fix: support extended configs.

[knightedcodemonkey]

• fixes Duel appears not to respect "extends" in tsconfig #56

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.26%. Comparing base (69475ab) to head (dba7b75).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   98.32%   98.26%   -0.06%     
==========================================
  Files           3        3              
  Lines         417      403      -14     
==========================================
- Hits          410      396      -14     
  Misses          7        7              

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