declare class FakeMessagePort {
    _otherPort: FakeMessagePort;
    _handlers: ((msg: {
        data: any;
    }) => void)[];
    _bypass: boolean;
    start(): void;
    close(): void;
    constructor();
    addEventListener(event: string, handler: (msg: {
        data: any;
    }) => void): void;
    removeEventListener(event: string, handler: (msg: {
        data: any;
    }) => void): void;
    postMessage(message: any, transfer: Transferable[]): void;
}
export declare class FakeMessageChannel {
    port1: FakeMessagePort;
    port2: FakeMessagePort;
    constructor();
}
export {};