Mark dependencies as external and revert to outputting CJS only #829

Job	Run time
lint	19s
test (24)	23s
test (18)	20s
test (22)	26s
test (20)	21s
test-prettier-versions (3.6.1)	18s
test-prettier-versions (3.7.0)	16s
test-prettier-versions (3.6.0)	19s
test-prettier-versions (3.5.3)	18s
test-prettier-versions (3.7.1)	18s
test-prettier-versions (latest)	17s
test-prettier-versions (3.7.2)	19s
test-prettier-versions (3.7.3)	19s
test-prettier-versions (3.6.2)	18s
	4m 31s

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