configureMiniCssExtractPlugin(loaderOptionsCallback, pluginOptionsCallback = () => {}) {
        webpackConfig.configureMiniCssExtractPlugin(loaderOptionsCallback, pluginOptionsCallback);

        return this;
    }
Configure the mini-css-extract-plugin.

https://github.com/webpack-contrib/mini-css-extract-plugin#configuration

```
Encore.configureMiniCssExtractPlugin(
    function(loaderConfig) {
        // change the loader's config
        // loaderConfig.reloadAll = true;
    },
    function(pluginConfig) {
        // change the plugin's config
        // pluginConfig.chunkFilename = '[id].css';
    }
);
```

@param {OptionsCallback<import('mini-css-extract-plugin').LoaderOptions>} loaderOptionsCallback
@param {OptionsCallback<import('mini-css-extract-plugin').PluginOptions>} pluginOptionsCallback
@returns {Encore}