admin-frontend-domain/src/test/setup.ts

class TestWorker implements Worker {
    onmessage: ((this: Worker, ev: MessageEvent) => unknown) | null = null
    onmessageerror: ((this: Worker, ev: MessageEvent) => unknown) | null = null
    onerror: ((this: AbstractWorker, ev: ErrorEvent) => unknown) | null = null

    addEventListener(): void {}
    removeEventListener(): void {}
    dispatchEvent(): boolean {
        return true
    }
    postMessage(): void {}
    terminate(): void {}
}

class TestResizeObserver implements ResizeObserver {
    observe(): void {}
    unobserve(): void {}
    disconnect(): void {}
}

class TestIntersectionObserver implements IntersectionObserver {
    readonly root: Element | Document | null = null
    readonly rootMargin = ""
    readonly thresholds: ReadonlyArray<number> = []

    observe(): void {}
    unobserve(): void {}
    disconnect(): void {}
    takeRecords(): IntersectionObserverEntry[] {
        return []
    }
}

globalThis.Worker = TestWorker
globalThis.ResizeObserver = TestResizeObserver
globalThis.IntersectionObserver = TestIntersectionObserver