f3c69e7f6b
The `flatten` function used `concat` and `slice` which created a lot of intermediary object allocations. Because `flatten` is used from query any benchmark which used query would exhibit high minor GC counts. PR Close #30468
This test checks if the side effects for loading Angular packages have changed using https://github.com/filipesilva/check-side-effects.
Running yarn test will check all ES modules listed in side-effects.json.
Running yarn 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.