tsconfig.json

{
  "compilerOptions": {
    "outDir": "lib",
    "sourceMap": true,
    "noImplicitAny": true,
    "removeComments": true,
    "module": "commonjs",
    "target": "es5",
    "lib": ["es7", "dom"],
    "moduleResolution": "node",
    "rootDir": "src",
    "forceConsistentCasingInFileNames": true,
    "noImplicitReturns": false,
    "noImplicitThis": true,
    "noStrictGenericChecks": false,
    "esModuleInterop": true,
    "resolveJsonModule": true,
    "strictNullChecks": true,
    "strict": true,
    "suppressImplicitAnyIndexErrors": false,
    "noUnusedLocals": false,
    "declaration": true,
    "typeRoots": ["typings", "node_modules/@types"]
  },
  "include": ["src/**/*", "index.ts"],
  "exclude": ["node_modules", "dist", "**/*.spec.ts"]
}