Node.js CI

Generalize `Awaitable` type #481

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Run time

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Job	Run time
lint & ts-test	17s
test (Node.js 12)	14s
test (Node.js 18)	12s
test (Node.js 14)	19s
test (Node.js 20)	14s
test (Node.js 16)	12s
test (Node.js 22)	18s
test (Node.js 23)	13s
	1m 59s