The full error message is
'node-sass' usage is deprecated and will be removed in a future major version. To opt-out of the deprecated behaviour and start using 'sass' uninstall 'node-sass'.
So, I think the only solution that you can try is obvious, just uninstall node-sass.
=> I already uninstalled it and tried ng serve and ng build --prod all is working fine.
FYI, I as a developer always have found this library node-sass as a pain in the head because of its incompatibility errors. I am happy that we don't have to use it and deal with its painful errors anymore.
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