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Speed up test suite #3454

Job	Run time
static-analysis	47s
test (4/4)	1m 3s
test (1/4)	54s
test (2/4)	55s
build	15s
test (3/4)	45s
test (one-process pollution detector)	0s
prettier	4s
typecheck	4s
eslint	3s
test (src)	3s
build-and-test	3s
	4m 56s