TroubleShooting
Module not found: Can't resolve 'styled-components'
If you encounter the error Module not found: Can't resolve 'styled-components' in [...]
it probably means that you
need to install the styled-components library in your project as stated
in the Get Started guide.
Indeed, components-extra relies on styled-components for its styling system. It is not included in the bundle in order to prevent any duplicated instance of styled-components in your final bundle.
Module not found: Can't resolve '@material-ui/core'
If you encounter the error Module not found: Can't resolve '@material-ui/core' in [...]
it probably means that you
need to install the @material-ui/core >= 4.0.0 library in your project as stated
in the Get Started guide.
Indeed, all the components are built on top of Material-UI.