export declare class MessageChannel {
    private readonly appOrigin;
    private channel;
    private bufferedMessages;
    constructor({ appOrigin }: {
        appOrigin: string;
    });
    postMessage(message: any, transferables?: Transferable[]): void;
    setup({ onMessage }: {
        onMessage: (event: MessageEvent) => void;
    }): VoidFunction;
    dispatchBuffered(): void;
}
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