type Callback = () => void;
/**
 * onElementVisibilityChange callback called whenever the target element change the visibility.
 *
 * @ignore
 * @param isVisible true if the target element is visible and false otherwise.
 */
type VisibilityCallback = (isVisible?: boolean) => void;
interface VisibilityObserverOptions {
    /**
     * Sets a debounce threshold for the callback. Defaults to 100 milliseconds.
     */
    threshold?: number;
    /**
     * Offset fraction. Percentage of the element that needs to be hidden to be considered not visible.
     * Defaults to 0.4
     */
    viewabilityOffset?: number;
}
/**
 * Helper function to know if the visibility of an element has changed.
 *
 * @ignore
 *
 * @param target The element that we want to observe.
 * @param callback The callback that handles the visibility change.
 * @param options Options Map.
 *
 * @returns Unsubscribe function.
 */
export declare const onElementVisibilityChange: (target: HTMLElement, callback: VisibilityCallback, { threshold, viewabilityOffset }?: VisibilityObserverOptions) => Callback;
export {};