Type Checking In JavaScript: Getting Started with Flow.
Jihdeh Stephens

Why not use Typescript? You still have to transpile code, so I would be opting for using Typescript instead of flow,because then I would be using only 1 tool to add types and handle transpiling to ES5, whereas with flow I additionally need Babel.

Also with Typescript you get type definitions for external libraries. I don’t think that feature exists with flow.

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