Fix a problem where masquerading as esm

[himanoa]

Related: #191

Fix a problem Masquerading as ESM.

Changed to use tsup to generate index.d.cts. Accordingly, Created a tsup config.

Operability confirmed

1. Exec yarn workspace @rimbu/core run build
2. Change directory to packages/core
3. Exec npm pack
4. Upload a generated tgz file to https://arethetypeswrong.github.io
5. Fixed masquerading as ESM problem

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you lint and formatted your code locally prior to submission?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[himanoa]

Once combined into a single bundle, the default export issue was also fixed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4e6bedc) 96.91% compared to head (017c6b1) 97.30%.
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   96.91%   97.30%   +0.38%     
==========================================
  Files         321      321              
  Lines       56319    57636    +1317     
  Branches     6587     6807     +220     
==========================================
+ Hits        54583    56083    +1500     
+ Misses       1724     1541     -183     
  Partials       12       12              

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[vitoke]

Impressive, nice work! So tsup is now used both for cjs and esm build right? Do you think this approach can be copied to all the other packages?

[vitoke]

Just to keep things clean, I think these json files can be removed too

[himanoa]

I'll fixed it.

[himanoa]

@vitoke

Impressive, nice work!

Thank you. ⭐

So tsup is now used both for cjs and esm build right? Do you think this approach can be copied to all the other packages?

Those two are correct. 👍
Only the core is a little different from the other packages. so I think to change it in another Pull-Request. Is that OK?

[vitoke]

Great improvement!