import { BehaviorSubject } from 'rxjs';
/**
 * A BehaviorSubject backed by localStorage.
 */
export declare class LocalStorage<T extends LocalStorage.Serializable> extends BehaviorSubject<T> {
    private readonly key;
    constructor(key: string, defaultValue: T);
    next(value: T): void;
}
export declare namespace LocalStorage {
    type Serializable = string | number | boolean | null | {
        [property: string]: Serializable;
    } | Serializable[];
}