rollup.config.js

import typescript from "rollup-plugin-typescript2";
import { uglify } from "rollup-plugin-uglify";
import dts from "rollup-plugin-dts";
import { nodeResolve } from "@rollup/plugin-node-resolve";
import json from "@rollup/plugin-json";

const uglifyOptions = {
   sourcemap: true,
};

export default [
   {
      input: "src/index.ts",
      output: [
         {
            name: "MusicTheory",
            file: "dist/musictheory.js",
            format: "umd",
         },
      ],
      plugins: [typescript(), nodeResolve(), json()],
   },

   {
      input: "src/index.ts",
      output: [
         {
            name: "MusicTheory",
            file: "dist/musictheory.min.js",
            format: "umd",
         },
      ],
      plugins: [typescript(), nodeResolve(), json(), uglify(uglifyOptions)],
   },

   {
      input: "dist/index.d.ts",
      output: [
         {
            file: "dist/musictheory.d.ts",
            format: "umd",
         },
      ],
      plugins: [dts()],
   },
];