import { TEnforceFeatureConstraint, TFeatureDefinition } from '@blgc/types/features';
import type { TPersistFeature, TState } from '../types';
export declare const FAILED_TO_LOAD_FROM_STORAGE_IDENTIFIER: null;
export declare const LOAD_FROM_STORAGE_SOURCE_KEY = "loadFromStorage";
export interface TStorageInterface<GStorageValue> {
    save: (key: string, value: GStorageValue) => Promise<boolean> | boolean;
    load: (key: string) => Promise<GStorageValue | typeof FAILED_TO_LOAD_FROM_STORAGE_IDENTIFIER> | GStorageValue | typeof FAILED_TO_LOAD_FROM_STORAGE_IDENTIFIER;
    delete: (key: string) => Promise<boolean> | boolean;
}
export declare function withStorage<GValue, GFeatures extends TFeatureDefinition[], GStorageValue extends GValue = GValue>(baseState: TEnforceFeatureConstraint<TState<GValue, GFeatures>, TState<GValue, GFeatures>, []>, storage: TStorageInterface<GStorageValue>, key: string): TState<GValue, [TPersistFeature, ...GFeatures]>;