Cannot find module react-scripts

Description

Fail to run create-react-app.cmd.

Expected behavior

create-react-app.cmd should create a react project without errors.

Actual behavior

PS D:\git> create-react-app.cmd r Creating a new React app in D:\git\r.

Installing packages. This might take a couple minutes. Installing react-scripts…

Error: Could not find or load main class add module.js:472 throw err; ^

Error: Cannot find module ‘D:\git\r\node_modules\react-scripts\package.json’ at Function.Module._resolveFilename (module.js:470:15) at Function.Module._load (module.js:418:25) at Module.require (module.js:498:17) at require (internal/module.js:20:19) at checkNodeVersion (C:\Users\myh\AppData\Roaming\npm\node_modules\create-react-app\index.js:225:21) at C:\Users\myh\AppData\Roaming\npm\node_modules\create-react-app\index.js:179:5 at ChildProcess.<anonymous> (C:\Users\myh\AppData\Roaming\npm\node_modules\create-react-app\index.js:165:5) at emitTwo (events.js:106:13) at ChildProcess.emit (events.js:191:7) at ChildProcess.cp.emit (C:\Users\myh\AppData\Roaming\npm\node_modules\create-react-app\node_modules\cross-spawn\lib\enoent.js:40:29)

Environment

1. npm ls react-scripts: D:\git – (empty)
2. node -v: v7.4.0
3. npm -v: 4.1.1
4. Operating system: Windows 10 Enterprise 64-bit build 14393.576
5. Browser and version: Firefox 50.1.0
6. create-react-app: 1.0.2

[gaearon]

I see, that’s frustrating. We need to add better error handling for npm failures. In the meantime please copy and paste this into your package.json:

{
  "name": "r",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "react-scripts": "0.8.4"
  },
  "dependencies": {
    "react": "^15.4.2",
    "react-dom": "^15.4.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }
}

Then run npm install.

Sorry for the trouble.

[gaearon]

OK, I think I understand the issue now.

You have something called yarn on your system which is a Java program. Create React App thinks it is Yarn package manager and attempts to use it instead of npm.

This is the same issue as https://github.com/facebookincubator/create-react-app/issues/1257. As a temporary workaround you can remove yarn from your path. I understand it’s inconvenient. Would you like to submit a PR for detection code to use yarnpkg instead as described here?

cc @fson