fix(jest-haste-map): Fix slowdown on node versions > 10 (second attempt)

[vovkasm]

This is second attempt (first was #8803 and was incorrect, I definitely should run tests)
Fixes facebook/metro#429 for example.

Yes here is #8787, but I will try anyway. This time I split commits to small chunks. I prefer to eliminate any async/await syntax from file not only because it triggers some strange bugs in v8, but mostly because this syntax is ugly and leads to hard-to-understand code while promise based api is more clean (from my point of view).

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@53e964c). Click here to learn what that means.
The diff coverage is 79.16%.

@@            Coverage Diff            @@
##             master    #8806   +/-   ##
=========================================
  Coverage          ?   62.32%           
=========================================
  Files             ?      266           
  Lines             ?    10730           
  Branches          ?     2614           
=========================================
  Hits              ?     6687           
  Misses            ?     3460           
  Partials          ?      583

Impacted Files	Coverage Δ
packages/jest-haste-map/src/index.ts	81.39% <79.16%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 53e964c...b3e672e. Read the comment docs.

[SimenB]

Huh, interesting that this seems to fix the OOM we get with circus...

Question - is the issue fixed by just keeping async-await and not transpiling it to generator functions? You can test by just setting our babel config to compile to version 8 and building.

https://github.com/facebook/jest/blob/fafaf893575000ca423dc77aa8aa44554cdb3f57/babel.config.js#L30

[vovkasm]

@SimenB Yes, at least for node 12.8.0 setting target to node: 8 in babel.config.js also fixes issue with metro.

[vovkasm]

I still think that code without async/await looks cleaner and more understandable.

[SimenB]

#8787 landed, thanks for the PR (and checking babel config)!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.