/**
 * Deadline-based debounce timer.
 *
 * Instead of clearing and re-creating a setTimeout on every call
 * (expensive at high frequency, e.g. 60fps mousemove), this pushes out
 * a `debounceUntil` deadline. The single running timer callback checks
 * whether the deadline has been reached:
 *   - If not, it re-schedules itself for the remaining time.
 *   - If so, it executes the callback.
 *
 * This means at most one `setTimeout` is live at any time, and
 * high-frequency `schedule()` calls only update a numeric field.
 */
export declare class DebounceTimer {
    private timer?;
    private callback?;
    private debounceUntil;
    private defaultMs;
    constructor(defaultMs?: number);
    /**
     * Schedule (or postpone) the callback.
     * If a timer is already running, only the deadline is pushed out.
     */
    schedule(callback: () => void, ms?: number): void;
    /** Cancel any pending execution. */
    clear(): void;
    /** Whether a timer is currently scheduled. */
    get pending(): boolean;
    private onFired;
}
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