rollup.config.js

import commonjs from "@rollup/plugin-commonjs";
import resolve from "@rollup/plugin-node-resolve";
import typescript2 from "rollup-plugin-typescript2";
import pkg from "./package.json";
import { builtinModules } from "module";
import analyze from "rollup-plugin-analyzer";

const generalConfig = (moduleSystem) => ({
  input: "src/index.ts",
  output: {
    dir: `dist/${moduleSystem}`,
    format: `${moduleSystem}`,
    sourcemap: true,
  },
  external: [
    // ...Object.keys(pkg.dependencies),
    ...Object.keys(pkg.peerDependencies),
    ...Object.keys(pkg.optionalDependencies),
    ...builtinModules,
  ],
  plugins: [
    commonjs(),
    resolve(),
    typescript2({
      rootDir: ".",
      tsconfig: `tsconfig.es.json`,
      typescript: require("ttypescript"),
      declaration: moduleSystem === "es" ? true : false,
    }),
    ...(moduleSystem === "es" ? [analyze()] : []),
  ],
});

export default [generalConfig("cjs"), generalConfig("es")];