NgDocFormPartialValue

type NgDocFormPartialValue =
  T extends FormArray<infer FA>
    ? Array<NgDocFormPartialValue<FA>>
    : T extends FormGroup<infer FG>
      ? Partial<{ [K in keyof FG]: NgDocFormPartialValue<FG[K]> }>
      : T extends FormControl<infer FC>
        ? FC
        : never;