fix 'Cannot read property 'pop' of undefined'

[tdebarochez]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

This quick patch fix the error I get while building my app:

ERROR in chunk vendor [initial]
styles/vendor.2b18cc82139defdd381f.css
Cannot read property 'pop' of undefined
TypeError: Cannot read property 'pop' of undefined
    at MiniCssExtractPlugin.renderContentAsset (/Users/tdebarochez/repo/node_modules/mini-css-extract-plugin/dist/index.js:342:44)
    at Object.render (/Users/tdebarochez/repo/node_modules/mini-css-extract-plugin/dist/index.js:174:32)
    at Compilation.createChunkAssets (/Users/tdebarochez/repo/node_modules/webpack/lib/Compilation.js:2427:29)
...

Breaking Changes

N/A

Additional Info

Disclaimer: I absolutely don't know what I am doing. The only thing I know is that fix my build process. I didn't get this error before upgrading my package-lock.json to node v10.
If someone can tell me how to target the fail module, I could provide a reproductible test case.

[jsf-clabot]

All committers have signed the CLA.

[alexander-akait]

Need tests

[duvillierA]

Node@10.13
Webpack@4.25.1
babel@7
mini-css-extract-plugin@0.4.4

Fore more details, this issue appears when splitChunks.cacheGroups is set.

      splitChunks: {
        cacheGroups: {
          vendor: {
            test: /[\\/]node_modules[\\/]/,
            name: 'vendor',
            chunks: 'all',
            enforce: true
          }
        }
      }

[alexander-akait]

Invalid solution