export function getArguments(fn: any): string[] {
  const strFn = fn.toString()
    .replace(/^async /i, '');
  const fnHeader = strFn.match(/^[a-z0-9_]+(?:\s|)\((.*?)\)/gi);

  if (fnHeader && fnHeader[0]) {
    if (fnHeader[0].indexOf('=') !== -1) {
      throw new Error(`Default values are not supported (fn: ${strFn})`);
    }
    return fnHeader[0].replace(/^[a-z0-9_]+(?:\s|)\(/gi, '')
      .replace(/\)/g, '')
      .split(', ').filter((v: string) => !!v);
  }

  return [];
}