| import { RuleTester as ESLintTesterV8 } from 'eslint-v8' | |
| import { RuleTester as ESLintTesterV9 } from 'eslint' | |
| import { rules } from '@next/eslint-plugin-next' | |
| const NextESLintRule = rules['no-duplicate-head'] | |
| const message = | |
| 'Do not include multiple instances of `<Head/>`. See: https://nextjs.org/docs/messages/no-duplicate-head' | |
| const tests = { | |
| valid: [ | |
| { | |
| code: `import Document, { Html, Head, Main, NextScript } from 'next/document' | |
| class MyDocument extends Document { | |
| static async getInitialProps(ctx) { | |
| //... | |
| } | |
| render() { | |
| return ( | |
| <Html> | |
| <Head/> | |
| </Html> | |
| ) | |
| } | |
| } | |
| export default MyDocument | |
| `, | |
| filename: 'pages/_document.js', | |
| }, | |
| { | |
| code: `import Document, { Html, Head, Main, NextScript } from 'next/document' | |
| class MyDocument extends Document { | |
| render() { | |
| return ( | |
| <Html> | |
| <Head> | |
| <meta charSet="utf-8" /> | |
| <link | |
| href="https://fonts.googleapis.com/css2?family=Sarabun:ital,wght@0,400;0,700;1,400;1,700&display=swap" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| </Html> | |
| ) | |
| } | |
| } | |
| export default MyDocument | |
| `, | |
| filename: 'pages/_document.tsx', | |
| }, | |
| ], | |
| invalid: [ | |
| { | |
| code: ` | |
| import Document, { Html, Main, NextScript } from 'next/document' | |
| import Head from 'next/head' | |
| class MyDocument extends Document { | |
| render() { | |
| return ( | |
| <Html> | |
| <Head /> | |
| <Head /> | |
| <Head /> | |
| </Html> | |
| ) | |
| } | |
| } | |
| export default MyDocument | |
| `, | |
| filename: 'pages/_document.js', | |
| errors: [ | |
| { | |
| message, | |
| type: 'JSXElement', | |
| }, | |
| { | |
| message, | |
| type: 'JSXElement', | |
| }, | |
| ], | |
| }, | |
| { | |
| code: ` | |
| import Document, { Html, Main, NextScript } from 'next/document' | |
| import Head from 'next/head' | |
| class MyDocument extends Document { | |
| render() { | |
| return ( | |
| <Html> | |
| <Head> | |
| <meta charSet="utf-8" /> | |
| <link | |
| href="https://fonts.googleapis.com/css2?family=Sarabun:ital,wght@0,400;0,700;1,400;1,700&display=swap" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| <body> | |
| <Main /> | |
| <NextScript /> | |
| </body> | |
| <Head> | |
| <script | |
| dangerouslySetInnerHTML={{ | |
| __html: '', | |
| }} | |
| /> | |
| </Head> | |
| </Html> | |
| ) | |
| } | |
| } | |
| export default MyDocument | |
| `, | |
| filename: 'pages/_document.page.tsx', | |
| errors: [ | |
| { | |
| message, | |
| type: 'JSXElement', | |
| }, | |
| ], | |
| }, | |
| ], | |
| } | |
| describe('no-duplicate-head', () => { | |
| new ESLintTesterV8({ | |
| parserOptions: { | |
| ecmaVersion: 2018, | |
| sourceType: 'module', | |
| ecmaFeatures: { | |
| modules: true, | |
| jsx: true, | |
| }, | |
| }, | |
| }).run('eslint-v8', NextESLintRule, tests) | |
| new ESLintTesterV9({ | |
| languageOptions: { | |
| ecmaVersion: 2018, | |
| sourceType: 'module', | |
| parserOptions: { | |
| ecmaFeatures: { | |
| modules: true, | |
| jsx: true, | |
| }, | |
| }, | |
| }, | |
| }).run('eslint-v9', NextESLintRule, tests) | |
| }) | |