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refactor(packages): drop no-op export, dedupe helpers #3770

Job	Run time
build	14s
test (2/4)	55s
test (1/4)	41s
test (3/4)	36s
static-analysis	50s
test (4/4)	46s
test (one-process pollution detector)	0s
typecheck	3s
eslint	4s
prettier	4s
test (src)	3s
build-and-test	3s
	4m 19s