jestSetup.ts

// Copoed from js-draw:
// https://github.com/personalizedrefrigerator/js-draw/blob/main/testing/beforeEachFile.ts

// jsdom doesn't support HTMLCanvasElement#getContext — it logs an error
// to the console. Make it return null so we can handle a non-existent Canvas
// at runtime (e.g. use something else, if available).
HTMLCanvasElement.prototype.getContext = () => null;

// jsdom also doesn't support ResizeObserver. Mock it.
window.ResizeObserver ??= class {
	public constructor(_callback: ResizeObserverCallback) {}

	public disconnect() {}

	public observe() {}

	public unobserve() {}
};