code: function shiftLinesLeft(text) {
      // Determine type of linebreak
      let linebreak = determineLinebreaks(text);
      if (linebreak === "") return text;
  
      let lines = [];
      lines = text.split(linebreak);
  
      // Find amount to shift lines
      let commonPrefix = null;
  
      for (let i = 0; i < lines.length; i++) {
          if (!lines[i].length) continue;
  
          let whitespace = lines[i].match(/^\s*/);
          if (whitespace) whitespace = whitespace[0];
          else whitespace = "";
  
          if (commonPrefix === null || commonPrefix.startsWith(whitespace)) commonPrefix = whitespace;
      }
  
      // Shift lines and return result
      text = "";
      let shift = commonPrefix.length;
  
      for (let i = 0; i < lines.length; i++) {
          if (lines[i].length) {
              lines[i] = lines[i].slice(shift, lines[i].length);
          }
  
          text += lines[i] + linebreak;
      }
  
      return text;
  }
docs: This function takes a text string and shifts all lines to the left so that
  as most leading spaces are removed as possible. All lines are shifted by
  the same amount which is determined as the minimum amount of white space
  at the beginning of all lines.
  
  @param  {String} text Original text
  @return {String} Shifted text