Exploring Polyglot Monorepos with Nx, TanStack and Rust

Polyglot monorepos combining JavaScript and Rust are becoming more practical as AI agents reduce the effort required to adopt additional languages and automate setup work. The example described converts a PNPM workspace containing a TanStack Start application into an Nx monorepo, adds a Rust-based Topcoat web application and shared Rust crates, and uses Cargo workspaces alongside PNPM rather than replacing either ecosystem’s native dependency management. The @monodon/rust Nx plugin exposes Cargo commands such as build, test, lint, and run as Nx targets, allowing JavaScript and Rust tasks to be executed together in dependency order through common Nx commands, pipelines, and caching. Rust-specific configuration includes separate Cargo target directories for each task to prevent artifact conflicts and cache inputs that account for Cargo files, toolchain versions, and workspace configuration. CI is configured through Nx Cloud and Nx Agents, with mise used consistently to install pinned Rust tooling locally and in GitHub Actions, while custom agent launch templates install and cache both Node.js and Rust dependencies so distributed agents can run tasks from either stack. The approach also supports affected-project execution, scalable task distribution, and optional publishing of Rust crates through Nx Release.

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