export declare class UnhandledRequestError extends Error {
    constructor();
}
export interface RequestEventPayload<TSource extends HTMLElement> {
    source: TSource;
    handle: (fetch: Window['fetch']) => Promise<void>;
}
export interface RequestSendInit<TSource extends HTMLElement> {
    source: TSource;
    init: Parameters<Window['fetch']>;
}
export interface RequestEventInit<TSource extends HTMLElement> extends RequestSendInit<TSource> {
    resolve: (response: Response) => void;
    reject: (error: Error) => void;
}
/** @deprecated – use `FetchEvent` instead. */
export declare class RequestEvent<TSource extends HTMLElement = HTMLElement> extends CustomEvent<RequestEventPayload<TSource>> {
    static emit<TSource extends HTMLElement>(params: RequestSendInit<TSource>): Promise<Response>;
    constructor({ source, resolve, reject, init }: RequestEventInit<TSource>);
}