import type ConfigEvaluation from './ConfigEvaluation';
import { IUserPersistentStorage, UserPersistedValues } from './interfaces/IUserPersistentStorage';
import type { StatsigUser } from './StatsigUser';
export default class UserPersistentStorageHandler {
    private storage;
    constructor(storage: IUserPersistentStorage | null);
    load(user: StatsigUser, idType: string): UserPersistedValues | null;
    save(user: StatsigUser, idType: string, configName: string, evaluation: ConfigEvaluation): void;
    delete(user: StatsigUser, idType: string, configName: string): void;
    private static getStorageKey;
}