Configure Karabiner with Goku
Karabiner-Elements is a macOS utility for keyboard customization. I've been using it for years. It uses a verbose JSON configuration which can be painful to work with.
Goku lets you use the edn for configuration, which makes it a lot easier.
Here's a quick sample for one of the most common Karabiner use cases:
{:des "caps_lock to esc when pressed alone, to ctrl as modifier" :rules [[:##caps_lock :left_control nil {:alone :escape}]]}