This is an example of how I use relayjs, it includes the way I mix in client only schema. This is a work in progress, and may have mistakes because I wrote it without referencing the actual use cases where these patterns arose.
Mostly everything is the same as a regular CRA app.
Run it with:
yarn start
To run the relay compiler, use:
yarn relay
Graphql files in the src directory get loaded for client only use, as you see
in src/clientExtensions.graphql.
You can also run yarn relay -u <api-url> to have it grab the remote schema
and pull it down for you.