fix: types entrypoint

[weswigham]

For other entrypoints, an export map would probably be appropriate. The current structure causes issues like microsoft/TypeScript#47332 where TS users can't actually accurately check the package.

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Breaking Changes

Additional Info

[alexander-akait]

We should remove CJS wrapper (and use require/module.exports), we use babel and transform code to CommonJS, so real code in common js, but types generated for ESM (no options to set it because we use jsdocs with types)

[weswigham]

Hah, the generated types are accurate, despite the apparent esm syntax, there's no problem there; the package.json file just points to the wrong file, since main doesn't point at index.js.

[codecov]

Codecov Report

Merging #140 (5ec1dfa) into master (f4a09da) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #140   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          252       252           
  Branches        73        73           
=========================================
  Hits           252       252           

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