import { ChildProcess } from 'child_process';
export declare class WorkerFacade {
    private logger;
    private pendingMessages;
    private subscriptions;
    private child;
    private exited;
    private filePath;
    private shutdownCallback;
    private resolveStartup;
    private startupPromise;
    private functionReportChannel;
    constructor(filePath: string, loggerNamespace?: string);
    getChildProcess(): ChildProcess;
    init(args: any): Promise<void>;
    dispose(): Promise<void>;
    subscribeToWorkerShutdown(callback: (exitCode: number, signal: string) => void): void;
    callFunction(topic: string, ...args: Array<any>): Promise<any>;
    publishEventNotification(topic: string, payload: any): Promise<any>;
    subscribe(topic: string, callback: (...args: any) => any, subscribeOnce?: boolean, ...args: any): Promise<string>;
    unsubscribe(id: string): void;
    private gracefullyShutdownWorker;
    private sendFunctionCancellation;
    private sendMessage;
    private serializeAndSend;
    private initChild;
    private receiveMessage;
    private handleFunctionResponseMessage;
    private handleSubscriptionResponseMessage;
    private handleSubscriptionEventMessage;
    private handleStartupFinishedMessage;
    private handleSystemMessage;
    private handleMetricsMessage;
    private handleWorkerExit;
    private handleWorkerError;
    private handleWorkerMessageError;
}