export declare enum AsyncOrSync {
    ASYNC = 0,
    SYNC = 1
}
export declare class ServiceWorkerUtils {
    readonly browsingContextId: string;
    readonly shellId: string;
    constructor(baseUrl: string, browsingContextId: string, shellId: string);
    getStdin(timeoutMs: number): string;
    getStdinAsync(timeoutMs: number, test?: boolean): Promise<string>;
    private _prepareStdinRequest;
    private _processStdinReply;
    private _url;
}