tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "strictNullChecks": true,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "removeComments": true,
    "preserveConstEnums": true,
    "sourceMap": true,
    "declaration": true,
    "target": "es5",
    "lib": ["es2015"], // Without this, an error occurs: TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option.
    "outDir": "dist",
    "rootDir": "./"
  },
  "include": [
    "src/**/*",
    "test/**/*"
  ],
  "exclude": [
    "node_modules/*"
  ]
}