/**
 * MessagePort-based provider.
 *
 * Implements the Provider interface over a `MessagePort`.  The port may
 * be available immediately or delivered as a Promise (e.g. when the
 * other side has not connected yet).  Messages sent before the port
 * resolves are queued and flushed once it is ready.
 */
import type { Provider } from "./provider.js";
/**
 * Create a Provider that communicates over a MessagePort.
 *
 * @param portOrPromise - A ready MessagePort or a Promise that resolves
 *   to one.  Messages sent before the promise resolves are delivered
 *   once the port becomes available.
 */
export declare function createMessagePortProvider(portOrPromise: MessagePort | Promise<MessagePort>): Provider;
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