export declare const ack: () => JetStreamSubscriberResponse

export declare const nak: (options?: NakOptions) => JetStreamSubscriberResponse

export declare const term: (options?: TermOptions) => JetStreamSubscriberResponse

export declare const isJetStreamSubscriberResponse: (u: unknown) => u is JetStreamSubscriberResponse

export interface Ack {
  readonly [TypeId]: TypeId
  readonly _tag: "Ack"
}

export type JetStreamSubscriberResponse = Ack | Nak | Term

export interface Nak {
  readonly [TypeId]: TypeId
  readonly _tag: "Nak"
  readonly millis?: number | undefined
}

export interface NakOptions {
  readonly millis?: number
}

export interface Term {
  readonly [TypeId]: TypeId
  readonly _tag: "Term"
  readonly reason?: string | undefined
}

export interface TermOptions {
  readonly reason?: string
}

export declare const TypeId: typeof TypeId

export type TypeId = typeof TypeId