Typeerror: minicssextractplugin is not a constructor [SOLVED]

How to fix the “typeerror: minicssextractplugin is not a constructor” error message? In this article, we will show you the solutions to resolve this kind of typeerror.

But before we dive into the solutions, we must first understand what this error is all about.

It is because, if we have a better understanding of this “minicssextractplugin is not a constructor” error, it will be easier for you to fix it, and certainly we will guide you in doing that, so keep on reading.

What is “minicssextractplugin”?

The minicssextractplugin is a tool that is used in Webpack to extract CSS code from JavaScript bundles.

What is “typeerror: minicssextractplugin is not a constructor” error message?

The “typeerror: minicssextractplugin is not a constructor” error message indicates that there is a problem with the way the “minicssextractplugin” is being used in your code.

It happens when you are trying to use “minicssextractplugin” as a constructor, however it is not able to do so.

Why does this typeerror occur?

This may be due to a various of issues, such as:

  • An incorrect installation or configuration of the plugin.
  • It is possible that the plugin is not properly installed or configured in your project.

How to fix “typeerror: minicssextractplugin is not a constructor”

The following are the solutions you use to fix the “minicssextractplugin is not a constructor” type error:

1. Check that mini-css-extract-plugin is installed and imported correctly.

This code will check if mini-css-extract-plugin is installed and imported correctly. It should be imported using the following syntax:

const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  // ... other Webpack configuration options ...
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'style.css'

However, if you cannot update the package well, alternatively, you can use the syntax below in your webpack config file:

const MiniCssExtractPlugin = require("mini-css-extract-plugin").default;

2. Check the syntax of the plugin instantiation

Check the syntax of the MiniCssExtractPlugin instantiation in your Webpack configuration file.

Here’s an example of the correct syntax that you may use:

plugins: [
  new MiniCssExtractPlugin({
    filename: '[name].[contenthash].css',
    chunkFilename: '[id].[contenthash].css',

3. Check the compatibility of the plugin and Webpack versions

Ensure that the versions of mini-css-extract-plugin and Webpack are compatible with each other.

Here’s an example of how to check the versions of Webpack and mini-css-extract-plugin in your project:

npm ls webpack mini-css-extract-plugin

4. Reinstall mini-css-extract-plugin

You can also try to reinstall the mini-css-extract-plugin if the problem persists.

To uninstall:

npm uninstall mini-css-extract-plugin

To reinstall:

npm install mini-css-extract-plugin

By doing so, it ensures that the plugin is installed correctly and all dependencies are up-to-date.

5. Add the following to file package.json

When the above solutions do not resolve the error, you can add the following to file package.json:

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

Use the following command for npm:

npm i -D --save-exact [email protected]


By executing the different solutions that this article has given, you can easily fix the “typeerror: minicssextractplugin is not a constructor” error message.

We are hoping that this article provides you with sufficient solutions; if yes, we would love to hear some thoughts from you.

You could check out other “typeerror” articles that may help you in the future if you encounter them.

Thank you very much for reading to the end of this article. Just in case you have more questions or inquiries, feel free to comment, and you can also visit our official website for additional information.

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