This repo contains a small test case which demonstrates an issue introduced with mini-css-extract-plugin v0.8.1 whereby the context property for instances of CssModule is set to null resulting in errors like:

TypeError: Cannot read property 'includes' of null

After cloning this repository:

1. Run npm install to install of the required dependencies
2. Build the test file with npm run build or npx webpack
3. This should fail
4. Install the previous version of the mini-css-extract-plugin:

   npm i mini-css-extract-plugin@0.8.0

5. Run the build again