tsconfig.json

{
  "compilerOptions": {
    "target": "ES2015", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
    // "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    "sourceMap": true, /* Generates corresponding '.map' file. */
    "outDir": "./dist", /* Redirect output structure to the directory. */
    "esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    "declaration": true,
    "allowJs": false,
    "experimentalDecorators": true
    // "skipLibCheck": true,                     /* Skip type checking of declaration files. */
    // "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
  },
  "include": [
    "src"
  ]
}