Fix optional function parameter

[fabien0102]

Why

Closed #47

[codecov-commenter]

Codecov Report

Merging #48 (02cf133) into main (e5e4961) will decrease coverage by 0.42%.
The diff coverage is 97.91%.

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   98.49%   98.06%   -0.43%     
==========================================
  Files           8       10       +2     
  Lines         332      414      +82     
  Branches      102      122      +20     
==========================================
+ Hits          327      406      +79     
- Misses          5        6       +1     
- Partials        0        2       +2     

Impacted Files	Coverage Δ
src/utils/resolveDefaultProperties.ts	95.23% <95.23%> (ø)
src/utils/resolveModules.ts	97.61% <97.61%> (ø)
src/core/generate.ts	100.00% <100.00%> (ø)
src/core/generateZodSchema.ts	97.41% <100.00%> (+0.21%)	⬆️
src/core/jsDocTags.ts	98.46% <100.00%> (-1.54%)	⬇️
src/core/validateGeneratedTypes.ts	97.43% <100.00%> (+0.06%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1e13bbb...02cf133. Read the comment docs.