• I'd be willing to implement a fix

Describe the bug

I was working on a create-react-app project, and I had to install a package and so I did. It was working as expected, but when I tried to use the package I installed in my code, this error appeared.

./src/App.js Module not found: Something that got detected as your top-level application (because it doesn't seem to belong to any package) tried to access a package that is not declared in your dependencies 

To fix this, I had to restart the building process, which is bad when I am expecting for a hot-reload.

To Reproduce

yarn dlx create-react-app cra cd cra yarn start # without interrupting the process, on another tab yarn add random yarn install # try to consume the random package 

Environment if relevant (please complete the following information):

• OS: Linux
• Node version 12.14.0
• Yarn version 2.0.0-rc.27