Discuss 'Project References' and their impact on Monorepo Scalability.

Project References allow a codebase to be split into logical units that compile incrementally via declaration files[cite: 1].

Large monorepos often suffer from slow compilation because the compiler loads every file. Project References allow you to define dependencies between sub-projects. When a dependency is built, it produces .d.ts files. Consuming projects read these small declaration files instead of re-parsing source code, drastically reducing memory usage and build times[cite: 1].