| 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) |
| }) |
|
|
