type ExtractArgs<T extends object> = T[keyof T] extends (...args: infer A) => any ? A : any[];
type EventState<T extends object, Args extends unknown[] = ExtractArgs<T>> = T & {
    (key?: keyof T, fun?: T[keyof T]): EventState<T, Args>;
    (target?: Partial<T>): EventState<T, Args>;
};

interface ResizeState<El extends Element = Element> {
    observer: ResizeObserver | null;
    listener(): void;
    mount(el: El): void;
    clean(el: null): void;
    resize(self: ResizeState<El>): void;
    ref(target: El): void;
}
type ResizeArg<El extends Element = Element> = Partial<ResizeState<El>> | ResizeState<El>['resize'];

declare const resizeEvent: <El extends Element = Element>(state: ResizeState) => EventState<ResizeState<El>>;

export { type ResizeArg, type ResizeState, resizeEvent };