tsconfig.json

{
  "compilerOptions": {
    "target": "esnext",                          /* 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'. */
    // "lib": [],
    "strictNullChecks": true,
    "downlevelIteration": true,
    "sourceMap": true,                     /* Generates corresponding '.map' file. */
     "outDir": "dist/",                        /* Redirect output structure to the directory. */
     "strict": true,                           /* Enable all strict type-checking options. */
     "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
      "types": [
        "reflect-metadata"
      ],                           /* Type declaration files to be included in compilation. */
      "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
       "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
       "emitDecoratorMetadata": true         /* Enables experimental support for emitting type metadata for decorators. */
  },
  "exclude": ["node_modules"]
}