"Required module not found" for module that exists in node_modules

Question

Some modules just seem to be invisible to Flow. For example I have react-native-overlay installed via npm into my node_modules directory but I get a whole bunch of errors like this from Flow:

[js/components/DatePickerOverlay.js:18
 18: let Overlay = require('react-native-overlay');
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ react-native-overlay. Required module not found

This module doesn't have types so it would be fine if I could just get Flow to ignore it entirely.

Here's my .flowconfig (based on React Native's one):

https://gist.github.com/almost/20c6caf6d18d0e5c689f

As you can see I'm on flow 0.20.1 and I have module.system=haste (as required by React Native)

I tried adding a //$FlowIgnore comment to the import lines but then Flow complains about an unneeded ignore comment! I also tried creating a react-native-flow.js.flow file with a dummy export which seemed to work at first but then after a flow restart stopped working.

Any ideas for how to either help Flow find this module or make it ignore the import line completely?

Answer 1

Looks like you're ignoring it here: https://gist.github.com/almost/20c6caf6d18d0e5c689f#file-flowconfig-L42-L50

If you don't mind manually typing it up, add a react-native-overlay.js to your interfaces and type up a couple signatures.