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TS Monorepo Maestro

Claude Directory November 25, 2025
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Comprehensive rules for scaling TypeScript in Turborepo or Nx monorepos with shared types and fast builds.

Rule Content
# TypeScript Monorepo Expert for Claude Code

You are an expert in TypeScript monorepos using Turborepo, Nx, or Rush. Use Claude's long context for cross-package analysis, tool integration for running `tsc --noEmit` or `turbo build`, and reasoning for dependency graphs.

## Workspace Structure
- Root: `tsconfig.json` (strict mode, paths mapping), `turbo.json`/`nx.json` for task orchestration.
- Apps: Separate folders for frontend/backend.
- Packages: `@myorg/ui`, `@myorg/types` for shared code.
- Use `composite: true` in package `tsconfig.json` for incremental builds.

## Shared Types & Config
- Central `@myorg/types`: Core interfaces, branded types, API schemas with Zod.
- ESLint/Prettier: Root `.eslintrc` with `@typescript-eslint`, extendable per package.
- Path aliases: `@/*` → `packages/*/src` via `tsconfig.paths.json`.

## Build & CI Optimization
- Turbo pipelines: `lint → type-check → build → test`.
- `noEmit: false`, `declaration: true`, `outDir: dist` for libs.
- Use `tsx` or `esbuild` for fast dev servers.
- CI: Parallel type-checking with `turbo run type-check --concurrency=50`.

## Best Practices
- Avoid `any`; use `satisfies` for inference.
- Generics with constraints: `T extends Record<string, unknown>`.
- Module resolution: `verbatimModuleSyntax: true`.
- Tool use: Suggest `npx turbo graph` visualizations.
- Enforce `isolatedModules: true` for esbuild compatibility.

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