script to extract sources, from sourcesContent field in sourcemap

source-map-unpacker.js

'use strict';

var fs = require('fs');

var maps = [
  fs.readFileSync('./main.xxxx.js.map'),
  fs.readFileSync('./1.chunk.xxxx.js.map'),
  fs.readFileSync('./2.chunk.xxxx.js.map'),
  fs.readFileSync('./3.chunk.xxxx.js.map')
];


function mapping(name){
  if (/^webpack:\/\/\/\.\//.test(name)) {
    return 'unpacked/' + name.replace(/^webpack:\/\/\/\.\//, 'app/')
        .replace(/\.(\w+)\?[./]*/, '\.$1');
  }
  // add more cases here to map all mossible source paths
  return false;
}
maps.forEach(function (mainJSON) {
  var main = JSON.parse(mainJSON);

  main.sources.forEach(function (name, i) {
    var dstFile;
    if (dstFile = mapping(name)) {
      if (!fs.existsSync(dstFile)) {
        var dirs = dstFile.split('/');
        dirs.slice(0,-1).reduce(function (acc, di) {
          var dir = acc+di;
          if (!fs.existsSync(dir)) {
            fs.mkdirSync(dir);
          }
          return dir+'/';
        }, './');

        fs.writeFileSync(dstFile, main.sourcesContent[i]);
      }
    } else {
      console.log('Mapping missing for filename: '+name);
    }
  });
});