How to add Flow? or another Type Checker

[quinlanj]

hi @dogofpavlov, afaik you can use flow (Setting up Flow - #2 by notbrent), but its tricky because of errors from upstream repos:

Flow support for Expo?

I don’t think there are flow types for Expo yet. How i’m getting around it is, in my .flowconfig under [options] I added: module.name_mapper='^expo$' -> '<PROJECT_ROOT>/flowTypes/expoTypes' Then I created the folder ‘flowTypes’ and a file inside of ‘expoTypes’. // @flow const WebBrowser: any = {}; export default {}; export { WebBrowser }; Then I add every expo type in here that I eventually use so that it fixes my flow errors. Added bonus, is that it’s very easy to see what APIs i de…

Built-in support for Flow | Feature Requests | Expo