tsconfig.build.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "target": "es2016" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
    "lib": [
      "es5",
      "es6"
    ] /* Specify a set of bundled library declaration files that describe the target runtime environment. */,

    "module": "esnext" /* Specify what module code is generated. */,
    "rootDir": "./src" /* Specify the root folder within your source files. */,
    "moduleResolution": "node" /* Specify how TypeScript looks up a file from a given module specifier. */,
    "baseUrl": "./" /* Specify the base directory to resolve non-relative module names. */,
    "declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
    "sourceMap": true /* Create source map files for emitted JavaScript files. */,
    "outDir": "dist" /* Specify an output folder for all emitted files. */,
    "removeComments": false /* Disable emitting comments. */
  },
  "exclude": ["node_modules"],
  "files": ["src/index.ts"]
}