Function optionalCb

index.ts:6–10

(err: unknown, data: unknown, cb?: Callback)

type Callback = (_err?: unknown, _data?: any) => any

function optionalCb(err: unknown, data: unknown, cb?: Callback) {
  if (cb) return cb(err, data)
  if (err) throw err
  return data
}

interface Serializer {
  parse(s: string): SessionData | Promise<SessionData>