zoro-cli/lib/plugins/config-webpack/template/script/resolveLibConfig.js

https://github.com/vuejs/vue-cli

// const { error } = require('zoro-cli-util/logger')

module.exports = ({ configurator, options }) => {
  function genConfig(format, _options = {}) {
    const { postfix, min } = _options
    const webpackConfig = configurator.resolveChainableWebpackConfig()

    const entries = webpackConfig.entryPoints.entries()
    let entryName = Object.keys(entries)[0]
    const entryPath = webpackConfig.entry(entryName).values()[0]

    // entry
    entryName = postfix ? `${entryName}.${postfix}` : entryName
    webpackConfig.entryPoints.clear()
    webpackConfig.entry(entryName).add(entryPath)

    // output
    webpackConfig.output
      .libraryTarget(format)
      .filename(`${entryName}.js`)
      .chunkFilename(`${entryName}.[name].js`)

    // adjust css output name so they write to the same file
    if (webpackConfig.plugins.has('extract-css')) {
      webpackConfig.plugin('extract-css').tap(args => {
        args[0].filename = `${entryName}.css`
        return args
      })
    }

    webpackConfig.optimization.minimize(min === true)

    const config = configurator.resolveWebpackConfig(webpackConfig)
    return config
  }

  const { filenamePostfixes = {} } = options
  const { common = 'common', umd = '', umdMin = 'min' } = filenamePostfixes

  return [
    genConfig('commonjs2', { postfix: common }),
    genConfig('umd', { postfix: umd }),
    genConfig('umd', { postfix: umdMin, min: true }),
  ]
}