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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-unwanted-polyfillio']
const tests = {
valid: [
`import {Head} from 'next/document';
export class Blah extends Head {
render() {
return (
<div>
<h1>Hello title</h1>
<script src='https://polyfill.io/v3/polyfill.min.js?features=AbortController'></script>
</div>
);
}
}`,
`import {Head} from 'next/document';
export class Blah extends Head {
render() {
return (
<div>
<h1>Hello title</h1>
<script src='https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver'></script>
</div>
);
}
}`,
`import Script from 'next/script';
export function MyApp({ Component, pageProps }) {
return (
<div>
<Component {...pageProps} />
<Script src='https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver' />
</div>
);
}`,
`import Script from 'next/script';
export function MyApp({ Component, pageProps }) {
return (
<div>
<Component {...pageProps} />
<Script src='https://polyfill-fastly.io/v3/polyfill.min.js?features=IntersectionObserver' />
</div>
);
}`,
],
invalid: [
{
code: `import {Head} from 'next/document';
export class Blah extends Head {
render() {
return (
<div>
<h1>Hello title</h1>
<script src='https://polyfill.io/v3/polyfill.min.js?features=WeakSet%2CPromise%2CPromise.prototype.finally%2Ces2015%2Ces5%2Ces6'></script>
</div>
);
}
}`,
errors: [
{
message:
'No duplicate polyfills from Polyfill.io are allowed. WeakSet, Promise, Promise.prototype.finally, es2015, es5, es6 are already shipped with Next.js. See: https://nextjs.org/docs/messages/no-unwanted-polyfillio',
type: 'JSXOpeningElement',
},
],
},
{
code: `
export class Blah {
render() {
return (
<div>
<h1>Hello title</h1>
<script src='https://polyfill.io/v3/polyfill.min.js?features=Array.prototype.copyWithin'></script>
</div>
);
}
}`,
errors: [
{
message:
'No duplicate polyfills from Polyfill.io are allowed. Array.prototype.copyWithin is already shipped with Next.js. See: https://nextjs.org/docs/messages/no-unwanted-polyfillio',
type: 'JSXOpeningElement',
},
],
},
{
code: `import NextScript from 'next/script';
export function MyApp({ Component, pageProps }) {
return (
<div>
<Component {...pageProps} />
<NextScript src='https://polyfill.io/v3/polyfill.min.js?features=Array.prototype.copyWithin' />
</div>
);
}`,
errors: [
{
message:
'No duplicate polyfills from Polyfill.io are allowed. Array.prototype.copyWithin is already shipped with Next.js. See: https://nextjs.org/docs/messages/no-unwanted-polyfillio',
type: 'JSXOpeningElement',
},
],
},
{
code: `import {Head} from 'next/document';
export class ES2019Features extends Head {
render() {
return (
<div>
<h1>Hello title</h1>
<script src='https://polyfill.io/v3/polyfill.min.js?features=Object.fromEntries'></script>
</div>
);
}
}`,
errors: [
{
message:
'No duplicate polyfills from Polyfill.io are allowed. Object.fromEntries is already shipped with Next.js. See: https://nextjs.org/docs/messages/no-unwanted-polyfillio',
},
],
},
],
}
describe('no-unwanted-polyfillio', () => {
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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