index.d.ts

interface DOMRectReadOnly {
    readonly x: number;
    readonly y: number;
    readonly width: number;
    readonly height: number;
    readonly top: number;
    readonly right: number;
    readonly bottom: number;
    readonly left: number;
}

declare global {
    interface ResizeObserverCallback {
        (entries: ResizeObserverEntry[], observer: ResizeObserver): void
    }

    interface ResizeObserverEntry {
        readonly target: Element;
        readonly contentRect: DOMRectReadOnly;
    }

    interface ResizeObserver {
        observe(target: Element): void;
        unobserve(target: Element): void;
        disconnect(): void;
    }
}

declare var ResizeObserver: {
    prototype: ResizeObserver;
    new(callback: ResizeObserverCallback): ResizeObserver;
}

interface ResizeObserver {
    observe(target: Element): void;
    unobserve(target: Element): void;
    disconnect(): void;
}

export default ResizeObserver;