fixup! refactor: remove unnecessary `new Promise` wrappers #779

Job	Run time
setup-and-test (ubuntu-latest, 18.x)	2m 44s
Check coding style	13s
setup-and-test (ubuntu-latest, 20.x)	2m 22s
Check version consistency of packages	10s
eslint	1m 47s
	7m 16s

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