Expo won't build with locally installed NPM packages - expo

Question

I am using expo#43.0.3 (and expo-cli#5.0.3) to manage my react native project and I have to install an npm package from local source:
$ npm install /path/to/mypackage
In my package.json the package is successfully linked via
"dependencies": {
...
"myPackage": "file:../../mypackage",
...
}
I can also confirm the package works when installing to a new plain node project (same node version 14.8.2)
Now when I start expo via expo start and navigate to the app it does not throw any error but only a warning:
› Reloading apps
warn No apps connected. Sending "reload" to all React Native apps failed. Make sure your app is running in the simulator or on a phone connected via USB.
When using the package from registry everything builds, however.
I tried to use the private packages section form the expo docs, but they only describe how to use private packages from registry but not local.
Anything I'm missing here?
edit:
After resetting the expo network adapters it loads the bundle but it now says it can't find the package:
Unable to resolve module myPackage from /home/user/path/to/myPackage/file.js: myPackage could not be found within the project or in these directories:
node_modules
If you are sure the module exists, try these steps:
1. Clear watchman watches: watchman watch-del-all
2. Delete node_modules and run yarn install
3. Reset Metro's cache: yarn start --reset-cache
4. Remove the cache: rm -rf /tmp/metro-*
However, I'm not using watchman and I'm not using yarn and rmoving metro- folders from /tmp did not make a difference.

Answer 1

As it turned out in this issue on GitHub it can be solved via npm pack:
run npm pack inside of your library and then npm install path/to/the/packed/file.tgz from your project
Which worked fine for the setup I described in the question.