tsconfig.json

{
    "compilerOptions": {
        "esModuleInterop": true,
        "baseUrl": "./",
        "outDir": "./lib/",
        "sourceMap": true,
        "strict": true,
        "resolveJsonModule": true,
        "moduleResolution": "node",
        "experimentalDecorators": true,
        "lib": ["es5", "es2015", "es2016", "es2017", "dom"],
        "allowSyntheticDefaultImports": true,
        "types": [
            // add node as an option
            "node"
        ],
        "module": "commonjs",
        "target": "es2017",
        "noImplicitReturns": true,
        "noImplicitThis": true,
        "noImplicitAny": false,
        "strictNullChecks": false,
        "suppressImplicitAnyIndexErrors": true,
        "noUnusedLocals": false,
        "skipLibCheck": true
    },
    "include": [
        "./src/**/**/**/*"
    ],
    "exclude": [
        "node_modules",
        "**/*.spec.ts"
    ]
}