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Turborepo Monorepo Architecture

Turborepo monorepo structure with shared packages, task pipelines, remote caching, and parallel execution for multi-app projects.

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Turborepo Monorepo Architecture

Turborepo is a high-performance build system for JavaScript and TypeScript monorepos. It leverages task pipelines, content-aware hashing, and remote caching to dramatically speed up builds across multi-app projects.

Pipelines

In turbo.json, you define a pipeline that declares relationships between tasks. Turborepo uses this graph to determine what can run in parallel and what must wait.

{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", ".next/**"]
    },
    "test": {
      "dependsOn": ["build"]
    },
    "lint": {}
  }
}
  • "^build" means “run build in all dependencies first.”
  • lint has no dependencies, so it runs immediately in parallel with everything else.
  • test waits for build to finish.

Content-Aware Caching

Turborepo hashes the inputs of every task (source files, environment variables, dependent outputs) and stores the result. If inputs haven’t changed, it replays the cached output instantly — even across CI runs with Remote Caching via Vercel.

Workspaces

Turborepo works on top of your package manager’s workspace feature (npm, pnpm, yarn, or bun). Shared packages in packages/ are consumed by apps in apps/ via standard workspace dependencies.

Key Concepts

  • Task Graph: Turborepo builds a directed acyclic graph of tasks and runs them in the optimal order.
  • Pruned Subsets: turbo prune --scope=web creates a sparse monorepo with only the packages needed for a given app — perfect for Docker builds.
  • Remote Caching: Share cache artifacts across your entire team and CI. A cache hit means zero re-computation.
  • Parallel Execution: Independent tasks run simultaneously, using all available CPU cores.

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