perf(compose): check if it is a instance only once

[EdamAme-x]

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 94.72%. Comparing base (3164326) to head (014a81f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3585   +/-   ##
=======================================
  Coverage   94.72%   94.72%           
=======================================
  Files         158      158           
  Lines        9553     9554    +1     
  Branches     2815     2818    +3     
=======================================
+ Hits         9049     9050    +1     
  Misses        504      504           

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[yusukebe]

LGTM!

[yusukebe]

@EdamAme-x

Nice.

I've tried to benchmark for instanceof with this script:

import { bench, group, run } from 'mitata'
import { Context } from '../../src/context'

const c = new Context(new Request('http://localhost'))

bench('noop', async () => {})

group(() => {
  bench('instaceof', async () => {
    c instanceof Context
  })
  bench('noop', async () => {})
})

run()

There is no difference in Bun, but there is a slight difference on Node.js:

-------------------------------------- -------------------------------
instaceof                54.87 ns/iter  54.20 ns █▅
                 (51.39 ns … 92.19 ns)  81.03 ns ██▃▂▂▄▂▁▁▁▁▁▁▁▂▂▁▁▁▁▁
noop                     47.66 ns/iter  48.45 ns ▅ █
                 (42.72 ns … 90.24 ns)  73.71 ns █▃█▅▄▃▃▃▁▁▁▁▁▂▁▂▁▁▁▁▁

Interesting. Let's merge this. Thanks!