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Re:TypeScript support added to Create React App by kumarharsh on Tuesday October 23, 2018 @12:05AM (#18280642)
That feature is for JS files. It helps you convert your JS project into flow/TS in a piecewise manner. Otherwise you'll have to do a major rewrite in a very short amount of time.
Re:TypeScript support added to Create React App by smt88 on Tuesday October 23, 2018 @01:55AM (#18281028)
> Otherwise you'll have to do a major rewrite in a very short amount of time.

This just isn't true. TS was designed from the beginning to allow gradually adding types. Whether transpiling or using comments, you can change one file at a time.

Re:TypeScript support added to Create React App by sibeliuss on Tuesday October 23, 2018 @02:21AM (#18281121)
Indeed -- interop works _very_ well.