rollup.config.js

import * as meta from "./package.json";
import { nodeResolve } from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs';
import {terser} from 'rollup-plugin-terser';
import css from 'rollup-plugin-css-only'
import copy from 'rollup-plugin-copy'

const config = {
  input: "src/index.js",
  output: {
    file: `dist/${meta.name}.js`,
    name: "ObservableLocal",
    format: "umd",
    indent: false,
    extend: true,
  },
  plugins: [
    nodeResolve(),
    commonjs(),
    css({ output: `${meta.name}.css` }),
  ]
};

export default [
  {
    ...config,
    plugins: [
      ...config.plugins,
      copy({
        targets: [{ src: 'src/index.html', dest: 'dist' }]
      }),
    ]
  },
  {
    ...config,
    output: {
      ...config.output,
      file: `dist/${meta.name}.min.js`
    },
    plugins: [
      ...config.plugins,
      terser()
    ]
  }
];