https://derickbailey.com/2017/04/18/you-need-es7s-async-functions-heres-why/
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https://derickbailey.com/2017/04/18/you-need-es7s-async-functions-heres-why/
origin - http://www.pipiscrew.com/2017/04/you-need-es2017s-async-functions-heres-why/ you-need-es2017s-async-functions-heres-why