The article serves as a comprehensive guide to setting up a monorepo using Yarn and Vite, aimed at streamlining the development of JavaScript and TypeScript applications by utilizing Vite's fast development server and hot module replacement (HMR) capabilities. It details the creation of a monorepo structure that accommodates multiple subprojects, including React and Vue apps, and a shared library, demonstrating how Yarn workspaces can efficiently manage dependencies and enable parallel builds. The article explains the use of Vite's native ECMAScript module capabilities to improve development efficiency and describes the execution of global scripts for streamlined operation across the monorepo. It also highlights how Earthly, a build tool for monorepos, can further enhance development and build times when Yarn and Vite's limitations are reached, particularly when incorporating backend languages.