type Callback<T> = (e: T) => void;
type Vouch = {
    id: string;
    externalId?: string;
};
type Campaign = Vouch;
export type VouchCustomEvent = {
    vouch: Vouch;
    campaign: Campaign;
};
export type VouchMessage = {
    event: string;
    detail?: VouchCustomEvent;
};
/**
 *
 * @param {VouchMessage} message
 */
declare function dispatchMessage(message: VouchMessage): void;
/**
 *
 * @param {HTMLElement} el
 * @param {string} event
 * @param {Callback<CustomEvent<VouchCustomEvent>>} callback
 * @returns {Function} unbind function
 */
declare function bindEvent(el: HTMLElement, event: string, callback: Callback<CustomEvent<VouchCustomEvent>>): () => void;
/**
 *
 * @param {Window} el
 * @param {string} event
 * @param {Callback<MessageEvent<string>>} callback
 * @returns typeof bindEvent
 */
declare function bindMessage(el: Window, event: string, callback: Callback<MessageEvent<VouchMessage>>): ReturnType<typeof bindEvent>;
export { bindEvent, bindMessage, dispatchMessage };