tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "useDefineForClassFields": true,
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "skipLibCheck": true,

    /* Bundler mode */
    "moduleResolution": "bundler",
    "allowImportingTsExtensions": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx",

    /* Strictness */
    "strict": false,
    "noImplicitAny": false,
    "strictPropertyInitialization": false,
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    "noFallthroughCasesInSwitch": true,

    /* Keep type-check focused on the TypeScript migration surface. */
    "allowJs": false,
    "checkJs": false
  },
  "include": [
    "src/**/*.d.ts",
    "src/**/*.ts",
    "src/**/*.tsx"
  ]
}