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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)
})
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