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inline-critical-css_spec.ts
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inline-critical-css_spec.ts
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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { tags } from '@angular-devkit/core';
import { InlineCriticalCssProcessor } from './inline-critical-css';
describe('InlineCriticalCssProcessor', () => {
const styles: Record<string, string> = {
'/dist/styles.css': `
body { margin: 0; }
html { color: white; }
`,
'/dist/theme.css': `
span { color: blue; }
p { color: blue; }
`,
};
const readAsset = async (file: string): Promise<string> => {
const content = styles[file];
if (content) {
return content;
}
throw new Error('Cannot read asset.');
};
const getContent = (deployUrl: string, bodyContent = ''): string => {
return `
<html>
<head>
<link href="${deployUrl}styles.css" rel="stylesheet">
<link href="${deployUrl}theme.css" rel="stylesheet">
</head>
<body>${bodyContent}</body>
</html>`;
};
it('should inline critical css', async () => {
const inlineFontsProcessor = new InlineCriticalCssProcessor({
readAsset,
});
const { content } = await inlineFontsProcessor.process(getContent(''), {
outputPath: '/dist/',
});
expect(content).toContain(
`<link href="styles.css" rel="stylesheet" media="print" onload="this.media='all'">`,
);
expect(content).toContain(
`<link href="theme.css" rel="stylesheet" media="print" onload="this.media='all'">`,
);
expect(content).not.toContain('color: blue');
expect(tags.stripIndents`${content}`).toContain(tags.stripIndents`
<style>
body { margin: 0; }
html { color: white; }
</style>`);
});
it('should inline critical css when using deployUrl', async () => {
const inlineFontsProcessor = new InlineCriticalCssProcessor({
readAsset,
deployUrl: 'http://cdn.com',
});
const { content } = await inlineFontsProcessor.process(getContent('http://cdn.com/'), {
outputPath: '/dist/',
});
expect(content).toContain(
`<link href="http://cdn.com/styles.css" rel="stylesheet" media="print" onload="this.media='all'">`,
);
expect(content).toContain(
`<link href="http://cdn.com/theme.css" rel="stylesheet" media="print" onload="this.media='all'">`,
);
expect(tags.stripIndents`${content}`).toContain(tags.stripIndents`
<style>
body { margin: 0; }
html { color: white; }
</style>`);
});
it('should compress inline critical css when minify is enabled', async () => {
const inlineFontsProcessor = new InlineCriticalCssProcessor({
readAsset,
minify: true,
});
const { content } = await inlineFontsProcessor.process(getContent(''), {
outputPath: '/dist/',
});
expect(content).toContain(
`<link href="styles.css" rel="stylesheet" media="print" onload="this.media='all'">`,
);
expect(content).toContain(
`<link href="theme.css" rel="stylesheet" media="print" onload="this.media='all'">`,
);
expect(content).toContain('<style>body{margin:0}html{color:white}</style>');
});
it('should process the inline `onload` handlers if a CSP nonce is specified', async () => {
const inlineCssProcessor = new InlineCriticalCssProcessor({
readAsset,
});
const { content } = await inlineCssProcessor.process(
getContent('', '<app ngCspNonce="{% nonce %}"></app>'),
{
outputPath: '/dist/',
},
);
expect(content).toContain(
'<link href="styles.css" rel="stylesheet" media="print" ngCspMedia="all">',
);
expect(content).toContain(
'<link href="theme.css" rel="stylesheet" media="print" ngCspMedia="all">',
);
// Nonces shouldn't be added inside the `noscript` tags.
expect(content).toContain('<noscript><link rel="stylesheet" href="theme.css"></noscript>');
expect(content).toContain('<script nonce="{% nonce %}">');
expect(tags.stripIndents`${content}`).toContain(tags.stripIndents`
<style nonce="{% nonce %}">
body { margin: 0; }
html { color: white; }
</style>`);
});
it('should not modify the document for external stylesheets', async () => {
const inlineCssProcessor = new InlineCriticalCssProcessor({
readAsset,
});
const initialContent = `
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://google.com/styles.css" />
</head>
<body>
<app ngCspNonce="{% nonce %}"></app>
</body>
</html>
`;
const { content } = await inlineCssProcessor.process(initialContent, {
outputPath: '/dist/',
});
expect(tags.stripIndents`${content}`).toContain(tags.stripIndents`
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://google.com/styles.css">
</head>
`);
});
});