I know this is named launchParams, but I was really hoping this would be able to get any navigation (even from other windows) and let me decide if they should open in my app or not.

What if someone clicks on a link to the app from another website, or I want to support integration with other platforms?
If those links are crafted to go to different parts of my website.

So for instance, I have an installed pwa on http://localhost right now. Clicking this link here doesn't open the app. I think it should.
I wouldn't mind using the serviceworker for this. It would be really nice if there were an event that I could capture the navigation and either direct the load to the app (and be able to safely focus the window to the front) or let it continue in a new tab.