static forRoot(): ModuleWithProviders; error Angular 10 code example

Example: node_modules/angularx-flatpickr/flatpickr.module.d.ts:6:64 - error TS2314: Generic type 'ModuleWithProviders' requires 1 type argument(s).

export declare class FlatpickrModule {
   static forRoot(userDefaults?: FlatpickrDefaultsInterface): ModuleWithProviders<unknown>;