tsconfig.json

{
  "compilerOptions": {
    "outDir": "dist",
    "module": "commonjs",
    "target": "es5",
    "declaration": true,
    "lib": ["es2015"],
    "sourceMap": true,
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": false,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": false
  },
  "include": ["lib/**/*"],
  "exclude": ["node_modules"]
}