How to fix package-lock.json merge conflicts (and yarn.lock, poetry.lock, go.sum) the right way

Never hand-edit a conflicted lockfile, and never click "Accept Both". Resolve the manifest, then let the package manager regenerate the lock. Here is the exact command for npm, Yarn, pnpm, Poetry, uv, Cargo, Go, Composer, Bundler and Pipenv, why each one is different, and LockSettle, a free VS Code extension that runs the right one for you.