import type { Callback } from "./callback.js";
/**
 * Create a new Timeout.
 *
 * Wrapper for `setTimeout()` that...
 * - Keeps track of the reference returned from `setTimeout()`
 * - Clears the any existing timeout when a new timeout is set.
 * - Allows a default delay to be set that is applied to all new timeouts that don't have a delay set.
 *
 * @param ms The default delay for any created timeouts (in ms).
 */
export declare class Timeout {
    private _callback;
    private _ms;
    private _timeout;
    constructor(callback?: Callback | undefined, ms?: number);
    /** Is a timeout currently set? */
    get exists(): boolean;
    /**
     * Cancel any existing timeout and set a new one.
     * @param callback
     * @param ms The delay for this timeout (in ms).
     */
    set(callback?: Callback | undefined, ms?: number): void;
    /** Cancel any existing timeout.. */
    clear(): void;
}