import { PowerSyncLogger } from '@powersync/common';
import { WorkerService } from './SharedWorkerConnectionRequest.js';
export interface OpenWorkerOptions {
    service: WorkerService;
    databaseIdentifier: string;
    customWorker?: string | URL;
    shared: boolean;
    loggerForErrors: PowerSyncLogger;
}
export interface WorkerConnection {
    endpoint: MessagePort | Worker;
    worker: Worker | SharedWorker;
    close: () => void;
}
export declare function connectToWorker({ service, databaseIdentifier, customWorker, shared, loggerForErrors }: OpenWorkerOptions): WorkerConnection;
export declare function connectToExistingWorker(worker: Worker | SharedWorker, logger: PowerSyncLogger, service: WorkerService): WorkerConnection;
export declare function isSharedWorker(worker: Worker | SharedWorker): worker is SharedWorker;