23.2.0 to 23.3.0 10x slower

[asafigan]

💥 Regression Report

I upgraded jest from 23.2.0 to 23.5.0 and now my tests run 10x slower.
I am using typescript with ts-jest.
The only difference is the version of jest.

Last working version

Worked up to version: 23.2.0

Stopped working in version: 23.3.0

To Reproduce

Steps to reproduce the behavior:
clone https://github.com/asafigan/jest-upgrade-issue
yarn install
yarn test --watch
press a to run all tests
after they run press enter to re run tests
I get a time of 0.736s

yarn upgrade [email protected]
yarn test --watch
press a to run all tests
after they run press enter to re run tests
I now get a time of 7.681s

Feel free to use the docker-compose configuration provided in the repo.

Expected behavior

time to run tests should stay about the same.

Link to repl or repo (highly encouraged)

https://github.com/asafigan/jest-upgrade-issue

Run npx envinfo --preset jest

Paste the results here:

  System:
    OS: Linux 4.9 Debian GNU/Linux 8 (jessie) 8 (jessie)
    CPU: x64 Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
  Binaries:
    Node: 8.11.3 - /usr/local/bin/node
    Yarn: 1.6.0 - /usr/local/bin/yarn
    npm: 5.6.0 - /usr/local/bin/npm
  npmPackages:
    jest: ^23.2.0 => 23.2.0

[thymikee]

Interesting, would be great to determine exact commit.

[asafigan]

I don't know how to do that.

[thymikee]

There's instruction on how to link Jest in Contributing guide in the root of the project, setup watch for rebuilding and then one can use git bisect.

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