tsconfig.json

{
  "compilerOptions": {
    "target": "es2016",                      /* 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'. */
    "sourceMap": false,                       /* Generates corresponding '.map' file. */
    "inlineSourceMap": true,
    "outDir": "lib",                         /* 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). */
    "rootDirs": ["src"],                     /* List of root folders whose combined content represents the structure of the project at runtime. */
    "declaration": true,
    "typeRoots": [
      "node_modules/@types"
    ]
  },
  "exclude": [
    "lib",
    "node_modules"
  ]
}