Yarn is a JavaScript package manager that also gives developers a project management toolset and a zero-install deployment solution. Heroku supports Yarn 2, 3, and 4, so developers are able to take advantage of zero-installs during their Node.js builds. We’ll go over a popular use case for Yarn that was enhanced by Yarn 2 and later releases: using workspaces to manage dependencies for a monolithic repository, also known as a multi-package repository or a monorepo.

Our Yarn Workspaces tutorial will cover Yarn monorepo setup and how to take advantage of Yarn’s cache to manage monorepo dependencies. Prerequisites for this include a development environment with Node installed. To follow...