tsconfig.json

{
  "compilerOptions": {
    "target": "es2015",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
    "module": "es2020",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    "strict": true,                           /* Enable all strict type-checking options. */
    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    "forceConsistentCasingInFileNames": true,  /* Disallow inconsistently-cased references to the same file. */
    "outDir": "./lib",
    "declaration": true,
    "moduleResolution": "node",
    "resolveJsonModule": true
  },
  "ts-node": {
    // these options are overrides used only by ts-node
    "compilerOptions": {
      "module": "commonjs"
    }
  },
  "include": [
    "./src/**/*"
  ],
  "exclude": [
    "src/__test__",
    "src/scripts"
  ]
}