There are shockingly few front end system design resources out there, probably because there's a lower demand and supply for front end engineer candidates.
"System" here typically refers to front end systems, which are quite different from the typical distributed system design questions for Software Engineering interviews. The questions asked can be quite similar to the possible questions in "Build user interfaces" format but with more focus on architecture and design. There's a significant amount of overlap between them - you will likely need to do some design (data model, API) when you build UI, and also do some coding here to illustrate your ideas/app state format.
