| 1 |
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| 2 | import type {FileSystem} from '@parcel/fs';
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| 3 | import path from 'path';
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| 4 |
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| 5 | const SOURCEMAP_RE = /(?:\/\*|\/\/)\s*[@#]\s*sourceMappingURL\s*=\s*([^\r\n*]+)(?:\s*\*\/)?/;
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| 6 | const DATA_URL_RE = /^data:[^;]+(?:;charset=[^;]+)?;base64,(.*)/;
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| 7 |
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| 8 | export default async function loadSourceMapUrl(
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| 9 | fs: FileSystem,
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| 10 | filename: string,
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| 11 | contents: string
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| 12 | ) {
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| 13 | let match = contents.match(SOURCEMAP_RE);
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| 14 | if (match) {
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| 15 | let url = match[1].trim();
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| 16 | let dataURLMatch = url.match(DATA_URL_RE);
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| 17 | filename = dataURLMatch ? filename : path.join(path.dirname(filename), url);
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| 18 |
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| 19 | return {
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| 20 | url,
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| 21 | filename,
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| 22 | map: JSON.parse(
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| 23 | dataURLMatch
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| 24 | ? Buffer.from(dataURLMatch[1], 'base64').toString()
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| 25 | : await fs.readFile(filename, 'utf8')
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| 26 | )
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| 27 | };
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| 28 | }
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| 29 | }
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