hmr-test waits for compile signal (#73064)
- The waitFor function now supports a predicate. Unlike retry, waitFor
does not include a timeout. Use it only when the predicate is guaranteed
to evaluate to true before proceeding to the next test. If it runs
indefinitely, Jest enforces a 120-second timeout per test.
- The getCliOutputFromHere utility provides a convenient string getter
that captures CLI output in between.
