Next.js: [Error][v8.0.4] TypeError: (0 , _typeof2.default) is not a function

[wellyshen]

Bug report

Describe the bug

I am using v8.0.4. Everything OK in dev. But after I do next build and run my app the app stuck in server-side, then I get the TypeError: (0 , _typeof2.default) is not a function error. Does anyone has this issue?

To Reproduce

1. Go to this repo
2. Run yarn install
3. Run yarn build
4. Run yarn start
5. You can see the error

Expected behavior

App can run without TypeError: (0 , _typeof2.default) is not a function error like as dev.

Screenshots

System information

• OS: macOS 10.14.2
  
  
  
  • Node.js: 10.15.2
  
  
• Browser: Chrome
• Version of Next.js: v8.0.4

Additional Information

Here's my packages.json :

{
  "name": "",
  "version": "",
  "description": "",
  "main": "app/index.js",
  "author": "",
  "scripts": {
    "dev": "nodemon app/server --exec babel-node",
    "build": "next build app",
    "start": "NODE_ENV=production node app"
  },
  "babel": {
    "presets": [
      "@babel/preset-env",
      "next/babel"
    ]
  },
  "dependencies": {
    "@babel/register": "^7.4.0",
    "express": "^4.16.4",
    "next": "^8.0.4",
    "next-routes": "^1.4.2",
    "react": "^16.8.6",
    "react-dom": "^16.8.6"
  },
  "devDependencies": {
    "@babel/node": "^7.2.2",
    "nodemon": "^1.18.10"
  }
}

[timneutkens]

Please provide a full reproduction, it's impossible to help based on the description provided.

[devsnowy]

I'm having same issue on 8.0.4. Not sure but i think it looks related to: "next/babel" preset.

[arobert93]

Please show us your .babelrc file. I had the same problem and fixed by removing a @babel/preset-env. In the updated documentation it says:

The next/babel preset includes everything needed to transpile React applications. This includes:
preset-env

Good luck!