Interview Questions
Initialize through ApolloClient constructor, configuration options. Set up cache, link configuration. Features: network interface, cache setup. Essential for client creation.
Essential options include: uri for GraphQL endpoint, cache implementation, default options. Configure link chain, error handling. Features: request policies, connection settings.
Cache configuration through InMemoryCache options, type policies. Set up field policies, cache behavior. Features: normalization settings, custom identifiers.
Apollo Link configures request pipeline, middleware chain. Set up network handling, error processing. Features: request modification, response handling.
Authentication setup through context, headers configuration. Implement token management, auth middleware. Features: request authorization, session handling.
Local state through cache configuration, local resolvers. Set up client-side fields, local mutations. Features: local data management, cache integration.
Error handling through onError link, global handlers. Set up error policies, retry logic. Features: error transformation, recovery strategies.
Fetch policies control cache/network behavior. Configure default policies, per-query settings. Features: cache usage, network requests.
Subscription setup through WebSocket link, protocol configuration. Configure connection parameters, client options. Features: real-time updates, connection management.
Persisted queries through automatic persisting, cache configuration. Set up query registry, automatic extraction. Features: query optimization, network efficiency.
Development tools through Apollo DevTools integration, debugging options. Set up logging, inspection tools. Features: cache inspection, query debugging.
Type policies through cache configuration, field definitions. Set up custom field behavior, merge functions. Features: cache normalization, field computing.
Testing setup through MockedProvider, test utilities. Configure mock responses, network behavior. Features: query testing, mutation verification.
Fragment matching through IntrospectionFragmentMatcher, type configuration. Set up union types, interface handling. Features: type resolution, fragment support.
Batch operations through Apollo Link Batch, queue configuration. Set up request batching, timing options. Features: request optimization, network efficiency.