Function warnOnMissingSetup

src/test-utils.ts:88–105

()

}

function warnOnMissingSetup() {
  if (isMocking()) return;
  console.error(
    `React Intersection Observer was not configured to handle mocking.
Outside Jest and Vitest, you might need to manually configure it by calling setupIntersectionMocking() and resetIntersectionMocking() in your test setup file.

// test-setup.js
import { resetIntersectionMocking, setupIntersectionMocking } from 'react-intersection-observer/test-utils';

beforeEach(() => {
  setupIntersectionMocking(vi.fn);
});

afterEach(() => {
  resetIntersectionMocking();
});`,
  );
}

/**
 * Create a custom IntersectionObserver mock, allowing us to intercept the `observe` and `unobserve` calls.