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Why
How
rollup/rollup-plugin-babel#260 (comment)
Test
Before
![Jietu20190810-150240](https://user-images.githubusercontent.com/27187946/62818897-62d75d00-bb80-11e9-8424-a7605dab2e8b.jpg)
After
![Jietu20190810-150326](https://user-images.githubusercontent.com/27187946/62818902-72ef3c80-bb80-11e9-8361-395a653a3fdd.jpg)