code: function drawReport(results) {
      let files;
  
      files = results.map(result => {
          if (!result.messages.length) {
              return "";
          }
  
          return `\n${result.filePath}\n\n${drawTable(result.messages)}`;
      });
  
      files = files.filter(content => content.trim());
  
      return files.join("");
  }
docs: Draws a report (multiple tables).
  @param {Array} results Report results for every file.
  @returns {string} A column of text tables.