Reduce dependencies

[raymyers]

🚀 Feature Proposal

Reduce the number of dependencies including transitive to <100 .

Motivation

When you create a new project with Jest, there are immediately 347 dependencies pulled in. Many of these are included for just a few lines and consolidated packages with related groups of functionality could be used instead to make the dev workflow more efficient.

The shear quantity of tiny packages is beginning to be recognized as a liability, e.g.
https://www.zdnet.com/article/another-one-line-npm-package-breaks-the-javascript-ecosystem/

If you agree that this is a good goal, I'm willing to help work on it. I wanted to create this issue to gauge reaction before I started working on pull requests. If there are related efforts underway, please point me in the right direction.

Thanks!

[jeysal]

This is something @cpojer is somewhat passionate about and has recently landed some things to improve, not sure how much improvement that already brought and how many more quick wins we have available.
I'm not personally passionate about it (I'm more looking into the external things that are loaded once per test file which are a major performance bottleneck), but I would help land anything that makes a noticable improvement in install size as long as the added maintenance burden is low.

[jeysal]

This is a duplicate of #6266

[raymyers]

Thanks @jeysal. I'll check up on #6266 and direct any PRs there.

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