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24 lines
1.2 KiB
TypeScript
24 lines
1.2 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import * as path from 'path';
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/**
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* Prepends a marker comment with the CSS module's repo-relative source path.
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*
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* Native CSS (`experiments.css`) concatenates every imported `.css` module into
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* a single stylesheet, but it preserves comments. This marker therefore lets
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* tooling that reads the bundled stylesheet (e.g. the cascade-order-dependency
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* detector and its bisection) map each concatenated "document" back to the
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* exact source file by name, instead of relying on the generic copyright
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* banner which carries no filename.
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*
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* `this.rootContext` is the rspack `context` option (the repo root), so no
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* `__dirname` handling is needed.
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*/
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export default function cssSourceMarkerLoader(this: { resourcePath: string; rootContext: string }, source: string): string {
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const rel = path.relative(this.rootContext, this.resourcePath).replace(/\\/g, '/');
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return `/* @css-source: ${rel} */\n${source}`;
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}
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