rollup.config.js

import path from "path";
import resolve from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import terser from "@rollup/plugin-terser";
import { babel } from "@rollup/plugin-babel";
import replace from "@rollup/plugin-replace";
import pkg from "./package.json";

const isProduction = process.env.NODE_ENV == "prod";

function createConfig() {
  return {
    input: path.resolve(__dirname, "src/index.ts"),
    output: [
      {
        file: pkg.main,
        format: "cjs",
      },
      {
        file: pkg.module,
        format: "es",
      },
    ],
    plugins: [
      resolve({
        browser: false,
        extensions: [".ts", ".js"],
      }),
      commonjs(),
      replace({
        "process.env.NODE_ENV": process.env.NODE_ENV,
        preventAssignment: true,
      }),
      babel({
        include: ["src/**/*"],
        extensions: [".js", ".ts"],
        babelHelpers: "bundled",
      }),
      isProduction && terser(),
    ],
  };
}

export default createConfig();