tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "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": [                                  /* Specify library files to be included in the compilation. */
      "es5", "es2015", "es2016", "es2017"
    ],
    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    "outDir": "./build",                      /* Redirect output structure to the directory. */

    /* Strict Type-Checking Options */
    // "strict": true,                            /* Enable all strict type-checking options. */

    /* Module Resolution Options */
    "baseUrl": "./",                          /* Base directory to resolve non-absolute module names. */
    "paths": {                                 /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
      "*": ["./types/*"]
    },
    "esModuleInterop": true
  }
}