1234567891011121314151617181920212223
/** parse port number */export function parsePortNumber(v: string): number {  const num = parseInt(v)  if (isNaN(num) || !Number.isInteger(num) || num <= 0 || num >= 1 << 16) {    throw new Error(`invalid port '${v}'`)  }  return num}
/** get flag value by given keys. */export function getFlag(flags: Record<string, any>, keys: string[]): string | undefinedexport function getFlag(flags: Record<string, any>, keys: string[], defaultValue: string): stringexport function getFlag(flags: Record<string, any>, keys: string[], defaultValue?: string): string | undefined {  let value = defaultValue  for (const key of keys) {    if (key in flags) {      value = String(flags[key])      break    }  }  return value}