import type { ComparableEventListenerLike, EventListenerLike } from "./types.js";
/** To flatten {@linkcode options}.
 * @see https://dom.spec.whatwg.org/#concept-flatten-options
 */
export declare function flatOptions(options?: boolean | EventListenerOptions): boolean;
export type NormalizedOptions = Pick<EventListenerLike, keyof AddEventListenerOptions>;
/** To flatten {@linkcode options} more.
 * @see https://dom.spec.whatwg.org/#event-flatten-more
 */
export declare function flatOptionsMore(options?: boolean | AddEventListenerOptions): NormalizedOptions;
/** Return default passive value.
 * @see https://dom.spec.whatwg.org/#default-passive-value
 */
export declare function defaultPassiveValue(type: string, target: EventTarget): boolean;
interface NodeLike {
    readonly ownerDocument: object | null;
}
/** Whether the {@linkcode input} is {@linkcode NodeLike} or not. */
export declare function isNodeLike(input: object): input is NodeLike;
/** Whether the {@linkcode input} is {@linkcode Window} or not.
 * This works universally.
 */
export declare function isWindow(input: unknown): input is Window;
/** {@linkcode listener} to Function.
 * if {@linkcode listener} is function, return it; otherwise return bound `handleEvent`.
 */
export declare function toHandler(listener: EventListenerOrEventListenerObject): EventListener;
/** Return {@linkcode listener} representation key. */
export declare function toKey(listener: ComparableEventListenerLike): object;
export {};