tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "esnext",
    "moduleResolution": "node",
    "lib": ["es2015"],

    "rootDir": "src",
    "outDir": "dist",

    "strict": true,
    "alwaysStrict": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "esModuleInterop": true,

    "forceConsistentCasingInFileNames": true,
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noFallthroughCasesInSwitch": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,

    "declaration": true,

    "pretty": true
  },
  "include": ["src/**/*"]
}