Awesome Monorepo

A curated list of awesome Monorepo tools, software and architectures. Monorepos, short for mono-repositories, are repositories that contain multiple projects, usually related to each other.

Inspired by https://github.com/vinta/awesome-python.

Contents

• Build systems & dependency management tools
• Repository management tools
• Good reads
• Version control systems & add-ons
  • Git
  • Mercurial
• Development process tools
• Notable public monorepos
• Migration tools

Build systems & dependency management tools

• Bazel is Google's monorepo-oriented build system. More on Bazel: awesome-bazel
• Buck is Facebook's monorepo-oriented build system.
• Pants is a monorepo-oriented build system, used by Twitter, Foursquare and multiple other companies.
• Yarn is a JavaScript dependency management tool that supports monorepos through workspaces.
• Lerna is a tool for managing JavaScript projects with multiple packages, built on Yarn.
• OAO is a Yarn-based, opinionated JavaScript monorepo management tool.
• MBT is a build tool with differential build support.
• Symplify\Monorepo is a PHP monorepo management tool.

Repository management tools

• oao
• FBShipIt
• Syncpack allows managing multiple package.json files in Lerna Monorepos.
• wsrun allows running a command in each package of a Yarn workspaces monorepo.

Good reads

• gomonorepo covers tooling and concepts of monorepos, centered around PHP.
• Why Google Stores Billions of Lines of Code in a Single Repository

Version control systems & add-ons

Git

Tools

• Git shallow clones let you clone only part of your Git history.
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• Git filter-branch let you rewrite a repository's history and prune branches.
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• Git clone --single-branch
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• Git sparse-checkout
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• Git LFS improves the handling of large files in Git.
• GVFS virtualizes the file system beneath your git repo so that git and all tools see what appears to be a normal repo, but GVFS only downloads objects as they are needed. Windows only.
• SlothFS is similar to GVFS, but read-only. It works on Linux and OSX.
• git subtree merges and splits subtrees from your project into subprojects and back.
  • git subsplit automates and simplifies the process of managing one-way read-only subtree splits.

Scaling info

• Atlassian's Monorepos in Git and How to handle big repositories in Git cover scaling options for Git.

Mercurial

Tools

• hgwatchman and Watchman, replaced by fsmonitor trigger partial, incremental builds when your files change
• Facebook's hg-experimental extensions include better support for large repositories in Hg.

Scaling info

• Scaling Mercurial at Facebook

Development process tools

Code reviews

• Pull Review Hubot plugin to automate pull reviews with lots of configuration options.
• Rietveld is a code review tool by Google used by Chromium.

CI tools

• Incremental CI in Jenkins with Bazel, article by Kristina Chodorow (Bazel team).
• bazel-travis is a minimal setup to use Travis CI in a Bazel monorepo.
• buildpipe is a tool to dynamically generate Buildkite pipelines by looking at changes in projects.

Code ownership

• Github's CODEOWNERS can restrict who can approve a pull request that affects a given part of a monorepo.
• Chromium's OWNERS file inspired Github's CODEOWNERS.

Notable public monorepos

• Foursquare's opensource projects
• Stellar's Go monorepo
• Habitat's monorepo
• startup-os monorepo: working examples for Google's Open Source tools (bazel, etc) in a monorepo
• Entria's Full Stack Playground Monorepo

Migration tools

• Bazel's migration-tooling repository.
• Gazelle generates Bazel BUILD files automatically for Go packages.
• tomono imports an existing set of Git repositories into a monorepo.
• shopsys/monorepo-tools contains a set of tools for building and splitting a monolithic repository.

License

To the extent possible under law, Uriel Corfa has waived all copyright and related or neighboring rights to this work.