import { NativePreferenceBridgeContract } from './NativePreferenceBridgeContract';
export declare class WebNativePreferenceBridgeiOS implements NativePreferenceBridgeContract {
    operatingSystem: string;
    static keySeperator: 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;
    createKey(preferenceName: string, key: string): string;
}