import { type Ref, type RefCallback } from "react";
/**
 * @since 6.0.0
 */
export type ResizeObserverEntryCallback = (entry: ResizeObserverEntry) => void;
/** @internal */
type Unsubscribe = () => void;
/** @internal */
interface TargetSize {
    height: number;
    width: number;
    scrollHeight: number;
    scrollWidth: number;
}
/** @internal */
interface TargetSubscription {
    onUpdate: ResizeObserverEntryCallback;
    disableHeight: boolean;
    disableWidth: boolean;
    size?: TargetSize;
}
/** @internal */
interface SubscribeOptions {
    element: Element;
    onUpdate: ResizeObserverEntryCallback;
    disableHeight: boolean;
    disableWidth: boolean;
}
/**
 * @internal
 * @since 6.0.0 This was added to help with testing. The
 * `subscriptions` and `sharedObserver` used to be module-level variables but
 * moving to a class makes it easier to mock. Checkout the
 * `src/tests-utils/ResizeObserver.ts`
 */
export declare class ResizeObserverManager {
    frame: number;
    subscriptions: Map<Element, Set<TargetSubscription>>;
    /**
     * Why is there a single shared observer instead of multiple and a
     * "subscription" model?
     *
     * Note: Probably a bit of a premature optimization right now...
     *
     * @see https://github.com/WICG/resize-observer/issues/59
     * @internal
     */
    sharedObserver: ResizeObserver | undefined;
    constructor();
    subscribe: (options: SubscribeOptions) => Unsubscribe;
    handleResizeEntries: (entries: ResizeObserverEntry[]) => void;
}
/**
 * @internal
 * @since 6.0.0
 */
export declare const resizeObserverManager: ResizeObserverManager;
/**
 * @since 2.3.0
 * @since 6.0.0 Renamed from `UseResizeObserverOptions` and added
 * `onUpdate`/`disabled` options.
 */
export interface ResizeObserverHookOptions<E extends HTMLElement> {
    /**
     * An optional ref to merge with the ref returned by this hook.
     */
    ref?: Ref<E>;
    /**
     * **Must be wrapped in `useCallback` to prevent re-creating the
     * ResizeObserver each render.**
     *
     * This function will be called whenever the target element resizes.
     *
     * @see {@link useResizeObserver} for an example.
     */
    onUpdate: ResizeObserverEntryCallback;
    /**
     * Set this to `true` to prevent observing the element's size changes. This is
     * equivalent to not attaching the returned ref to any element.
     *
     * @defaultValue `false`
     */
    disabled?: boolean;
    /**
     * Set this to `true` if the {@link onUpdate} should not be fired for height
     * changes.
     *
     * @defaultValue `false`
     */
    disableHeight?: boolean;
    /**
     * Set this to `true` if the {@link onUpdate} should not be fired for width
     * changes.
     *
     * @defaultValue `false`
     */
    disableWidth?: boolean;
}
/**
 * The resize observer is used to track the size changes of a specific element.
 * For most cases you can use the {@link useElementSize} instead, but this hook
 * can be used for more complex behavior with the {@link ResizeObserverEntry}.
 *
 * @example Simple Example
 * ```tsx
 * import { useResizeObserver } from "@react-md/core/useResizeObserver";
 * import { useCallback, useState, type ReactElement } from "react";
 *
 * function Example(): ReactElement {
 *   const elementRef = useResizeObserver({
 *     onUpdate: useCallback((entry) => {
 *       const element = entry.target;
 *       const { height, width } = entry.contentRect;
 *       const { inlineSize, blockSize } = entry.borderBoxSize[0];
 *       // do something
 *     }, []),
 *   });
 *
 *   return <div ref={elementRef}>{...whatever...}</div>
 * }
 * ```
 *
 * @since 2.3.0
 * @since 6.0.0 The API was updated to match the `useIntersectionObserver`
 * implementation -- accepts only a single object parameter and returns a
 * {@link RefCallback} instead of `[nodeRef, refCallback]`
 */
export declare function useResizeObserver<E extends HTMLElement>(options: ResizeObserverHookOptions<E>): RefCallback<E>;
export {};