Remove reliance on is-terminal

[jonhoo]

Cherry-picks #301

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.37%. Comparing base (a828b7e) to head (fa94bb4).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #336      +/-   ##
==========================================
- Coverage   91.38%   91.37%   -0.02%     
==========================================
  Files          20       20              
  Lines        4483     4440      -43     
==========================================
- Hits         4097     4057      -40     
+ Misses        386      383       -3     

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