fixup! refactor: remove unnecessary `new Promise` wrappers #785

Job	Run time
eslint	2m 34s
setup-and-test (ubuntu-latest, 18.x)	3m 41s
Check coding style	12s
setup-and-test (ubuntu-latest, 20.x)	3m 48s
Check version consistency of packages	11s
	10m 26s

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