Allow detectOpenHandles in jest.config.js

[clarkdo]

Summary

Current if config detectOpenHandles in jest.config.js, validation warning will be thrown:

● Validation Warning: Unknown option "detectOpenHandles" with value true was found. This is probably a typing mistake. Fixing it will remove this message.

Resolve warning in https://github.com/nuxt/nuxt.js/pull/3581

[mattphillips]

LGTM! @clarkdo could you add an entry to the changelog?

[SimenB]

As mentioned in another issue (on mobile, so hard to dig up), detectOpenHandles was intentionally not added to config - the performance overhead is pretty bad (30+%). Once the performance overhead is gone (or reduced enough) we'll remove the flag as well and make the behavior the default

[clarkdo]

@mattphillips Done

[codecov-io]

Codecov Report

Merging #6747 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6747   +/-   ##
=======================================
  Coverage   63.44%   63.44%           
=======================================
  Files         235      235           
  Lines        9112     9112           
  Branches        4        4           
=======================================
  Hits         5781     5781           
  Misses       3330     3330           
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-config/src/valid_config.js	100% <ø> (ø)	:arrow_up:

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[TheAlexLichter]

The related comment that @SimenB mentioned: https://github.com/facebook/jest/pull/6130#issuecomment-386676404

[reuveniy]

Would love to see this goes in @clarkdo

[rickhanlonii]

@SimenB if we document the performance hit, would you be ok to add this to the config?

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