Buck2 vs Turborepo

Buck2 is a free build system from Meta for large-scale repositories that combine multiple programming languages. It uses Starlark rules, a dynamic dependency graph, and incremental actions to support extensible builds. Its language table lists prelude rules for C/C++, Erlang, Go, Haskell, Java, Kotlin, OCaml, Python, and Rust, though usability varies by language. Build actions can run remotely through services exposing Bazel's remote execution API; the project lists BuildBarn, BuildBuddy, EngFlow, and NativeLink as compatible with its distributed compilation support. Buck2 supports filesystem watching and can integrate with Meta's optional Eden virtual filesystem. Rules are hermetic by default and missing dependencies are errors, but local-only build steps are not sandboxed. The project describes Buck2 as early-stage and says it has no stable release tag; its latest binary tag changes with repository pushes. It warns that outside users may encounter rough edges, missing features, and missing toolchains. Source and binaries are available under MIT and Apache-2.0 licenses. The project directs users to GitHub for issue reports and offers a community Discord server.

Turborepo is a build system for JavaScript and TypeScript codebases, including monorepos and single-package workspaces. It organizes tasks into a graph and runs them in parallel across available cores. Task outputs and logs can be cached locally, while Remote Caching allows cache artifacts to be shared across machines. Vercel Remote Cache is free on all Vercel plans, including for teams that do not host applications on Vercel; teams can also self-host a remote cache using an HTTP server that implements the Remote Caching API. Remote artifacts can be signed with HMAC-SHA256 and checked when downloaded. The CLI is generally supported on Debian-based Linux, macOS, and Windows for x86_64 and ARM64. Stable package-manager support includes pnpm 8+, npm 8+, Yarn 1+ including Plug’n’Play, and Bun 1.2+. CI guides cover Vercel, GitHub Actions, CircleCI, GitLab CI, Travis CI, and Buildkite. Turborepo is free. To cache task files, outputs must be declared in configuration. Individuals can seek free help in GitHub Discussions or Vercel Community; companies can contact Vercel about paid support.