/**
 * @file dh-picture-client/utils
 * @desc 照片数字人端渲染
 * @author zhangyue49
 */
export declare class EventEmitter {
    private static instance;
    private events;
    private constructor();
    static getInstance(): EventEmitter;
    on(eventName: string, cb: Function): void;
    emit(eventName: string, ...args: any[]): void;
    off(eventName: string, cb: Function): void;
}
export declare function fetchData(url: string): Promise<ArrayBuffer>;
export declare const base64toArrayBuffer: (dataurl: string) => Uint8Array;
export declare const getUrlParams: (name: string) => string | null;
export declare const checkPlayUnMute: () => boolean | Promise<boolean>;
export declare function decryptAES(fileBuffer: ArrayBuffer): Promise<ArrayBufferLike>;
export declare function getWsHost(): string;