Handle the case where process.env does not exists (but process exists)

[gfx]

Alternative to #199

[codecov-commenter]

Codecov Report

Merging #200 (d81001c) into main (b041a96) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #200   +/-   ##
=======================================
  Coverage   98.13%   98.13%           
=======================================
  Files          16       16           
  Lines         964      964           
  Branches      206      206           
=======================================
  Hits          946      946           
  Misses         18       18           

Impacted Files	Coverage Δ
src/utils/utf8.ts	95.14% <100.00%> (ø)

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