tsconfig.json

{
    "compilerOptions": {
        "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
        "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
        "outDir": "./lib" /* Redirect output structure to the directory. */,
        "rootDir": "./src" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
        "strict": true /* Enable all strict type-checking options. */,
        "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */,
        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
        "noUnusedLocals": true,
        "allowSyntheticDefaultImports": true,
        "isolatedModules": true
    },
    "exclude": ["node_modules", "**/*.test.ts"]
}