tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "ES6",
    "module": "commonjs",
    "allowJs": true,
    "resolveJsonModule": true,
    "jsx": "react",
    "noEmit": true,
    "skipLibCheck": true,
    /* Strict Type-Checking Options */
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "suppressImplicitAnyIndexErrors": true,
    /* Additional Checks */
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    /* Module Resolution Options */
    "moduleResolution": "node",
    "baseUrl": ".",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true
  },
  "exclude": [
    "app/__tests__/" // exclude test files
  ]
}