JavaScript boy and “lovely thoughtleader” 
he/him 
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4 weeks for a team doing in in their spare time to migrate 30k lines of code. Flow and TS are very similar, but our Flow coverage wasn't as good as it could have been, so certain modules were easier than others. It's more grunt work than technically difficult. Blog post coming!
Thanks got the details! This is a strongly typed app with zero third-party dependencies so seems like it would avoid some of the trouble the Jest migration had.
Yeah, probably! Only a small part of Jest was flow-strict and we went straight to strict mode for TS. If your code is already strict, it'll probably be easier. Also had to fight a bit with the exports to avoid breaking CJS compat and still export types so we could land in a minor
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