import { NgbTimeStruct } from './ngb-time-struct';
export declare function NGB_DATEPICKER_TIME_ADAPTER_FACTORY(): NgbTimeStructAdapter;
/**
 * An abstract service that does the conversion between the internal timepicker `NgbTimeStruct` model and
 * any provided user time model `T`, ex. a string, a native date, etc.
 *
 * The adapter is used **only** for conversion when binding timepicker to a form control,
 * ex. `[(ngModel)]="userTimeModel"`. Here `userTimeModel` can be of any type.
 *
 * The default timepicker implementation assumes we use `NgbTimeStruct` as a user model.
 *
 * See the [custom time adapter demo](#/components/timepicker/examples#adapter) for an example.
 *
 * @since 2.2.0
 */
export declare abstract class NgbTimeAdapter<T> {
    /**
     * Converts a user-model time of type `T` to an `NgbTimeStruct` for internal use.
     */
    abstract fromModel(value: T | null): NgbTimeStruct | null;
    /**
     * Converts an internal `NgbTimeStruct` time to a user-model time of type `T`.
     */
    abstract toModel(time: NgbTimeStruct | null): T | null;
}
export declare class NgbTimeStructAdapter extends NgbTimeAdapter<NgbTimeStruct> {
    /**
     * Converts a NgbTimeStruct value into NgbTimeStruct value
     */
    fromModel(time: NgbTimeStruct | null): NgbTimeStruct | null;
    /**
     * Converts a NgbTimeStruct value into NgbTimeStruct value
     */
    toModel(time: NgbTimeStruct | null): NgbTimeStruct | null;
}