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Turns out
pem
's main export will install its own globalprocess.emit
source map handler, for who-the-muffin-knows-why. But in any case, (a) it shouldn't, but thankfully (b) it's at least possible to avoid it doing that. So this PR avoids the installation and adds a test to make sure it doesn't start happening again. FWIW I was a bit wary when I started usingpem
in the first place, and this experience makes me reluctant to leave it in, in the long term.See Dexus/pem#389 and jestjs/jest#15077 for more details. And thanks very much to @SimenB and @nwalters512 for their assistance.