This is a simple effect used in Retrogram which renders text with a fun bubble-style outline in SwiftUI
You can use it like this: RetroBubbleText(text: "Retrogram", size: 62, style: .large)
There are three styles (.large, .small and .tiny). I found these were necessary in practice as different fonts could show artifacts at different sizes, and for different letters
If you like this let me know on twitter