/**
 * Resize Observer Registry & Callbacks
 *
 * Provides global registry for element sizes and optional callback subscriptions.
 */
export interface ElementSize {
    width: number;
    height: number;
}
export type ResizeCallback = (size: ElementSize) => void;
/**
 * Get current size for element by ID (sync query)
 *
 * @example
 * const size = getSize('parent-container')
 * if (size) console.log(`Width: ${size.width}px`)
 */
export declare function getSize(id: string): ElementSize | undefined;
/**
 * Subscribe to size changes for element by ID
 * Returns unsubscribe function
 *
 * @example
 * const unsubscribe = onResize('parent', ({ width, height }) => {
 *   console.log(`Resized to ${width}x${height}`)
 * })
 * // Later: unsubscribe()
 */
export declare function onResize(id: string, callback: ResizeCallback): () => void;
/**
 * Get all registered sizes (for debugging/window API)
 */
export declare function getAllSizes(): Record<string, ElementSize>;
/**
 * Internal: Update size in registry and notify callbacks
 */
export declare function updateSize(id: string, width: number, height: number): void;
/**
 * Internal: Remove size from registry and cleanup callbacks
 */
export declare function removeSize(id: string): void;
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