Resolving dependency injection when the effect is return by a function

type CustomDriver = (x: number) => Effect.Effect<number, never, ExternalService>

type RegularDriver = (x: number) => Effect.Effect<number, never, never>

const transformCustomToRegular =
  (service: Layer.Layer<ExternalService, never, never>) => (custom: CustomDriver): RegularDriver => {
    //
    // what to do…
    //
    //
    //return (x: number) => Effect.succeed(x)
    return (null as unknown as RegularDriver)
  }