import { type PrimitiveProjection } from '@dxos/util';
export type CleanupFn = () => void;
/**
 * Combine multiple cleanup functions into a single cleanup function.
 * Can be used in effect hooks in conjunction with `addEventListener`.
 */
export declare const combine: (...cleanupFns: (boolean | undefined | CleanupFn | CleanupFn[])[]) => CleanupFn;
export declare const timeout: (cb: Function, ms?: number) => CleanupFn;
export declare const interval: (cb: Function, ms: number) => CleanupFn;
type EventMap<T> = T extends Window ? WindowEventMap : T extends Document ? DocumentEventMap : T extends HTMLElement ? HTMLElementEventMap : Record<string, Event>;
/**
 * Add the event listener and return a cleanup function.
 * Can be used in effect hooks in conjunction with `combine`.
 */
export declare const addEventListener: <T extends EventTarget, K extends keyof EventMap<T>>(target: T, type: K, listener: (this: T, ev: EventMap<T>[K]) => any, options?: boolean | AddEventListenerOptions) => CleanupFn;
export declare class SubscriptionList {
    private readonly _cleanups;
    add(...cb: CleanupFn[]): this;
    clear(): void;
}
export declare class SubscriptionSet<T = any> {
    private readonly _cleanupMap;
    constructor(keyProjection: PrimitiveProjection<T>);
    set(key: T, cb: CleanupFn): this;
    clear(): void;
}
export {};
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