 'missing',
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line: 4,
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endLine: 4,
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column: 7,
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endColumn: 16
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}
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]
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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export const foo = 'foo';
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</script>
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`,
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errors: [
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{
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messageId: 'missing',
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line: 4,
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endLine: 4,
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column: 7,
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endColumn: 16
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}
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]
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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const foo = 'foo';
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export { foo };
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</script>
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`,
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errors: [
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{
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messageId: 'missing',
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line: 6,
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endLine: 6,
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column: 7,
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endColumn: 16
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}
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]
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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export const foo = 'foo';
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export const bar = 'bar';
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</script>
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`,
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errors: [
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{
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messageId: 'missing',
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line: 5,
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endLine: 5,
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column: 7,
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endColumn: 16
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}
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]
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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import { defineComponent } from 'vue';
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export const component = defineComponent({});
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</script>
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`,
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errors: [
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{
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messageId: 'mustBeDefaultExport',
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line: 6,
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endLine: 6,
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column: 7,
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endColumn: 16
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}
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]
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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import Vue from 'vue';
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const component = Vue.component('foo', {});
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</script>
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`,
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errors: [
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{
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messageId: 'mustBeDefaultExport',
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line: 6,
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endLine: 6,
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column: 7,
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endColumn: 16
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}
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]
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}
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]
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})

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