chore(package): explicitly declare js module type

[Fdawgs]

Node 21.1.0 added a flag to detect module types, which will probably become default in the future. Declaring the type will cause Node to skip detection on startup/compile, reducing startup time.

Declaring the package type is also considered good practice according to https://nodejs.org/api/modules.html#enabling.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5e2d3d1) 100.00% compared to head (8b4f705) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #77   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines          309       309           
  Branches        72        72           
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  Hits           309       309           

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