rollup.config.js

import babel from "rollup-plugin-babel";
import {terser} from "rollup-plugin-terser";
import * as typescript from "typescript";
import typescript2 from "rollup-plugin-typescript2";
import tslint from "rollup-plugin-tslint";
import { readFileSync } from "fs";

const plugins = [
  tslint({
    exclude: [
      "node_modules/**",
    ],
  }),
  typescript2({
    typescript: typescript,
  }),
];

if (!process.env.ROLLUP_WATCH) {
  plugins.push(terser({
    keep_classnames: true,
  }));
}

const promisePolyfill = readFileSync("node_modules/promise-polyfill/dist/polyfill.min.js").toString();

export default [
  {
    input: "./src/index.ts",
    output: [
      {
        dir: "dist",
        format: "umd",
        name: "clipboard",
        sourcemap: true,
      },
    ],
    plugins,
  },
  {
    input: "./src/index.ts",
    output: [
      {
        file: "dist/clipboard-polyfill.esm.js",
        format: "esm",
        sourcemap: true,
      },
    ],
    plugins,
  },
  {
    input: "./src/index.ts",
    output: [
      {
        banner: promisePolyfill,
        file: "dist/clipboard-polyfill.promise.js",
        format: "umd",
        name: "clipboard",
        sourcemap: true,
      },
    ],
    plugins: [
      ...plugins,
      babel({
        extensions: [".js", ".ts"],
        presets: [
          ["@babel/preset-typescript", {
            modules: false,
              targets: {
                browsers: "last 2 versions",
                  ie: 11,
              },
          }],
        ],
      }),
    ],
  },
];