Type Alias MiddlewareFunction<Params, RouteId, GuardReturn>

MiddlewareFunction: (
event: MiddlewareInput<Params, RouteId>,
) => MaybePromise<GuardReturn | void | undefined>

A middleware function can compute/return an object ("guard") merged into the final handler context.

Returning undefined is allowed (no changes).

Type Parameters

Params extends Partial<Record<string, string>> = Partial<Record<string, string>>
RouteId extends string | null = string | null
GuardReturn = any

Type Declaration

- (
  event: MiddlewareInput<Params, RouteId>,
  ): MaybePromise<GuardReturn | void | undefined>
- Parameters
  - event: MiddlewareInput<Params, RouteId>
  Returns MaybePromise<GuardReturn | void | undefined>