what is turborepo fr?

Turborepo is a build system designed specifically for JavaScript and TypeScript projects, with a focus on speed. It is written in Rust, a systems programming language known for performance, which helps it run build tasks much faster than traditional approaches. The core problem it solves is the slowness of building large codebases, especially those organized as a monorepo, a single repository that contains multiple related packages or apps at once. Rather than rebuilding everything from scratch every time, Turborepo understands which parts of the code have changed and only rebuilds what is necessary. It also runs tasks in parallel where possible, so build steps that don't depend on each other can happen simultaneously instead of one after another. A developer would reach for Turborepo when they maintain a codebase that has grown large enough that builds feel sluggish, or when they are managing several JavaScript or TypeScript packages together in one repository and want their test, lint, and build scripts to run efficiently. It slots in alongside existing tools rather than replacing them, you keep your existing scripts and just let Turborepo coordinate and accelerate them.