refactor(router): use # for private props to reduce the minified bundle size

[EdamAme-x]

Related: #3596

Bundle Size

19.2kb => 18.7kb (1kb = 1024b)
0.5kb less

gitpod@honojs-hono-3kgrjey8wtg:/workspace/hono/sandbox$ ls . -l
total 40
-rw-r--r-- 1 gitpod gitpod 18767 Nov 12 04:19 after.js
-rw-r--r-- 1 gitpod gitpod 19211 Nov 12 04:05 before.js

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.69%. Comparing base (7e17b76) to head (c099418).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3660   +/-   ##
=======================================
  Coverage   91.69%   91.69%           
=======================================
  Files         159      159           
  Lines       10138    10140    +2     
  Branches     2976     2878   -98     
=======================================
+ Hits         9296     9298    +2     
  Misses        840      840           
  Partials        2        2           

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[yusukebe]

LGTM!

[yusukebe]

@EdamAme-x

Nice work! Thanks!

[EdamAme-x]

The bundle size is definitely smaller🎉 (1kb less from 4.6.8)

[yusukebe]

Super cool! Great job @EdamAme-x !