tsconfig.json

{
  "compileOnSave": true,
  "compilerOptions": {
    "allowUnreachableCode": false,
    "alwaysStrict": true,
    "baseUrl": ".",
    "declaration": true,
    "declarationDir": "./types",
    "downlevelIteration": true,
    "forceConsistentCasingInFileNames": true,
    "lib": [
      "es2017",
      "dom",
      "dom.iterable"
    ],
    "module": "commonjs",
    "moduleResolution": "node",
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noUnusedParameters": true,
    "outDir": "dist",
    "sourceMap": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "target": "es2015",
    "typeRoots": [
      "./node_modules/@types"
    ]
  },
  "exclude": [
    "node_modules"
  ],
  "include": [
    "src/**/*"
  ]
}