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jest-event-demo

nvm use 16 # at least 15.4+
npm install
npx jest

 FAIL  ./event.test.js
  ● Test suite failed to run

    ReferenceError: Event is not defined

      1 | // use it somehow
    > 2 | Event;
        | ^
      3 | // ReferenceError: Event is not defined

      at Object.<anonymous> (setupJest.js:2:1)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        0.126 s
Ran all test suites.

Or if you comment out or remove the setupJest.js you'll find the event.test.js tests fail because typeof Event and typeof EventTarget are both undefined.