@repo/typescript-config

@repo/typescript-config provides shared tsconfig base files used across the monorepo. It ensures consistent TypeScript compiler options for all packages and apps.

Available Configs

base.json

The foundational TypeScript configuration all other configs extend:

{
  "compilerOptions": {
    "declaration": true,
    "declarationMap": true,
    "esModuleInterop": true,
    "incremental": false,
    "isolatedModules": true,
    "lib": ["es2022", "DOM", "DOM.Iterable"],
    "module": "NodeNext",
    "moduleDetection": "force",
    "moduleResolution": "NodeNext",
    "noUncheckedIndexedAccess": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "strict": true,
    "target": "ES2022"
  }
}

Key features:

• Strict mode enabled — catches more type errors at compile time
• noUncheckedIndexedAccess — Adds undefined to index signatures, preventing common runtime errors
• isolatedModules — Required for Vite/esbuild compatibility
• ES2022 target — Modern JavaScript output
• NodeNext module resolution — Full ESM support with .js extensions

preact-library.json

Extends base.json with Preact-specific JSX settings:

{
  "extends": "./base.json",
  "compilerOptions": {
    "jsx": "react-jsx",
    "jsxImportSource": "preact",
    "types": ["node"],
    "skipLibCheck": true
  }
}

This configures TypeScript to use Preact's JSX factory instead of React's.

Usage

Reference the shared config in your app's tsconfig.json:

{
  "extends": "@repo/typescript-config/preact-library.json",
  "compilerOptions": {
    "paths": {
      "react": ["./node_modules/preact/compat/"],
      "react-dom": ["./node_modules/preact/compat/"]
    }
  },
  "include": ["src"]
}

The paths mapping ensures that any imports of react or react-dom (commonly used by third-party libraries) are redirected to preact/compat.