Automated Graphql Operation Type Inference From Client Code

via “typescript type generation from graphql operations”

✏️ Apollo CLI for client tooling (Mostly replaced by Rover)

Unique: Implements a schema-aware code generator that preserves GraphQL semantics in TypeScript (nullable vs non-nullable, union discriminators, fragment spreads) through a dedicated apollo-codegen-typescript package that extends the core compiler. Generates both operation result types and variable types in a single pass, maintaining referential integrity.

vs others: More tightly integrated with Apollo Client than graphql-code-generator, with native support for Apollo-specific patterns like persisted queries and operation registry