Errors moving from jest to vitest

[IanGraingerGMSL]

Describe the bug A clear and concise description of what the bug is.

When trying to move from jest to vitest, (using just mockAllIsIntersecting(false);) I get an error:

TypeError: (cb, options = {}) => {
    var _a, _b, _c;
    const item = {
      callback: cb,
      elements: /* @__PURE__...<omitted>... } is not a constructor

I tried to add setupIntersectionMocking(vi.fn()); before mockAllIsIntersecting but then get TypeError: IntersectionObserver is not a constructor.

Versions:

• Version 9.13.1
• Vitest 4.0.17
• testing-library/react 16.3.0

[thebuilder]

You'll need to make a reproducible example before it's possible to assist. The problem is most likely in your configuration/setup.

[IanGraingerGMSL]

I made one and it was the version of react-intersection-observer. Moving to 10.0.2 fixed the problem! 🎉 🙏