rollup.config.js

import babel from "rollup-plugin-babel";
import commonjs from "@rollup/plugin-commonjs";
import external from "rollup-plugin-peer-deps-external";
import { terser } from "rollup-plugin-terser";

export default {
  input: "./index.js",
  output: [
    {
      file: "dist/index.js",
      format: "cjs",
      sourcemap: true
    }
  ],
  plugins: [
    external({
      includeDependencies: true
    }),
    babel({
      presets: ["react-app"],
      plugins: [
        ["@babel/plugin-proposal-decorators", { legacy: true }],
        "babel-plugin-parameter-decorator",
        ["@babel/plugin-proposal-class-properties", { loose: true }]
      ],
      exclude: "node_modules/**",
      runtimeHelpers: true
    }),
    commonjs(),
    terser()
  ]
};