| import { RuleTester as ESLintTesterV8 } from 'eslint-v8' | |
| import { RuleTester as ESLintTesterV9 } from 'eslint' | |
| import { rules } from '@next/eslint-plugin-next' | |
| const NextESLintRule = rules['google-font-display'] | |
| const tests = { | |
| valid: [ | |
| `import Head from "next/head"; | |
| export default Test = () => { | |
| return ( | |
| <Head> | |
| <link href={test} rel="test" /> | |
| <link | |
| href={process.env.NEXT_PUBLIC_CANONICAL_URL} | |
| rel="canonical" | |
| /> | |
| <link | |
| href={new URL("../public/favicon.ico", import.meta.url).toString()} | |
| rel="icon" | |
| /> | |
| <link | |
| href="https://fonts.googleapis.com/css2?family=Krona+One&display=optional" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| ); | |
| }; | |
| `, | |
| `import Document, { Html, Head } from "next/document"; | |
| class MyDocument extends Document { | |
| render() { | |
| return ( | |
| <Html> | |
| <Head> | |
| <link | |
| href="https://fonts.googleapis.com/css?family=Krona+One&display=swap" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| </Html> | |
| ); | |
| } | |
| } | |
| export default MyDocument; | |
| `, | |
| `import Document, { Html, Head } from "next/document"; | |
| class MyDocument extends Document { | |
| render() { | |
| return ( | |
| <Html> | |
| <Head> | |
| <link | |
| href="https://fonts.googleapis.com/css?family=Krona+One&display=swap" | |
| rel="stylesheet" | |
| crossOrigin="" | |
| /> | |
| </Head> | |
| </Html> | |
| ); | |
| } | |
| } | |
| export default MyDocument; | |
| `, | |
| ], | |
| invalid: [ | |
| { | |
| code: `import Head from "next/head"; | |
| export default Test = () => { | |
| return ( | |
| <Head> | |
| <link | |
| href="https://fonts.googleapis.com/css2?family=Krona+One" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| ); | |
| }; | |
| `, | |
| errors: [ | |
| { | |
| message: | |
| 'A font-display parameter is missing (adding `&display=optional` is recommended). See: https://nextjs.org/docs/messages/google-font-display', | |
| type: 'JSXOpeningElement', | |
| }, | |
| ], | |
| }, | |
| { | |
| code: `import Head from "next/head"; | |
| export default Test = () => { | |
| return ( | |
| <Head> | |
| <link | |
| href="https://fonts.googleapis.com/css2?family=Krona+One&display=block" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| ); | |
| }; | |
| `, | |
| errors: [ | |
| { | |
| message: | |
| 'Block is not recommended. See: https://nextjs.org/docs/messages/google-font-display', | |
| type: 'JSXOpeningElement', | |
| }, | |
| ], | |
| }, | |
| { | |
| code: `import Head from "next/head"; | |
| export default Test = () => { | |
| return ( | |
| <Head> | |
| <link | |
| href="https://fonts.googleapis.com/css2?family=Krona+One&display=auto" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| ); | |
| }; | |
| `, | |
| errors: [ | |
| { | |
| message: | |
| 'Auto is not recommended. See: https://nextjs.org/docs/messages/google-font-display', | |
| type: 'JSXOpeningElement', | |
| }, | |
| ], | |
| }, | |
| { | |
| code: `import Head from "next/head"; | |
| export default Test = () => { | |
| return ( | |
| <Head> | |
| <link | |
| href="https://fonts.googleapis.com/css2?display=fallback&family=Krona+One" | |
| rel="stylesheet" | |
| /> | |
| </Head> | |
| ); | |
| }; | |
| `, | |
| errors: [ | |
| { | |
| message: | |
| 'Fallback is not recommended. See: https://nextjs.org/docs/messages/google-font-display', | |
| type: 'JSXOpeningElement', | |
| }, | |
| ], | |
| }, | |
| ], | |
| } | |
| describe('google-font-display', () => { | |
| new ESLintTesterV8({ | |
| parserOptions: { | |
| ecmaVersion: 2020, | |
| sourceType: 'module', | |
| ecmaFeatures: { | |
| modules: true, | |
| jsx: true, | |
| }, | |
| }, | |
| }).run('eslint-v8', NextESLintRule, tests) | |
| new ESLintTesterV9({ | |
| languageOptions: { | |
| ecmaVersion: 2020, | |
| sourceType: 'module', | |
| parserOptions: { | |
| ecmaFeatures: { | |
| modules: true, | |
| jsx: true, | |
| }, | |
| }, | |
| }, | |
| }).run('eslint-v9', NextESLintRule, tests) | |
| }) | |