Fix types

[drwpow]

Fix #519. Improve how types are shipped in the npm package.

[codecov]

Codecov Report

Merging #520 (ac64b06) into main (a46bde2) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #520      +/-   ##
==========================================
+ Coverage   84.82%   84.87%   +0.04%     
==========================================
  Files           9        9              
  Lines         323      324       +1     
  Branches      105      105              
==========================================
+ Hits          274      275       +1     
  Misses         46       46              
  Partials        3        3              

Impacted Files	Coverage Δ
src/transform/headers.ts	30.00% <ø> (ø)
src/transform/index.ts	56.60% <ø> (ø)
src/transform/operation.ts	96.42% <ø> (ø)
src/transform/paths.ts	91.66% <ø> (ø)
src/transform/responses.ts	86.84% <ø> (ø)
src/utils.ts	90.56% <ø> (ø)
src/index.ts	76.47% <100.00%> (+1.47%)	⬆️
src/transform/parameters.ts	97.43% <100.00%> (ø)

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