esp-web-tools/rollup.config.js

import { nodeResolve } from "@rollup/plugin-node-resolve";
import json from "@rollup/plugin-json";
import { terser } from "rollup-plugin-terser";
import { babel } from "@rollup/plugin-babel";

const config = {
  input: "dist/install-button.js",
  output: {
    dir: "dist/web",
    format: "module",
  },
  external: ["https://www.improv-wifi.com/sdk-js/launch-button.js"],
  preserveEntrySignatures: false,
  plugins: [
    nodeResolve(),
    babel({
      babelHelpers: "bundled",
      plugins: ["@babel/plugin-proposal-class-properties"],
    }),
    json(),
  ],
};

if (process.env.NODE_ENV === "production") {
  config.plugins.push(
    terser({
      ecma: 2019,
      toplevel: true,
      output: {
        comments: false,
      },
    })
  );
}

export default config;