58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
#!/usr/bin/env node
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const vlq = require('vlq');
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const fs = require('fs');
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const path = require('path');
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module.exports =
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function getMappings(bundlePath) {
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const sourceMap = JSON.parse(getFile(`${bundlePath}.map`));
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const sourcesContent = sourceMap.sourcesContent.map(file => file.split('\n'));
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const bundleLines = getFile(bundlePath).split('\n');
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let sourceLines = sourcesContent[0];
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let sourceFileIndex = 0;
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let sourceLineIndex = 0;
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let sourceColIndex = 0;
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return decodeLines(sourceMap).reduce((matchData, mapLine, genLineIndex) => {
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mapLine.forEach((segment, index) => {
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if (segment.length) {
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const [genColDiff, sourceFileDiff, sourceLineDiff, sourceColDiff] = segment;
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// if source file changes, grab new file from sourcesContent
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if (sourceFileDiff !== 0) {
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sourceFileIndex += sourceFileDiff;
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sourceLines = sourcesContent[sourceFileIndex];
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}
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const genText = bundleLines[genLineIndex].trim();
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const sourceText = sourceLines[sourceLineIndex + sourceLineDiff].trim();
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// only record mappings that are long enough to be meaningful
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if (index === 0 && genText.length > 15 && sourceText.length > 15) {
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matchData.push({
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genLineIndex,
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sourceLineIndex,
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sourceFile: sourceMap.sources[sourceFileIndex], genText, sourceText
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});
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}
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sourceLineIndex += sourceLineDiff;
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sourceColIndex += sourceColDiff;
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}
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});
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return matchData;
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}, []);
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}
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function getFile(filePath) {
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return fs.readFileSync(path.resolve(process.cwd(), filePath), 'UTF-8');
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}
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function decodeLines(sourceMap) {
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return sourceMap.mappings.split(';').map(
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line => { return line.split(',').map(seg => vlq.decode(seg)); });
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}
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