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Re:Porting 30K lines of code from Flow to TypeScript by russley on Monday January 14, 2019 @04:34PM (#18906752)
There's also a good TypeScript playground clone here as well:

https://agentcooper.github.io/typescript-play/

Re:Porting 30K lines of code from Flow to TypeScript by styfle on Monday January 14, 2019 @04:44PM (#18906825)
This links to the same code as my post. You might just have an older bookmark. See this PR[0].

[0]: https://github.com/agentcooper/typescript-play/pull/24