Fixed reset of BABEL_ENV when options.forceEnv is used #420
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Please check if the PR fulfills these requirements
What kind of change does this PR introduce?
What is the current behavior? (You can also link to an open issue here)
After using 'forceEnv' option, BABEL_ENV is set to "undefined" (string), causing
unintended behaviour of babel running in different env.
What is the new behavior?
BABEL_ENV is correctly reset to previous value OR deleted if it wasn't set before
Does this PR introduce a breaking change?
Other
Some new serial tests added to test the environment variable clearing. Serial is needed
because otherwise, parallel execution interfere with setting/clearing of the variable.
Maybe these tests could be done with less config - feel free to change/update them :)