import { WritableToPort } from './writable_to_port.js';
import type { Messagable } from '../types/streams.js';
/**
 * Ensure the other thread is ready to start receiving data before resolving with a Writable stream.
 */
export declare function prepareWritableToPortStream<Target extends Messagable>(target: Target, metaData: Record<any, any>, timeoutMs?: number): Promise<WritableToPort<Target>>;