code: function logDuplicate(chunk) {
      log(logFlag,
        chalk.black.bgYellow('WARNING') + ' skipping ' +
        chalk.magenta(chunk.data.srcRelativePath) +
        ' as it would output to same path as ' +
        chalk.magenta(buffer[chunk.relative].data.srcRelativePath)
      );
    }
docs: log possible output overwrite to console
  @param  {object} chunk stream chunk object
  @return {undefined}