Update `import/extensions` rules in `typescript` config

[OlivierZal]

[OlivierZal]

Related to https://github.com/import-js/eslint-plugin-import/issues/2853

Successfully tested end-to-end.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.96%. Comparing base (6b95a02) to head (b87b288). Report is 122 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2875      +/-   ##
==========================================
- Coverage   95.13%   94.96%   -0.17%     
==========================================
  Files          68       68              
  Lines        2959     2962       +3     
  Branches     1035     1035              
==========================================
- Hits         2815     2813       -2     
- Misses        144      149       +5     

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[ljharb]

@OlivierZal are you no longer interested in completing this PR?

[OlivierZal]

Hi @ljharb, you're right I should have explained why.

Actually I don't really remember why I needed it 😅 I think it was when I used the airbnb config in a .eslintrc json, but now I customize my config directly in JS.

However I don't think it's a good thing to do anymore since TypeScript 5.7 now allows to use .ts (and equivalent) extensions thanks to this tsconfig option.