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Andrew Clark 996da67b29 Replace global jest heuristic with IS_REACT_ACT_ENVIRONMENT (#22562 )

* Remove `jest` global check in concurrent roots

In concurrent mode, instead of checking `jest`, we check the new
`IS_REACT_ACT_ENVIRONMENT` global. The default behavior is `false`.

Legacy mode behavior is unchanged.

React's own internal test suite use a custom version of `act` that works
by mocking the Scheduler — rather than the "real" act used publicly. So
we don't enable the flag in our repo.

* Warn if `act` is called in wrong environment

Adds a warning if `act` is called but `IS_REACT_ACT_ENVIRONMENT` is not
enabled. The goal is to prompt users to correctly configure their
testing environment, so that if they forget to use `act` in a different
test, we can detect and warn about.

It's expected that the environment flag will be configured by the
testing framework. For example, a Jest plugin. We will link to the
relevant documentation page, once it exists.

The warning only fires in concurrent mode. Legacy roots will keep the
existing behavior.

2021-10-18 08:59:18 -07:00

src

Replace global jest heuristic with IS_REACT_ACT_ENVIRONMENT (#22562 )

2021-10-18 08:59:18 -07:00

package.json

React DevTools 4.19.2 -> 4.20.2 (#22569 )

2021-10-15 12:50:17 -04:00

README.md

[DRAFT] Import scheduling profiler into DevTools Profiler (#21897 )

2021-07-22 13:58:57 -04:00

README.md

React Concurrent Mode Profiler

This package contains the new/experimental "scheduling profiler" for React 18. This profiler exists as its own project because it was initially deployed as a standalone app. It has since been moved into the DevTools Profiler under the "Scheduling" tab. This package will likely eventually be moved into react-devtools-shared.