Hydra is attacking porcupine? Well, actually not. Because Hydra is Lerna.js and porcupine is a SharePoint Framework solution with library components. Most likely you've heard about SharePoint Framework and library component, but not about Lerna. Lerna is
Lerna is a tool that optimizes the workflow around managing multi-package repositories with git and npm.
Now it becomes a little bit clear what is Lerna. However, how does it correlate with SharePoint Framework and library components?
Actually, you're not limited in using Lerna with library components only. If you have a few separate SharePoint Framework solutions in one git repository, you can add Lerna to simplify package management. More...