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",

    /* Linting */
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,
    // typechecking for jest matchers expect().toBeInTheDocument() fails without including @testing-library/jest-dom here
    // TODO: move this to a tsconfig.test.json file so that we only load these types for compiling tests
    "types": ["@testing-library/jest-dom"]
  },
  "include": ["src", "test-setup.ts"]
}