Reclaim space from node_modules, target and other developer folders

What is safe to delete

• node_modules: restored by npm install, pnpm install or yarn.
• Rust target: rebuilt by cargo build.
• Python virtual environments (.venv, venv): recreated from requirements or a lock file.
• .NET bin and obj: rebuilt by dotnet build.
• Gradle build and .gradle folders, Flutter build, Next.js .next.
• Unity Library and Unreal Intermediate and Saved folders.

Clear the shared caches with their own commands

Package managers keep a global cache too. Clean it with the official command so the tool stays consistent:

npm cache clean --force
pnpm store prune
cargo cache --autoclean   # needs cargo-cache
pip cache purge

Leave active projects alone

Deleting dependencies on a project you work on daily only costs you a reinstall. Focus on projects you have not touched in a month or more.