rollup.config.js

import babel from 'rollup-plugin-babel'
import modify from 'rollup-plugin-modify'
import pkg from './package.json'

export default [
  {
  input: 'src/index.js',
  output: {
    file: 'htdocs/js/c3.js',
    name: 'c3',
    format: 'umd',
    banner: `/* @license C3.js v${pkg.version} | (c) C3 Team and other contributors | http://c3js.org/ */`,
    globals: {
      d3: 'd3'
    }
  },
  plugins: [
    babel({
      presets: [
        [
          '@babel/preset-env',
          {
              modules: false
            }
          ]
        ]
      })
    ],
    external: ['d3']
  },
  {
    input: 'src/index.js',
    output: {
      file: 'htdocs/js/c3.esm.js',
      name: 'c3',
      format: 'es',
      banner: `/* @license C3.js v${pkg.version} | (c) C3 Team and other contributors | http://c3js.org/ */`,
      intro: `import * as d3 from 'd3';`
    },
    plugins: [
      modify({
        find: /\$\$\.d3 =.+?;/,
        replace: '$$.d3 = d3;'
      })
    ],
    external: ['d3']
  }
]