tsconfig.json

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

    "allowSyntheticDefaultImports": true,
    // Ensure that .d.ts files are created by tsc, but not .js files
    "declaration": true,
    "emitDeclarationOnly": true,

    /* Bundler mode */
    "moduleResolution": "node",
    "allowImportingTsExtensions": true,
    /* Advanced Options */
    "resolveJsonModule": true /* Include modules imported with '.json' extension */,
    // Ensure that Babel can safely transpile files in the TypeScript project
    "isolatedModules": true,
    //"noEmit": true,
    "jsx": "react-jsx",

    /* Linting */
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true
  },
  "include": ["src", "__test__/ctx.test.js", "__test__/stringToReact.test.js", "__test__/mock-module.js"],
  "exclude": ["node_modules"]
}