tsconfig.json

{
  "compilerOptions": {
      /* Basic Options */
      "target": "es6", /* 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'. */
      "declaration": true, /* Generates corresponding '.d.ts' file. */
      "outDir": "./dist", /* Redirect output structure to the directory. */
      "rootDir": ".", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
      /* Strict Type-Checking Options */
      "strict": true, /* Enable all strict type-checking options. */
      "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
      "strictNullChecks": true, /* Enable strict null checks. */
      "strictFunctionTypes": true, /* Enable strict checking of function types. */
      /* Additional Checks */
      "noUnusedLocals": true, /* Report errors on unused locals. */
      "moduleResolution": "node",
      "typeRoots": [
          "node_modules/@types"
      ], /* List of folders to include type definitions from. */
      "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
      "emitDecoratorMetadata": true /* Enables experimental support for emitting type metadata for decorators. */
  },
  "exclude": [
      "node_modules",
      "test"
  ]
}