jsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "noImplicitAny": true,
    "removeComments": true,
    "strictNullChecks": true,
    "sourceMap": false,
    "resolveJsonModule": true,
    "lib": ["es5", "es2015.promise", "dom", "es2015"],
    "checkJs": true
  }
}