NOTE (2022-07-09): Xcode finally added this functionality in Xcode 14, please see release notes here:
New Features in Xcode 14 Beta 3
When editing code, the Edit > Duplicate menu item and its corresponding keyboard shortcut now duplicate the selected text — or the line that currently contains the insertion point, if no text is selected. (8614499) (FB5618491)
These are instructions to create a series of buttons within the Apple Home app that control PS4 power and open/close any app you want.
Install Node.js
Begin by installing Node.js if you haven't already. Their website has up-to-date versions and installation instructions for your OS.
For macOS I use Homebrew to install packages. If you're a developer (or an aspiring one), I highly recommend using it. Via homebrew, installing node is as simple as brew install node.