Install libghc-wai-websockets-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-wai-websockets-doc
Description:
bridge between WAI and the haskell websockets library; documentation
The Web Application Interface provides a common protocol for communication between web applications and web servers. This package provides a bridge between WAI and the haskell websockets library. . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: http://github.com/yesodweb/wai
Version: 3.0.1.1-3build6
Section: universe/doc