官方自己对升级的意见：
Note
Don’t feel pressured to upgrade anything. If you’re satisfied with the current feature set, its performance, and reliability, you can keep using the version you’re currently at! It might also be a good idea to let the 2.0 release stabilize a little bit before switching to it in production.
也就是说，对于正经大项目来说，可以不用升，或者是等等再升比较保险。毕竟对于开源盛行的今天来说，正式版的第一版都是当过去的 beta 版在用……
【 在 eGust (十年) 的大作中提到: 】
: Create React App 2.0: Babel 7, Sass, and More
:
https://reactjs.org/blog/2018/10/01/create-react-app-v2.html: October 01, 2018 by Joe Haddad and Dan Abramov
: ...................
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