Do not support --watch inside non-version-controlled environments

[artiebits]

Issue #5049

[codecov-io]

Codecov Report

Merging #5060 into master will increase coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #5060      +/-   ##
==========================================
+ Coverage   60.74%   60.76%   +0.01%     
==========================================
  Files         198      198              
  Lines        6605     6603       -2     
  Branches        4        4              
==========================================
  Hits         4012     4012              
+ Misses       2593     2591       -2

Impacted Files	Coverage Δ
packages/jest-cli/src/run_jest.js	53.84% <0%> (+1.99%)	⬆️

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[SimenB]

Thanks! Can you update the changelog as well?

Also, please fill out the template

[drewcook]

Nice to see the more descriptive message updated.
What about those of us that use SVN? When will --watch be supported?

[SimenB]

PR (with tests) welcome! 🙂 Code is in here: https://github.com/facebook/jest/tree/master/packages/jest-changed-files

[github-actions]

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