What is “vala” Package?

Compiler for the GObject type system
For more details: https://live.gnome.org/Vala

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install vala.

  brew install vala

Now, use vala!