TypeScript Monorepos with Yarn

The text provides a detailed guide on setting up a continuous integration (CI) pipeline for TypeScript projects using Yarn Workspaces and Semaphore, focusing on building and testing at scale. It explains how TypeScript extends JavaScript with added complexity due to the need for compilation, and illustrates the setup process using a monorepo containing two packages, 'shared' and 'sayhi'. The guide covers configuring Yarn Workspaces, linking TypeScript packages using project references, and implementing a change-based CI pipeline with Semaphore that optimizes build processes by executing only the blocks related to modified packages. The article highlights the benefits of using TypeScript for better code readability and fewer errors, and concludes with insights into managing dependencies and running workflows for efficient and scalable development.