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Andrew Clark
b93f3e7d2d
Adds back the `TestUtils.act` implementation that I had removed in #19745. This version of `act` is implemented in "userspace" (i.e. not the reconciler), so it doesn't add to the production bundle size. I had removed this in #19745 in favor of the `act` exported by the reconciler because I thought we would remove support for `act` in production in the impending major release. (It currently warns.) However, we've since decided to continue supporting `act` in prod for now, so that it doesn't block people from upgrading to v17. We'll drop support in a future major release. So, to avoid bloating the production bundle size, we need to move the public version of `act` back to "userspace", like it was before. This doesn't negate the main goal of #19745, though, which was to decouple the public version(s) of `act` from the internal one that we use to test React itself.