How to start?

Run yarn to install packages and then yarn dev to run.

Points of interest?

• In RelayEnvironment.ts we're enabling the error handling feature flags ENABLE_FIELD_ERROR_HANDLING and ENABLE_FIELD_ERROR_HANDLING_THROW_BY_DEFAULT.
• Also in RelayEnvironment.ts we are returning mocked responses, where we're simulating an error only for the second query AppReviewsQuery.
• In App.tsx we're defining two nested queries, where only the inner one fails. Since both queries share the same signature though productById(id: "product-1"), the errors of the second query are (wrongfully?) propagated to the first query.