Export flow type definitions in npm package

[wwwdata]

Hi,

thanks for this awesome library. In our project we are also using flow. But in the npm package, you include the src folder with flow annotations but don't ship it with your decls folder that includes all the types.

For now I will just copy paste your stuff from the decls folder but since more and more people are using flow a working "out of the box" solution with type support would be awesome thanks!

[jfairbank]

Thanks for opening the issue @wwwdata! I'll work on this as soon as I can, but you're welcome to open a PR too!

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[KaushikIyer16]

hi, i would like to work on this, could you provide me with some context, my knowledge of flow is limited to none

Thanks