Because it's simple to use and isn't overcomplicated with tonnes of options.
Flexbox is the default, but it does fall back if flexbox is not supported. If you don't want the fall back, you can switch it off by setting this variable to false ($flexbox-fallback: false).
The test check that it falls back to flexbox if it's not compatible or if it's optionally turned off.
-e
in nodemon specifies the extension. Can be a comma separated list.
Node that when adding new scripts into the bin
dir, they need to be made executable so that can be run from the terminal.
To do this, you have to change the permissions using:
chmod +x /path/to/your/filename