fixup! refactor: remove unnecessary `new Promise` wrappers #789

Job	Run time
eslint	2m 5s
Check coding style	17s
Check version consistency of packages	11s
setup-and-test (ubuntu-latest, 18.x)	3m 0s
setup-and-test (ubuntu-latest, 20.x)	3m 19s
	8m 52s

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