tsconfig.json

// https://www.typescriptlang.org/docs/handbook/compiler-options.html
{
  "compilerOptions": {
    "target": "es5",
    "lib": [
      "es6",
      "dom"
    ],
    "sourceMap": true,
    "moduleResolution": "node"
  },
  "files": [
    "./src/lib/index.ts"
  ]
}