import type { Page } from '@revesuite/store';
import { Slot } from '@revesuite/store';
export declare class FrameResizeObserver {
    private _observer;
    /**
     * Observation will fire when observation starts if Element is being rendered, and Element’s size is not 0,0.
     * https://w3c.github.io/csswg-drafts/resize-observer/#resize-observer-interface
     *
     * So we need to cache observed element.
     */
    private _cachedElements;
    private _lastRects;
    slots: {
        resize: Slot<Map<string, DOMRectReadOnly>>;
    };
    constructor();
    private _onResize;
    resetListener(page: Page): void;
    dispose(): void;
}
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