code: function extractSourceMap(bundleContents) {
    var start = bundleContents.lastIndexOf('//# sourceMappingURL');
    var sourceMapComment = start !== -1 ? bundleContents.substring(start) : '';
  
    return sourceMapComment && convert.fromComment(sourceMapComment);
  }
docs: Extract the source map from the given bundle contents
  
  @param {String} source
  @return {SourceMap} if it could be parsed