tsconfig.json

{
    "compilerOptions": {
        /* Language and Environment */
        "target": "es6" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
        "lib": ["es2020", "dom"] /* Specify a set of bundled library declaration files that describe the target runtime environment. */,

        /* Modules */
        "module": "CommonJS" /* Specify what module code is generated. */,

        "resolveJsonModule": true,
        /* Emit */
        "declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
        "declarationMap": true /* Create sourcemaps for d.ts files. */,
        "sourceMap": true /* Create source map files for emitted JavaScript files. */,
        "rootDirs": ["./src", "src/__test__"] /* Specify the root folder within your source files. */,
        "outDir": "dist" /* Specify an output folder for all emitted files. */,

        /* Interop Constraints */
        // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
        // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
        "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */,
        "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,

        /* Type Checking */
        "strict": true /* Enable all strict type-checking options. */,
        "strictNullChecks": true /* When type checking, take into account `null` and `undefined`. */,

        /* Completeness */
        "skipDefaultLibCheck": true /* Skip type checking .d.ts files that are included with TypeScript. */,
        "skipLibCheck": true /* Skip type checking all .d.ts files. */
    },
    "include": ["src"],
    "exclude": ["node_modules", "dist", "src/__tests__/"]
}