It seems like you're referring to "Monorepo.js." However, I couldn't find any specific information about a library or tool called "Monorepo.js" in my training data up until September 2021.
A monorepo is a software development approach where multiple projects or components are stored in a single repository. This allows for shared code, easier dependency management, and streamlined development processes. There are various tools and frameworks available to facilitate working with monorepos, such as Lerna, Yarn Workspaces, and Nx.
If "Monorepo.js" is a specific library or tool that has been released after my knowledge cutoff date, I apologize for not being aware of it. Could you provide more context or details about what "Monorepo.js" is or what you are looking for?