import { NativePreferenceBridgeContract } from './NativePreferenceBridgeContract';
export declare class WebNativePreferenceBridge implements NativePreferenceBridgeContract {
    operatingSystem: string;
    constructor(operatingSystem: string);
    getString(preferenceName: string, key: string, defaultValue?: string): Promise<string>;
    getNumber(preferenceName: string, key: string, defaultValue: number): Promise<number>;
    getDecryptedUserId(): Promise<string>;
    saveNumber(preferenceName: string, key: string, value: number): void;
    saveString(preferenceName: string, key: string, value: string): void;
    removeItem(preferenceName: string, key: string): void;
    prefObject(prefName: string, key: string, value?: string, defaultValue?: string): {
        [key: string]: string;
    };
}