import { MessageChannel } from './channel';
/** Wrap an existing port in a MessageChannel. Used on the server side
 *  (offscreen / SW) — there the port is already created by the onConnect
 *  listener. */
export declare function portToChannel(port: chrome.runtime.Port): MessageChannel;
/** Client-side channel factory: open a port to the extension runtime by name.
 *  The receiving side is the service worker (chrome.runtime.onConnect is there). */
export declare function createRuntimeChannel(portName: string): MessageChannel;
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