reverse-sourcemap/index.js

Reverse engineering JavaScript and CSS sources from sourcemaps

/**
 * reverse-sourcemap
 * https://github.com/davidkevork/reverse-sourcemap
 *
 * Reverse engineering JavaScript and CSS sources from sourcemaps
 *
 * Copyright (c) Juga Paazmaya <paazmaya@yahoo.com> (https://paazmaya.fi)
 * Copyright (c) David Kevork <david@davidkevork.me> (https://davidkevork.me)
 * Licensed under the MIT license
 */

'use strict';

const path = require('path');
const sourceMap = require('source-map');

/**
 * @param {string} input Contents of the sourcemap file
 * @param {object} options Object {verbose: boolean}
 *
 * @returns {object} Source contents mapped to file names
 */
module.exports = (input, options) => {

  const consumer = new sourceMap.SourceMapConsumer(input);

  return consumer.then((response) => {
    let map = {};
    if (response.hasContentsOfAllSources()) {
      if (options.verbose) {
        console.log('All sources were included in the sourcemap');
      }
  
      response.sources.forEach((source) => {
        const contents = response.sourceContentFor(source);
        map[path.normalize(source).replace(/^(\.\.[/\\])+/, '').replace(/[|\&#,+()?$~%'":*?<>{}]/g, '').replace(' ', '.')] = contents;
      });
    } else if (options.verbose) {
      console.log('Not all sources were included in the sourcemap');
    }
    return map;
  }).catch((e) => {
    console.log(e);
    return {};
  });
};