Unable to configure mobx in monorepo (using yarn workspaces) - reactjs

Question

I am trying to setup a monorepo with react and react native app using a yarn workspaces.
My problem is with mobx (and react-mobx) library. When I use it in the shared package it does not work.
Here is the simple component in the shared library. It should just render a button and number and increment the number when the text is clicked:
import React, {Fragment} from 'react'
import {action, decorate, computed, observable} from 'mobx'
import {observer} from 'mobx-react'
class Store {
_number = 0
increment = () => {
this._number++
}
get number() {
return String(this._number)
}
}
// All of those are defined
console.log('TEST', {action, decorate, computed, observable, observer})
decorate(Store, {
_number: observable,
increment: action,
number: computed,
})
class TestComponent extends React.Component {
static defaultProps = {
clickableComponent: 'button',
numberElement: 'div',
}
store = new Store()
render() {
const {clickableComponent: ClickableComponent, numberElement: NumberElement} = this.props
const {number, increment} = this.store
return <Fragment>
<ClickableComponent onClick={increment}>Incremenet</ClickableComponent>
<NumberElement>{number}</NumberElement>
</Fragment>
}
}
export default observer(TestComponent)
In browser (react) app I get the following error:
Failed to compile
PATH_TO_PROJECT]/monorepo-rn/node_modules/mobx-react/index.module.js
Module not found: Can't resolve 'react-dom' in '[PATH_TO_PROJECT]/monorepo-rn/node_modules/mobx-react'
In native app (react-native) I get the following runtime error:
error: bundling failed: Error: Unable to resolve module `react-native` from `PATH_TO_PROJECT]/monorepo-rn/node_modules/mobx-react/native.js`: Module `react-native` does not exist in the Haste module map
I think the problem is with packages and linking them. There are couple of things I've tried to fix this issue, none of them worked:
Add mobx and mobx-react into workspaces.nohoist
Move all dependencies of the shared library into peerDependencies
Make sure to use mobx#4.x so it is compatible with react-native
Here is the root package.json:
{
"name": "monorepo-rn",
"private": true,
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"workspaces": {
"packages": [
"packages/**"
],
"nohoist": [
"**/react-native",
"**/react-native/**"
]
},
"scripts": {
"run:web": "yarn workspace web start",
"run:native:ios": "yarn workspace nativeapp react-native run-ios",
"run:native:android": "yarn workspace nativeapp react-native run-android"
}
}
Here is the package.json of the shared package:
{
"name": "test-component",
"version": "1.0.0",
"main": "src/index.js",
"license": "MIT",
"scripts": {
"build": "babel src --out-dir lib"
},
"peerDependencies": {
"mobx": "^4.x",
"mobx-react": "^5.x",
"react": "^16.x",
"react-dom": "^16.x"
},
"devDependencies": {
"#babel/cli": "^7.2.3",
"#babel/core": "^7.2.2",
"#babel/plugin-proposal-class-properties": "^7.3.0",
"#babel/preset-env": "^7.3.1",
"#babel/preset-react": "^7.0.0",
"mobx": "^4.9.2",
"mobx-react": "^5.4.3",
"react": "^16.7.0",
"react-dom": "^16.7.0"
},
"dependencies": {}
}
Here is the package.json of the webapp:
{
"name": "web",
"version": "0.1.0",
"dependencies": {
"mobx": "^4.9.2",
"mobx-react": "^5.4.3",
"react": "^16.7.0",
"react-dom": "^16.7.0",
"react-scripts": "2.1.3",
"test-component": "1.0.0"
},
"scripts": {
"start": "SKIP_PREFLIGHT_CHECK=true react-app-rewired start",
"build": "SKIP_PREFLIGHT_CHECK=true react-app-rewired build",
"test": "react-app-rewired test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": [
">0.2%",
"not dead",
"not ie <= 11",
"not op_mini all"
],
"devDependencies": {
"react-app-rewire-babel-loader": "^0.1.1",
"react-app-rewired": "^2.0.3"
}
}
And here is the package.json of the react-native app:
{
"name": "nativeapp",
"version": "0.0.1",
"private": true,
"scripts": {
"start": "node node_modules/react-native/local-cli/cli.js start",
"test": "jest"
},
"dependencies": {
"test-component": "1.0.0",
"mobx": "^4.9.2",
"mobx-react": "^5.4.3",
"react": "16.6.3",
"react-native": "0.58.3"
},
"devDependencies": {
"babel-core": "^7.0.0-bridge.0",
"babel-jest": "24.0.0",
"jest": "24.0.0",
"metro-react-native-babel-preset": "0.51.1",
"react-test-renderer": "16.6.3"
},
"jest": {
"preset": "react-native"
}
}
I am using the latest yarn version to date: 1.13.0
I've created a repo with which it is possible to replicate the issue I have here.
If anyone will be able to help me get it working I will be insanely grateful!

Answer 1

I've figured it out. I needed to add mobx-react into nohoist of the root package.json file (see the snippet bellow). I had to tweak the native configuration lite bit (I've used react-native-monorepo-helper). The app now works on all platforms as it should.
The fix was to add following nohoist into the root package.json:
"nohoist": [
"**/react-native",
"**/react-native/**",
"**/mobx-react/**",
"**/mobx-react"
]
See this repo. It now contains working code.