export declare class MessagePortEvent {
    event: unknown;
    dispatcherId: string;
    constructor(event: unknown, dispatcherId: string);
    toJSON(): {
        event: unknown;
        dispatcherId: string;
    };
}
export declare const isMessagePortEvent: (object: unknown) => object is {
    event: unknown;
    dispatcherId: string;
};
export declare const parseMessagePortEvent: (object: unknown) => MessagePortEvent | null;