code: function prepend(file, text, options) {
    options = _.sanitize(options, {encoding: 'utf-8'});
    const encoding = options.encoding;
    if (!exists(file)) {
      write(file, text, {encoding: encoding});
    } else {
      const currentText = read(file, {encoding: encoding});
      write(file, text + currentText, {encoding: encoding});
    }
  }
docs: Add text at the beginning of a file
  @function $file~prepend
  @param {string} file - File to add text to
  @param {string} text - Text to add
  @param {Object} [options]
  @param {string} [options.encoding=utf-8] - Encoding used to read/write the file
  @example
  // Prepend new lines to 'Changelog' file
  $file.prepend('Changelog', 'Latest Changes:\n * Added new plugins\n');