rollup.config.ts

import resolve from "@rollup/plugin-node-resolve";
import commonjs from "rollup-plugin-commonjs";
import sourceMaps from "rollup-plugin-sourcemaps";
import camelCase from "lodash.camelcase";
import typescript from "rollup-plugin-typescript2";
import json from "@rollup/plugin-json";
import { terser } from "rollup-plugin-terser";

const pkg = require("./package.json");

const libraryName = "fromfrom";

export default {
  input: `src/${libraryName}.ts`,
  output: [
    {
      file: pkg.main,
      name: camelCase(libraryName),
      format: "umd",
      sourcemap: true,
    },
    {
      file: "dist/fromfrom.umd.min.js",
      name: "fromfrom",
      format: "umd",
      sourcemap: true,
      plugins: [terser()],
    },
    { file: pkg.module, format: "es", sourcemap: true },
    {
      file: "dist/fromfrom.es5.min.js",
      format: "es",
      sourcemap: true,
      plugins: [terser()],
    },
  ],
  // Indicate here external modules you don't wanna include in your bundle (i.e.: 'lodash')
  external: [],
  watch: {
    include: "src/**",
  },
  plugins: [
    // Allow json resolution
    json(),
    // Compile TypeScript files
    typescript({ useTsconfigDeclarationDir: true }),
    // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
    commonjs(),
    // Allow node_modules resolution, so you can use 'external' to control
    // which external modules to include in the bundle
    // https://github.com/rollup/rollup-plugin-node-resolve#usage
    resolve(),
    // Resolve source maps to the original source
    sourceMaps(),
  ],
};