Bug: Cannot create a build of the project

[ronaldgj]

React version: 17.0.2

Steps To Reproduce

1. Clean install with npx create-react-app app-name (without Typescript)
2. After install go in to folder and run npm run build.

The current behavior

You'll get an error about the MiniCssExtractPlugin.

TypeError: MiniCssExtractPlugin is not a constructor

The expected behavior

It should create a build version of the app 🙂

[RelishedChicken]

I can confirm having the same issue on a react app I created 1 hour ago. I can neither build or deploy.

[Severenit]

I also can confirm having the same issue on a react app. I can neither build or deploy.

[Lundeful]

More info
#11930

The temporary fix (mentioned in the issue) of editing the package.json to specify an earlier version of mini-css-extract-plugin worked for me. Just remember to run yarn/npm install.

[astalarico]

I also can confirm having the same issue.

[Micah-6424]

yeah, its still not working

[ShernanJ]

Downgrading the version fixed it, add this into package.json.

"resolutions": {
    "mini-css-extract-plugin": "2.4.5"
},

[hamilton-mike]

Hello, @ShernanJ I've added the code to my package.json and I'm still getting the TypeError.

[ShernanJ]

@hamilton-mike try to delete your node_modules folder, While you still have the code above inside package.json, then reinstall your packages with npm install.

[hamilton-mike]

@ShernanJ still no bueno. getting the same error.

[LaetitiaBodin]

Same issue here.
What is weird : I can run npm run start without problem (at least, all is not lost), but npm run build just fails.
And yes, I've used the fix npm i -D --save-exact mini-css-extract-plugin@2.4.5 but the issue still remains and I've tried clearing the cache, reinstalling npm and so on.

[JakeSchieber]

Resolutions only works if using yarn, see: #11930 (comment)

npm i -D --save-exact mini-css-extract-plugin@2.4.5 and npm install worked for me.

[iaseth]

I faced the same problem and shared the solution here #11934

[hamilton-mike]

@iaseth thank you for the share.