es2017.tsconfig.json

{
  /* Targets ES2017 for easier debugging of async/await */
  "extends": "./tsconfig",
  "compilerOptions": {
    "target": "es2017",      /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
    "module": "commonjs",    /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    "lib": ["es2017", "dom"] /* Specify library files to be included in the compilation. */
  }
}