Mark dependencies as external and revert to outputting CJS only #833

Job	Run time
lint	32s
test (22)	31s
test (24)	28s
test (18)	32s
test-prettier-versions (3.7.0)	21s
test (20)	30s
test-prettier-versions (3.6.2)	24s
test-prettier-versions (3.5.3)	21s
test-prettier-versions (3.7.2)	21s
test-prettier-versions (3.6.1)	25s
test-prettier-versions (3.7.3)	27s
test-prettier-versions (3.6.0)	23s
test-prettier-versions (latest)	20s
test-prettier-versions (3.7.1)	24s
	5m 59s

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