Silly question, using Apollo Frontend without corresponding apollo server for rapid proof of concept dev, Apollo or Prisma server backend will come later. Does anyone know of clever ways to mock purely on the client side without ever making HTTP calls?

Wrap it with

MockedProvider

https://www.apollographql.com/docs/react/recipes/testing.html#MockedProvider

You could also look into PollyJS by Netflix. I haven't used it yet, but I plan on trying it out.

This is interesting, will take a look, thanks!