import { RuleTester as ESLintTesterV8 } from 'eslint-v8' import { RuleTester as ESLintTesterV9 } from 'eslint' import { rules } from '@next/eslint-plugin-next' const NextESLintRule = rules['no-sync-scripts'] const message = 'Synchronous scripts should not be used. See: https://nextjs.org/docs/messages/no-sync-scripts' const tests = { valid: [ `import {Head} from 'next/document'; export class Blah extends Head { render() { return (

Hello title

); } }`, `import {Head} from 'next/document'; export class Blah extends Head { render(props) { return (

Hello title

); } }`, ], invalid: [ { code: ` import {Head} from 'next/document'; export class Blah extends Head { render() { return (

Hello title

); } }`, errors: [{ message, type: 'JSXOpeningElement' }], }, { code: ` import {Head} from 'next/document'; export class Blah extends Head { render(props) { return (

Hello title

); } }`, errors: [{ message, type: 'JSXOpeningElement' }], }, ], } describe('no-sync-scripts', () => { 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) })