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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-img-element']
const message =
'Using `<img>` could result in slower LCP and higher bandwidth. Consider using `<Image />` from `next/image` or a custom image loader to automatically optimize images. This may incur additional usage or cost from your provider. See: https://nextjs.org/docs/messages/no-img-element'
const tests = {
valid: [
`import { Image } from 'next/image';
export class MyComponent {
render() {
return (
<div>
<Image
src="/test.png"
alt="Test picture"
width={500}
height={500}
/>
</div>
);
}
}`,
`export class MyComponent {
render() {
return (
<picture>
<img
src="/test.png"
alt="Test picture"
width={500}
height={500}
/>
</picture>
);
}
}`,
`export class MyComponent {
render() {
return (
<div>
<picture>
<source media="(min-width:650px)" srcset="/test.jpg"/>
<img
src="/test.png"
alt="Test picture"
style="width:auto;"
/>
</picture>
</div>
);
}
}`,
{
code: `\
import { ImageResponse } from "next/og";
export default function icon() {
return new ImageResponse(
(
<img
alt="avatar"
style={{ borderRadius: "100%" }}
width="100%"
height="100%"
src="https://example.com/image.png"
/>
)
);
}
`,
filename: `src/app/icon.js`,
},
{
code: `\
import { ImageResponse } from "next/og";
export default function Image() {
return new ImageResponse(
(
<img
alt="avatar"
style={{ borderRadius: "100%" }}
width="100%"
height="100%"
src="https://example.com/image.png"
/>
)
);
}
`,
filename: `app/opengraph-image.tsx`,
},
],
invalid: [
{
code: `
export class MyComponent {
render() {
return (
<div>
<img
src="/test.png"
alt="Test picture"
width={500}
height={500}
/>
</div>
);
}
}`,
errors: [{ message, type: 'JSXOpeningElement' }],
},
{
code: `
export class MyComponent {
render() {
return (
<img
src="/test.png"
alt="Test picture"
width={500}
height={500}
/>
);
}
}`,
errors: [{ message, type: 'JSXOpeningElement' }],
},
{
code: `\
import { ImageResponse } from "next/og";
export default function Image() {
return new ImageResponse(
(
<img
alt="avatar"
style={{ borderRadius: "100%" }}
width="100%"
height="100%"
src="https://example.com/image.png"
/>
)
);
}
`,
filename: `some/non-metadata-route-image.tsx`,
errors: [{ message, type: 'JSXOpeningElement' }],
},
],
}
describe('no-img-element', () => {
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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