vue2-datepicker/rollup.config.js

import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import babel from '@rollup/plugin-babel';
import vue from 'rollup-plugin-vue';
import { terser } from 'rollup-plugin-terser';
import pkg from './package.json';

const external = Object.keys(pkg.dependencies);

const input = 'src/index.js';

const plugins = [
  resolve({
    extensions: ['.js', '.jsx', '.es6', '.es', '.mjs', '.vue'],
  }),
  vue(),
  babel({
    babelHelpers: 'bundled',
    skipPreflightCheck: true,
    extensions: ['.js', '.jsx', '.es6', '.es', '.mjs', '.vue'],
  }),
  commonjs(),
];

const esm = {
  external,
  input,
  output: [
    {
      file: pkg.module,
      format: 'esm',
      exports: 'named',
    },
  ],
  plugins,
};

const umd = {
  input,
  external: 'vue',
  output: [
    {
      file: pkg.main,
      format: 'umd',
      name: 'DatePicker',
      sourcemap: true,
      globals: {
        vue: 'Vue',
      },
    },
    {
      file: pkg.main.replace(/\.js$/, '.min.js'),
      format: 'umd',
      name: 'DatePicker',
      sourcemap: true,
      globals: {
        vue: 'Vue',
      },
      plugins: [
        terser({
          output: { comments: false },
          compress: {
            keep_infinity: true,
            pure_getters: true,
          },
          warnings: true,
          ecma: 5,
          toplevel: false,
        }),
      ],
    },
  ],
  plugins,
};

export default [esm, umd];