040000 tree 67ac42659c9ee2fd38f8054789df5b4772930d5d	dart2js
040000 tree c9cb9cbb165386d974c2dd5f9d1d2f67872027d1	dart2js_extra
040000 tree 3bb09f691bff2079d25603ef3b2835f5b105c1c0	dart2js_foreign
040000 tree 6e80649f61d08063285a38135a80a70cde60fa6a	dart2js_native