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Thanks for this. I'm still relatively new to the Javascript world (mainly native developer) and I've only just started using flow.

Could you tell me a bit more about the following points:

* more definitions (This cannot be overstated; the gap is wide)

and

* great compiler

I'd love to hear more about this and or read some good articles comparing flow to typescript.

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typescript wants to be in your project from day one

flow can be added to an existing project

i feel that almost everyone underestimates how important this is

This seems to be a common misconception. TypeScript can be added gradually as well with strict settings disabled, and supports JavaScript with a config setting. With Babel now supporting TypeScript[1], none of these arguments prevail.

[1]: https://www.npmjs.com/package/babel-preset-typescript

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