Trouble building apk with expo

Expo Development Tools
1

I’m trying to build my app into an apk via expo build:android -t apk, and I get the following error:

Failed building JavaScript bundle.
While trying to resolve module crypto from file C:\Users\USER\Desktop\Programming\Twitter\HiverMobile\node_modules\@steemit\rpc-auth\lib\index.js, the package C:\Users\USER\Desktop\Programming\Twitter\HiverMobile\node_modules\crypto\package.json was successfully found. However, this package itself specifies a main module field that could not be resolved (C:\Users\USER\Desktop\Programming\Twitter\HiverMobile\node_modules\crypto\index.js. Indeed, none of these files exist:

  • C:\Users\USER\Desktop\Programming\Twitter\HiverMobile\node_modules\crypto\index.js(.native|.ios.expo.ts|.native.expo.ts|.expo.ts|… and it continues with a list of files.

Here’s my expo diagnostics:
Expo CLI 3.21.13 environment info:
System:
OS: Windows 10 10.0.18363
Binaries:
Node: 12.16.3 - C:\Program Files\nodejs\node.EXE
npm: 6.14.4 - C:\Program Files\nodejs\npm.CMD
IDEs:
Android Studio: Version 4.0.0.0 AI-193.6911.18.40.6514223
npmPackages:
expo: ~38.0.1 => 38.0.3
react: ~16.11.0 => 16.11.0
react-dom: ~16.11.0 => 16.11.0
react-native: https://github.com/expo/react-native/archive/sdk-38.0.0.tar.gz => 0.62.2
react-native-web: ~0.11.7 => 0.11.7

2

For anyone coming across the same type of error, the issue is that react native doesn’t support the node standard library. So the node crypto library won’t work.

3

Thanks for sharing the solution with us @revolutionist. In case you weren’t already aware, we do have a Crypto module built into Expo. https://docs.expo.io/versions/v38.0.0/sdk/crypto/

Cheers,
Adam

4

This topic was automatically closed 20 days after the last reply. New replies are no longer allowed.