declare class MessagePortPolyfill implements MessagePort {
    onmessage: EventListener | null;
    onmessageerror: EventListener | null;
    otherPort: MessagePortPolyfill;
    private listeners;
    dispatchEvent(event: Event): boolean;
    postMessage(message: any): void;
    addEventListener(type: string, listener: EventListener): void;
    removeEventListener(type: string, listener: EventListener): void;
    start(): void;
    close(): void;
}
declare class MessageChannelPolyfill implements MessageChannel {
    readonly port1: MessagePortPolyfill;
    readonly port2: MessagePortPolyfill;
    constructor();
}
export { MessageChannelPolyfill as MessageChannel };
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