refactor: clean up and reduced code size #6009

Job	Run time
Checking if it's valid for JSR	10s
Deno	13s
Bun	4s
Fastly Compute	1m 1s
AWS Lambda	1m 6s
Main	2m 1s
Lambda@Edge	1m 2s
Node.js v18.18.2	1m 4s
Node.js v20.x	59s
Type & Bundle size Check on Main	0s
Type & Bundle size Check on PR	1m 13s
workerd	1m 6s
Node.js v22.x	1m 8s
Coverage	8s
	11m 15s

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