Cannot read property '__esModule' of undefined

Bug report

What is the current behavior? We have a components library where we have multiple entry points setup for components. Since we had nesting of components as well, we were ending up duplicating the code.

Hence we used the optimization block inside the config.

optimization: {
    splitChunks: {
      chunks: 'all',
      minChunks: 1,
      minSize: 1000,
      maxInitialRequests: Infinity,
      cacheGroups: {
        vendorCss: {
          test: /[\\/]node_modules[\\/](@hotstar\/isomorphic-style-loader|css-loader)[\\/]/,
          name: 'vendor_css_loaders',
          chunks: 'all',
        },
      }
    },

But after using this to bundle our components lib, and using this library inside the next.js app we get the error

TypeError: Cannot read property '__esModule' of undefined
    at /Users/ajayjaggi/Desktop/Hotstar/web-website/node_modules/@hotstar/web-ui-components-lib/modern/components/Molecule/CustomError/src/index.js:328:34
    at Object.<anonymous> (/Users/ajayjaggi/Desktop/Hotstar/web-website/node_modules/@hotstar/web-ui-components-lib/modern/components/Molecule/CustomError/src/index.js:330:12)
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:12)
    at Module.require (internal/modules/cjs/loader.js:974:19)
    at require (internal/modules/cjs/helpers.js:93:18)
    at Object.@hotstar/web-ui-components-lib/modern/components/Molecule/CustomError/src (/Users/ajayjaggi/Desktop/Hotstar/web-website/packages/website/.next/server/pages/_app.js:1273:18)
    at __webpack_require__ (/Users/ajayjaggi/Desktop/Hotstar/web-website/packages/website/.next/server/webpack-runtime.js:33:42)

which arises from here at 192 line.

If the current behavior is a bug, please provide the steps to reproduce. Mentioned above

What is the expected behavior? It should run without giving any errors

Other relevant information: webpack version: 5.40 Node.js version: 14.0.0 Operating System: mac os next.js version: 12.0.7

[vankop]

please create small reproducible repo, thanks

[webpack-bot]

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