import { Storage } from "./storage.type";
import { DeepReadonly } from "./common.type";
type CreateStateProviderOptions<T> = {
    key: string;
    defaultState?: T;
};
type StateProviderOptions<T> = {
    storage: Storage<T>;
    defaultState?: T;
};
export declare class StateProvider<T extends object> {
    private _options;
    private _stateSubject;
    state$: import("rxjs").Observable<DeepReadonly<T>>;
    constructor(_options: StateProviderOptions<T>);
    get currentState(): DeepReadonly<T>;
    update(updateCallback: (prevState: DeepReadonly<T>) => DeepReadonly<T>): void;
    patch(patchCallback: ((prevState: DeepReadonly<T>) => DeepReadonly<Partial<T>>) | DeepReadonly<Partial<T>>): void;
}
export declare function createMemoryStateProvider<T extends object>(options: CreateStateProviderOptions<T>): StateProvider<T>;
export declare function createLocalStateProvider<T extends object>(options: CreateStateProviderOptions<T>): StateProvider<T>;
export declare function createSecureCookieProvider<T extends object>(options: CreateStateProviderOptions<T>): StateProvider<T>;
export {};