tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
    "module": "commonjs",                     /* Specify module code generation: 'none', commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    "lib": [
      "es5",
      "es2015",
      "dom",
      "scripthost"
    ],

    /* Build source files into a folder called `dist` to maintain clean directories, free of ts-generated files */
    "outDir": "./dist",

    /* Specify library files to be included in the compilation:  */
    "declaration": true,                   /* Generates corresponding '.d.ts' file. */
    "sourceMap": true,                     /* Generates corresponding '.map' file. */

    /* Strict Type-Checking Options */
    "alwaysStrict": true,                   /* Parse in strict mode and emit "use strict" for each source file. */

    /* Module Resolution Options */
    "moduleResolution": "node",               /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    "types": ["node"], /* Type declaration files to be included in compilation. */
  }
}