fix: copyfiles JS API options argument should be optional, fixes #49

[ghiscoding]

fixes #49

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.40%. Comparing base (0d32bd4) to head (14407d2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   99.40%   99.40%           
=======================================
  Files           2        2           
  Lines         164      164           
  Branches       56       57    +1     
=======================================
  Hits          163      163           
  Misses          1        1           

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