fix: Add type check for process.env

[nandenjin]

Fixes #5789

This PR adds type checks for process.env to avoid TypeError when process.env is undefined although process is defined.

[changeset-bot]

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Latest commit: c3c85d8

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[nandenjin]

@schmidt-sebastian @jsdt 4 months passed, how is it going now?

[schmidt-sebastian]

Sorry I did not see this PR.