September 2026 Summaries

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Nx can provide end-to-end type safety between a C# backend and TypeScript frontend in a polyglot monorepo by generating TypeScript types from a .NET API’s OpenAPI specification and incorporating the process into its task graph. Using the @nx/dotnet plugin, Nx infers .NET project builds and dependencies, while ASP.NET Core produces an OpenAPI JSON document during the API build; the @hey-api/openapi-ts generator then converts that document into TypeScript types, including API field descriptions as JSDoc. By declaring an implicit dependency from the types library to the API, configuring code generation to depend on the API build, and hashing dependent task output files, Nx ensures regenerated types reflect API-contract changes while preserving cache efficiency when outputs are unchanged. Target defaults further make build, serve, and typecheck tasks run code generation before consuming projects compile, so changes such as renaming a C# DTO property automatically cause affected TypeScript code to fail type checking. Although the example uses OpenAPI, the same build-schema-generate-task-graph pattern can support protobuf, GraphQL, or database schemas, and several community Nx plugins can automate parts of the OpenAPI workflow.