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Pete Bacon Darwin
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We need to be clearer to developers who upgrade to v9 (next) and get this error, why they have a problem and what they have to do about it. Once we have a better CLI schematics story, where this import will be included by default in new applications and a CLI migration will add it when upgrading apps to v9, we could simplify or remove this error message. PR Close #32491
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.