32 years in the dev trenches. Here I write what I learned, what I broke, and what nobody tells you in the tutorials.
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I used all four in real projects. One wrecked a monorepo at 3am. Another saved my ass in production. Here's the unfiltered truth about every major package manager in 2025.
I ran all three package managers on the same Next.js 16 + strict TypeScript monorepo with Shadcn/ui and Radix UI. pnpm wins on disk and CI — but there's a real compatibility cost the migration guides never tell you about.
I ran supply chain attack simulations on npm and PyPI separately. When I put them side by side, the pattern that emerged made me uncomfortable: the ecosystem everyone watches isn't the most vulnerable one. Here's the cross-meta-analysis with real numbers.
npm audit tells you you're safe. I stress-tested that claim with real methodology against my production dependencies and found three attack vectors the scanner doesn't even register. The Node ecosystem has a structural problem that green badges keep hidden.
Spotify's "human artist" badge hit 243 points on HN. This isn't a music industry problem. It's a leading indicator. If music already needs to prove a human made it, code and posts are next — and nobody has the stack to handle it yet.
Checkmarx detected a supply chain attack targeting the Bitwarden CLI ecosystem. I use that tool in production. This isn't a Bitwarden problem — it's a problem with how any dev builds their trust surface without even realizing it.