"Required module not found" with Flow

[msolli]

I'm experimenting with Flow, but I'm getting errors when importing react-redux:

/Users/<...>/foo.js:4:33,45: react-redux
Required module not found

I've made the error go away by adding this to .flowconfig:

[options]
module.name_mapper='\(react-redux\)' -> '\1/lib/index'

This might by caused by facebook/flow#654. Maybe the error will go away when that issue is fixed. In the meantime, is there anything that could be done in react-redux to avoid the above work-around?

[gaearon]

I don't really know enough about Flow to fix this.
@leoasis, any ideas?

[leoasis]

Mmm since react-redux isn't even typed, perhaps a better option would be to just add it in the ignore paths?

If you feel adventurous you can even grab the declaration modules in here and try them so you can have the react-redux usage type checked (and redux and redux-thunk if you're using it). You'd need to put those files in a folder and specify them in the [libs] option in .flowconfig.

[msolli]

Thanks guys. I had stupidly ignored every package.json in my project in .flowconfig, which caused all sorts of strange problems. Sorry for the noise. I'll check out those declaration files.

[averyvery]

Ran into this issue myself with the flow config of

.*/node_modules/.*

[options]
module.system.node.resolve_dirname=apps

Other modules seem to import correctly, but for some reason flow throws "not found" for react-redux in particular. Still looking into this...

[averyvery]

Ah, my fix was to just create an empty stub and map to it:

export default {};

module.name_mapper='\(react-redux\)' -> '<PROJECT_ROOT>/flow/GeneralStub.js.flow'

[ericmasiello]

@averyvery can you give a bit more detail on your approach? where did you put these files?

[averyvery]

@ericmasiello sure:

// flow/GeneralStub.js.flow
export default {};

// .flowconfig
module.name_mapper='\(react-redux\)' -> '<PROJECT_ROOT>/flow/GeneralStub.js.flow'
module.name_mapper='\(immutable\)' -> '<PROJECT_ROOT>/flow/GeneralStub.js.flow'

[truemagic-coder]

Also works:
module.name_mapper='(react-redux)' -> 'empty/object'
module.name_mapper='(immutable)' -> 'empty/object'

[hipertracker]

What about https://github.com/flowtype/flow-typed ?