* Remove obsolete recipes

ES modules is supported out of the box.

The React recipe applies to AVA 3.

* Remove code guards against obsolete API usage

* Remove references to older AVA versions from documentation

These tests are more likely to be flaky on Mac and Windows.

Always await the last pending state when the watch runs have completed.

Use a teardown hook to ensure the watcher is aborted and has exited before ending the test.

Ensure the item is always an object, even if it didn't come from the generator.

Otherwise, on Linux, it seems the abort signal is disregarded.

Don't emit the 'touched-files' event, since the watcher assumes that comes with a files value.

Fixes #3285

…test worker

It prints the error, so it should fail as such.

Register a function to be called when AVA has completed a test run without uncaught exceptions or unhandled rejections.

Fixes #3279.
 *
 * Completion handlers are invoked in order of registration. Results are not awaited.