import type { Rect } from '../core/types';
/**
 * Checks if a rectangle is fully visible within the screen viewport, considering padding.
 *
 * @param rect - The rectangle object containing position (x, y) and dimensions (width, height)
 * @param padding - The padding distance from screen edges in pixels (default: 20)
 *
 * @returns An object containing:
 *   - `isVisible`: boolean indicating if the rectangle is fully visible within the padded viewport
 *   - `scrollY`: (optional) the Y-axis scroll position needed to center the rectangle on screen, only present when `isVisible` is false
 *
 * @remarks
 * The function considers a rectangle fully visible when its top edge is below the top padding
 * and its bottom edge is above the bottom padding. If not visible, it calculates the scroll
 * position needed to vertically center the rectangle on the screen.
 */
export declare function isRectVisible(rect: Rect, padding?: number): {
    isVisible: boolean;
    scrollY?: number;
};
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