import { RuleTester as ESLintTesterV8 } from 'eslint-v8' import { RuleTester as ESLintTesterV9 } from 'eslint' import { rules } from '@next/eslint-plugin-next' const NextESLintRule = rules['no-styled-jsx-in-document'] const tests = { valid: [ { filename: 'pages/_document.js', code: `import Document, { Html, Head, Main, NextScript } from 'next/document' export class MyDocument extends Document { static async getInitialProps(ctx) { const initialProps = await Document.getInitialProps(ctx) return { ...initialProps } } render() { return (
) } }`, }, { filename: 'pages/_document.js', code: `import Document, { Html, Head, Main, NextScript } from 'next/document' export class MyDocument extends Document { static async getInitialProps(ctx) { const initialProps = await Document.getInitialProps(ctx) return { ...initialProps } } render() { return (
) } }`, }, { filename: 'pages/index.js', code: ` export default function Page() { return ( <>

Hello world

) } `, }, ], invalid: [ { filename: 'pages/_document.js', code: ` import Document, { Html, Head, Main, NextScript } from 'next/document' export class MyDocument extends Document { static async getInitialProps(ctx) { const initialProps = await Document.getInitialProps(ctx) return { ...initialProps } } render() { return (
) } }`, errors: [ { message: `\`styled-jsx\` should not be used in \`pages/_document.js\`. See: https://nextjs.org/docs/messages/no-styled-jsx-in-document`, }, ], }, ], } describe('no-styled-jsx-in-document', () => { 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) })