Understanding Requirements for RPC Middleware in Effect Typescript

export interface RpcMiddleware<Provides, E> {
  (options: {
    readonly rpc: Rpc.AnyWithProps
    readonly payload: unknown
    readonly headers: Headers
  }): Effect.Effect<Provides, E>
}

export interface RpcMiddleware<Provides, E> {
  (options: {
    readonly rpc: Rpc.AnyWithProps
    readonly payload: unknown
    readonly headers: Headers
  }): Effect.Effect<Provides, E>
}