: Enforce acyclic dependency rules. Use tools like depcruise (JS) or modgraph (Go) to visualize and block dependency cycles. Pitfall 3: Neglecting Developer Experience If every change across three modules in a modrepo requires rebuilding all three from source on every CI run, developers will lose patience.
// package.json at root of modrepo
| Feature | Monorepo | | Multirepo | |---------|----------|-------------|-----------| | Scope | Entire company codebase | Single bounded context (e.g., team domain) | Per component/service | | Code sharing | Trivial (everything visible) | Controlled via internal packages | Requires package registry | | Build time | Often slow, requires caching | Fast, parallel by design | Usually fast but fragmented | | Access control | Coarse (folder-level) | Fine-grained (repo-level) | Perfect isolation | | Tooling complexity | High (Bazel, Nix, Turborepo) | Medium (standard tools suffice) | Low (but coordination is hard) | | Cross-repo changes | Atomic | Atomic within the modrepo | Requires multiple PRs | modrepo