import { type Ref } from 'vue';
export declare const channel: {
    on(type: string, handler: (data: any) => void): void;
    off(type: string, handler?: (data: any) => void): void;
    emit(type: string, data: any): void;
};
export declare function sendMessage(message: {
    type: string;
    data?: any;
}): void;
export declare function useBuildChannel(iframe: Ref<HTMLIFrameElement | undefined>): void;