vitest.setup.ts

// jsdom does not implement ResizeObserver, but the core DimensionManager
// constructs one when the table mounts and relies on its *initial* callback to
// read the container width and trigger the first render.
class ResizeObserverStub {
  private callback: ResizeObserverCallback;
  constructor(callback: ResizeObserverCallback) {
    this.callback = callback;
  }
  observe(): void {
    queueMicrotask(() => this.callback([], this as unknown as ResizeObserver));
  }
  unobserve(): void {}
  disconnect(): void {}
}

globalThis.ResizeObserver = ResizeObserverStub as unknown as typeof ResizeObserver;

if (typeof globalThis.requestAnimationFrame !== "function") {
  globalThis.requestAnimationFrame = ((cb: FrameRequestCallback) =>
    setTimeout(() => cb(performance.now()), 0) as unknown as number) as typeof requestAnimationFrame;
  globalThis.cancelAnimationFrame = ((id: number) =>
    clearTimeout(id as unknown as ReturnType<typeof setTimeout>)) as typeof cancelAnimationFrame;
}

Object.defineProperty(HTMLElement.prototype, "clientWidth", {
  configurable: true,
  get() {
    return 800;
  },
});

// Keep this file a module so `ResizeObserverStub` is not a global across packages.
export {};