code: function warning(lines) {
    lines.unshift('');    // Extra whitespace at the start.
    lines.push('');       // Extra whitespace at the end.
  
    lines.forEach(function each(line) {
      console.error('asset-bundle:warning', line);
    });
  }
docs: Really stupid simple warning output.
  
  @param {Array} lines The messages that needs to be spammed.
  @private