in src/FileUpdater.js [184:194]
function updatePaths (pathMap, options, log) {
if (!pathMap || typeof pathMap !== 'object' || Array.isArray(pathMap)) {
throw new Error('An object mapping from target paths to source paths is required.');
}
// Iterate in sorted order for nicer logs
return Object.keys(pathMap).sort().map(targetPath => {
const sourcePath = pathMap[targetPath];
return updatePathInternal(sourcePath, targetPath, options, log);
}).some(updated => updated);
}