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