Method observe

ui/src/components/__tests__/setup.ts:24–38

()

      this.callback = callback;
    }
    observe() {
      // Immediately fire with a fake entry so react-window gets dimensions
      this.callback(
        [
          {
            contentRect: { width: 300, height: 600 } as DOMRectReadOnly,
            target: document.createElement('div'),
            borderBoxSize: [],
            contentBoxSize: [],
            devicePixelContentBoxSize: [],
          },
        ],
        this,
      );
    }
    unobserve() {}
    disconnect() {}
  };