Delta queries

Wojciech Trocki explains how GraphQL can make React Native apps more resilient and reactive when backend data is delayed or unreliable. He covers client-side GraphQL, including local resolvers, REST access, normalized caching, fetch policies, optimistic responses, and reactive queries. He introduces Apollo Effects as a way to add offline changes, conflict resolution, and cache updates, then presents Graphback and GraphQL CLI as tools for generating client and server code from data models. The talk closes with GraphQL subscriptions and delta queries for delivering live updates while limiting the data sent to clients.