rollup.config.js

import dts from "rollup-plugin-dts";
import resolve from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import json from "@rollup/plugin-json";
import alias from "@rollup/plugin-alias";
import esbuild from "rollup-plugin-esbuild";
import typescript from "rollup-plugin-typescript2";
import babel from "@rollup/plugin-babel";

const entries = ["src/index.ts"];

const plugins = [
  babel({
    babelrc: false,
    babelHelpers: "bundled",
    // presets: [["env", { modules: false }]],
  }),
  resolve({
    preferBuiltins: true,
  }),
  alias(),
  json(),
  typescript(),
  commonjs(),
  esbuild(),
];

export default [
  ...entries.map((input) => ({
    input,
    output: [
      {
        file: input.replace("src/", "dist/").replace(".ts", ".js"),
        format: "esm",
      },
      // {
      //   file: input.replace("src/", "dist/").replace(".ts", ".cjs"),
      //   format: "cjs",
      // },
    ],
    external: [],
    plugins,
  })),
  ...entries.map((input) => ({
    input,
    output: {
      file: input.replace("src/", "").replace(".ts", ".d.ts"),
      format: "esm",
    },
    external: [],
    plugins: [dts({ respectExternal: true })],
  })),
];