This test checks if the side effects for loading RxJs packages have changed using https://github.com/filipesilva/check-side-effects.
Running npm test:side-effects will check all ES modules listed in side-effects.json.
Running npm test:side-effects:update will update any changed side effects.
To add a new ES module to this test, add a new entry in side-effects.json.
Usually the ESM and FESM should have the same output, but retained objects that were renamed during the flattening step will leave behind a different name.