By now, we are going to speak about customizing something not in the code, but in WebStorm itself, so I must tell you about the multifarious settings that WebStorm offers.
There are two similar yet separate settings windows:
For the first case, to open the settings window, you can simply press either Ctrl + Alt + S (Windows) or ⌘ + , (Mac), and you will get the following screen:
To access project settings, select File | Default Settings, and you will get something similar to the WebStorm settings, but with a reduced list of configurable options.
I should say ...