Move to jlpm, align with jupyter-fs, move back to typescript

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 20.30075% with 106 lines in your changes missing coverage. Please review.

Project coverage is 67.06%. Comparing base (0aa6f01) to head (20df359).
Report is 7 commits behind head on main.

Files	Patch %	Lines
js/src/run.ts	9.09%	44 Missing and 6 partials ⚠️
js/src/widget.ts	11.11%	32 Missing ⚠️
js/src/tool.ts	25.00%	11 Missing and 1 partial ⚠️
js/src/activate.ts	26.66%	11 Missing ⚠️
js/src/utils.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #278       +/-   ##
===========================================
- Coverage   84.84%   67.06%   -17.78%     
===========================================
  Files          15       23        +8     
  Lines        1194     1579      +385     
  Branches      123      190       +67     
===========================================
+ Hits         1013     1059       +46     
- Misses        160      481      +321     
- Partials       21       39       +18     

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