Event

declare function make<
  Tag extends string,
  Payload extends Any = Void,
  Success extends Any = Void,
  Error extends All = Never,
>(options: {
  readonly error?: Error;
  readonly payload?: Payload;
  readonly primaryKey: (payload: Type<Payload>) => string;
  readonly success?: Success;
  readonly tag: Tag;
}): Event<Tag, Payload, Success, Error>;

declare function isEvent(u: unknown): u is Event<any, any, any, any>;

interface Event<
  out Tag extends string,
  in out Payload extends Schema.Schema.Any = typeof Schema.Void,
  in out Success extends Schema.Schema.Any = typeof Schema.Void,
  in out Error extends Schema.Schema.All = typeof Schema.Never,
> {
  readonly [TypeId]: typeof TypeId;
  readonly error: Error;
  readonly payload: Payload;
  readonly payloadMsgPack: schema<Payload>;
  readonly primaryKey: (payload: Type<Payload>) => string;
  readonly success: Success;
  readonly tag: Tag;
}

interface EventHandler<in out Tag extends string> {
  readonly _: typeof _;
  readonly tag: Tag;
}

declare const TypeId: unique symbol;

type TypeId = typeof TypeId;