@Jancat Sorry, I don't understand your question. This module is called safe-buffer not buffer.

The safe-buff/index.js line 2

It throws the error:

Unable to resolve module buffer from ./node-modules/safe-buff/index.js: Module does not exist in the module map

Iam having the same error, actually the module buffer is not listed at package.json

@Jancat , do you also getting this error on react-native run-ios/run-android ? maybe it's happening because buffer is a native nodejs module, but may not work at react-native as a lot of native nodejs modules. At commonJS, is not necessary to require buffer.

I think it is my problem too (react-native context)

@lfernando-silva Yes, I'm woking on react-native too. Do you have a good idea to fix the issue or an alternative solution to use sha package in react-native?

I think installing buffer by npm install --save buffer and using rn-nodeify to makes adapt Buffer native module, it may to work, but not sure. Maybe you will adapt some other modules of sha package.

In my case, I just replaced bip39 lib to react-native-bip39 and this part is ok now, because does not uses safe-buffer.

Ok, thanks! I will have a try. @lfernando-silva

You might find this issue useful if you're using react-native: facebook/react-native#14796