tsconfig.json

{
    "compilerOptions": {
        "target": "es6",
        "module": "commonjs",
        "moduleResolution": "node",
        "strictNullChecks": true,
        "removeComments": false,
        "sourceMap": true,
        "declaration": true,
        "noEmitOnError": true,
        "noUnusedLocals": true,
        "noImplicitThis": true,
        "noImplicitAny": true,
        "noFallthroughCasesInSwitch": true,
        "lib": ["es5", "es2015.core", "es2015.promise", "es2015.collection", "es2015.iterable"]
    }
}