refactor: use type-checked JS instead of TS for quickstart examples #2422

Job	Run time
Check coding style	12s
Tests (macos-latest, Node 18.x)	5m 31s
Check version consistency of packages	6s
eslint	1m 28s
Tests (macos-latest, Node 20.x)	6m 19s
Tests (ubuntu-latest, Node 18.x)	1m 59s
Tests (ubuntu-latest, Node 20.x)	1m 59s
Tests (windows-latest, Node 18.x)	6m 19s
Tests (windows-latest, Node 20.x)	5m 53s
	29m 46s

Provide feedback