webpack.js.org | Repository for webpack documentation | Plugin library

+There seems to be an issue with the new release 4.0.2 of create-react-app [Reference].
You can use the previous, 4.0.1, by doing the following.

1. Edit package.json and change the "react-scripts" value to "4.0.1".
2. Run npm install.
3. Run npm start.

The less-loader plugin converts Less files to CSS. The rule should be:

Webpack, on it's own is just a Javascript bundler, if you have modern JS features, webpack will not understand this,.

Luckily, babel and webpack work well together, so to get ESNext features, you will want to include the babelLoader..

https://webpack.js.org/loaders/babel-loader/

The answer was in my dependencies. I had written a class which this class depended upon. The parent class was not compiled, so webpack was trying to compile both at the same time.

After many hours I stumpbled upon this which led me to solving the issue. https://github.com/markdalgleish/static-site-generator-webpack-plugin/issues/79

Hey, update; After looking around a tad, it looks like for me, this error is coming from isomorphic-fetch dependency (https://github.com/matthew-andrews/iso…). Seems similar to document is not defined kind of issues people get, since this pre rendering doesn't happen in a browser context. I don't have any more time to look at it today for why that's the case or for solutions, but that's my hunch. Check your polyfills and dependencies.

You've included css-loader as a use rule for png|woff|woff2|eot|ttf|svg assets, however css-loader doesn't handle image assets. Please remove it as a rule for that particular test and either only use url-loader or file-loader.

It comes from webpack where it seems to be an open issue. The causes of that issue was identified and recently added to the proposals of the new release for webpack. It could arrive somewhere in 2022 as stated here Class Fields (Private instance methods and accessors

You could either get rid of that addon that fails with webpack or try some of the quick-fixes suggested like this one here

With hint from Akxe I managed to solve the issue in following way:

@angular-devkit/build-angular has builder @angular-builders/custom-webpack:dev-server described here. I added this builder to angular.json file at my project like this:

I have not been able to identify a direct solution to the problem posed above. However, for anyone reading, I've come to discover that this can be accomplished by utilizing a package called before-build-webpack, notably by including the watch-run trigger.

You need to add your sass loader in your rules: