There is a missing dependency in the root installation of a custom node module

Currently, I have a project for an app and two separate node module projects. The dependency structure looks something like this:

App {
  NodeModule1 {
    NodeModule2,
    ...
  },
  ...
}

The issue I am facing is that instead of NodeModule2 being installed in the root directory of the app's node_modules App/node_modules/NodeModule2, it is actually installed in 

App/node_modules/NodeModule1/node_modules/NodeModule2

This unexpected location is causing runtime errors where NodeModule2 is not found. My temporary solution has been to directly add NodeModule2 into the App folder, but this is not an ideal long-term fix.

All other dependencies of NodeModule1 are correctly installed at App/node_modules as expected.

Here is the package.json file for NodeModule2:

{
  "name": "NodeModule2",
  "version": "0.0.2-20210202.1.0",
  "private": false,
  "description": "",
  "author": "",
  "license": "ISC",
  "peerDependencies": {
    "react": "16.13.1",
    "react-native": "0.59.10",
    ...
  }
}
javascriptnpmnode-modules

Answer №1

I UNDERSTAND NOW

In order for a sub node_module to appear on the root level, all of its peerDependencies versions must match those of the App.

In my situation, both my App and NodeModule1 have a dependency on react-native-picker-select, but with different versions.

App {
  dependency: {
    "react-native-picker-select": "^8.0.0"
  }
}

NodeModule1 {
  dependency: {
    "react-native-picker-select": "8.0.0"
  }
}

NodeModule2 {
  peerDependency: {
    "react-native-picker-select": "8.0.0"
  }
}

In this instance, App received version 8.0.4 and NodeModule1 received version 8.0.0. Yarn placed NodeModule2 under NodeModule1 to share the same dependency version 8.0.0.

Solution: Ensure that all versions are aligned in App, NodeModule1, and NodeModule2.

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