[Feature]: support NODE_DEBUG

[ghost]

🚀 Feature Proposal

As there are many issues popping up about test execution slowness and other issues, it would be really helpful if one could get a look at how Jest itself performs and what it actually does.

Motivation

1. It will allow users to check whether Jest itself is slow, some of their test code is slow or a dependency that they are using causing slowness or at least help pointing at something more specific to investigate.
2. The output would provide Jest developers with hints about where to look at for troubleshooting.

Example

NODE_DEBUG=jest:* jest ...

Pitch

Only the core knows about what is executed internally and when.

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This issue was closed because it has been stalled for 30 days with no activity. Please open a new issue if the issue is still relevant, linking to this one.

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This issue was closed because it has been stalled for 30 days with no activity. Please open a new issue if the issue is still relevant, linking to this one.

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