typescript-vs-flowtype - Differences between Flowtype and TypeScript -- syntax and usability

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Both TypeScript and Flow are very similar products and they share most of their syntax with some important differences. In this document I've tried to compile the list of differences and similarities between Flowtype and TypeScript -- specifically the syntax, usage and usability. This document might be incomplete and/or contain mistakes and was last updated to describe TypeScript 3.0 and Flow 0.79.1.

https://github.com/niieani/typescript-vs-flowtype

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