IE9 compatible rollup config. 兼容IE9的Rollup配置

rollup.config.js

// npm install --save-dev rollup @rollup/plugin-babel @rollup/plugin-node-resolve @rollup/plugin-commonjs @babel/core @babel/preset-env core-js regenerator-runtime
// npm install --save core-js regenerator-runtime

/**
 * IE9 compatible rollup config
 */

import babel from '@rollup/plugin-babel';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';

export default {
  input: 'src/index.js',
  output: {
    file: 'dist/bundle.js',
    format: 'iife',
    name: 'RichTextEditor'
  },
  plugins: [
    resolve(),
    commonjs(),
    babel({
      babelHelpers: 'bundled',
      presets: [
        ['@babel/preset-env', {
          targets: {
            ie: '9'
          },
          useBuiltIns: 'usage',
          corejs: 3
        }]
      ],
      exclude: 'node_modules/**'
    })
  ]
};