Throughout the course of this chapter, we will be working directly with the PostCSS API (or a plugin's individual API, if it has one). As we are working directly on CSS (and not simply through a plugin's configuration object), it makes sense to install a syntax highlighter that works with PostCSS.
Not every text editor has one, but if you happen to use Sublime Text, with the Package Control facility installed (and I am assuming this is the case for the demos in this book), then it has a highlighter available for PostCSS that we can install. The plugin is available at https://github.com/hudochenkov/Syntax-highlighting-for-PostCSS. Let's get it installed using the following steps:
Open up Sublime Text, then press Cmd + Shift + P (OS X) or Ctrl + Shift + P (Linux/Windows) to open the command palette.
From the list that appears, click on Package Control: Install Package.
After a few moments, it will show a new list; start typing
Syntax Highlighting for PostCSS
:When it appears...