fix: compatibility with webpack v5

src/index.js

@@ -205,10 +205,15 @@ class MiniCssExtractPlugin {
  pluginName,
  (result, { chunk }) => {
  const { chunkGraph } = compilation;
+ // TODO remove after drop webpack v4
+ const { HotUpdateChunk } = compiler.webpack
+ ? compiler.webpack
+ : // eslint-disable-next-line global-require
+ require('webpack');
 
  // We don't need hot update chunks for css
  // We will use the real asset instead to update
- if (chunk instanceof compiler.webpack.HotUpdateChunk) {
+ if (chunk instanceof HotUpdateChunk) {
  return;
  }