yarnpkg/berry — reverse-engineered prompt

Build me a modern package manager for JavaScript projects that feels fast, reliable, and safe to use in real teams. I want a command line tool that can install and manage dependencies, work well for single apps and multi package workspaces, and make monorepos feel like a first class use case. It should support plugins so extra features can be added without changing the core, and package scripts should run consistently across Windows, macOS, and Linux through a portable shell style layer. Please make it Node friendly first, but structured so plugins could support other ecosystems later. I also want the core exposed as a clean programmatic API, not just a CLI, and the whole project should be written in TypeScript with solid tests and docs. Try to make the developer experience polished, with sensible defaults, clear errors, and behavior people could trust for everyday use. Look up current docs online if you need to.