import { MustardName } from '../typings';
export declare function proxyStorage(appName: MustardName, _storage: typeof localStorage | typeof sessionStorage): {
    readonly length: number;
    clear(): void;
    getItem(key: string): string;
    setItem(key: string, value: unknown): any;
    removeItem(key: string): boolean;
    key(index: number): string | symbol;
};
export declare function proxyLocalStorage(appName: MustardName): {
    readonly length: number;
    clear(): void;
    getItem(key: string): string;
    setItem(key: string, value: unknown): any;
    removeItem(key: string): boolean;
    key(index: number): string | symbol;
};
export declare function proxySessionStorage(appName: MustardName): {
    readonly length: number;
    clear(): void;
    getItem(key: string): string;
    setItem(key: string, value: unknown): any;
    removeItem(key: string): boolean;
    key(index: number): string | symbol;
};