40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
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'use strict';
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var SourceMapGenerator = require('source-map').SourceMapGenerator;
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var SourceMapConsumer = require('source-map').SourceMapConsumer;
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module.exports = function applySourceMap(file, sourceMap) {
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if (typeof sourceMap === 'string' || sourceMap instanceof String) {
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sourceMap = JSON.parse(sourceMap);
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}
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if (file.sourceMap && (typeof file.sourceMap === 'string' || file.sourceMap instanceof String)) {
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file.sourceMap = JSON.parse(file.sourceMap);
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}
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// check source map properties
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assertProperty(sourceMap, "file");
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assertProperty(sourceMap, "mappings");
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assertProperty(sourceMap, "sources");
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// fix paths if Windows style paths
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sourceMap.file = sourceMap.file.replace(/\\/g, '/');
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sourceMap.sources = sourceMap.sources.map(function(filePath) {
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return filePath.replace(/\\/g, '/');
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});
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if (file.sourceMap && file.sourceMap.mappings !== '') {
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var generator = SourceMapGenerator.fromSourceMap(new SourceMapConsumer(sourceMap));
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generator.applySourceMap(new SourceMapConsumer(file.sourceMap));
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file.sourceMap = JSON.parse(generator.toString());
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} else {
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file.sourceMap = sourceMap;
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}
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};
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function assertProperty(sourceMap, propertyName) {
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if (!sourceMap.hasOwnProperty(propertyName)) {
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var e = new Error('Source map to be applied is missing the \"' + propertyName + '\" property');
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throw e;
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}
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}
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