refactor: compare with undefined directly

[exoego]

It's a bit shorter and more concise (Hono repo uses it widely over typeof).

Performance-wise, no changes.

import { bench, run } from 'mitata'

const v = 'str'

bench('typeof ', () => {
  const s = typeof v === 'undefined'
})

bench('direct', () => {
  const s = v === undefined
})

await run()

runtime: node 22.4.0 (arm64-darwin)

benchmark              avg (min … max) p75   p99    (min … top 1%)
-------------------------------------- -------------------------------
typeof                   96.02 ps/iter 101.56 ps           █           !
                 (71.04 ps … 52.26 ns) 111.82 ps ▁▁▁▁▁▁▁▁▁▁█▁▁▁▁█▁▁▁▁▁
direct                   96.73 ps/iter 101.81 ps           █    ▂      !
                  (71.04 ps … 9.09 ns) 112.06 ps ▁▁▁▁▁▁▁▁▁▁█▁▁▁▁█▁▁▁▁▁

runtime: bun 1.1.33 (arm64-darwin)

benchmark              avg (min … max) p75   p99    (min … top 1%)
-------------------------------------- -------------------------------
typeof                   90.79 ps/iter 101.56 ps         █   ▂   ▂     !
                 (61.04 ps … 10.29 ns) 112.06 ps ▁▁▁▁▁▁▁▁█▁▁▁█▁▁▁█▁▁▁▁
direct                   90.38 ps/iter 101.56 ps           █         ▂ !
                  (61.04 ps … 7.02 ns) 101.81 ps ▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▇▁▁▁▁█

runtime: deno 2.0.4 (aarch64-apple-darwin)

benchmark              avg (min … max) p75   p99    (min … top 1%)
-------------------------------------- -------------------------------
typeof                   88.86 ps/iter  91.55 ps           ▂    █      !
                 (61.04 ps … 12.07 ns) 101.81 ps ▁▁▁▁▁▁▁▁▁▁█▁▁▁▁█▁▁▁▁▁
direct                   89.30 ps/iter  91.55 ps                █      !
                 (61.04 ps … 10.83 ns) 101.81 ps ▁▁▁▁▁▁▁▁▁▁█▁▁▁▁█▁▁▁▁▁

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 94.71%. Comparing base (4dd8b2b) to head (8c4fd2d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3602   +/-   ##
=======================================
  Coverage   94.71%   94.71%           
=======================================
  Files         158      158           
  Lines        9555     9555           
  Branches     2813     2798   -15     
=======================================
  Hits         9050     9050           
  Misses        505      505           

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[yusukebe]

LGTM!

[yusukebe]

@exoego Thanks!