tsconfig.json

{
  "compilerOptions": {
    /* Language / environment — modern browsers + React 18/19. */
    "target": "ES2020",
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "jsx": "react-jsx",
    "useDefineForClassFields": true,

    /* Module system — bundler resolves, the bundler emits. */
    "module": "ESNext",
    "moduleResolution": "Bundler",
    "moduleDetection": "force",
    "isolatedModules": true,
    "verbatimModuleSyntax": true,
    "esModuleInterop": true,
    "resolveJsonModule": true,

    /* Library output — declarations are emitted by the build config. */
    "declaration": true,
    "declarationMap": true,
    "sourceMap": true,
    "noEmit": true,

    /* Strictness. */
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,
    "forceConsistentCasingInFileNames": true,
    "skipLibCheck": true
  },
  "include": ["src"]
}