Function babel

packages/babel/index.js:16–39

* @param {object} [options] * @param {bool} [options.cacheDirectory] Use cache directory. Defaults to true. * @param {string[]} [options.plugins] Babel plugins to use. * @param {string[]} [options.presets] Babel presets to use. *

(options = {})

 * @return {Function}
 */
function babel(options = {}) {
  options = Object.assign(
    {
      cacheDirectory: true
    },
    options
  )

  const setter = context => prevConfig => {
    context.babel = context.babel || {}

    // Merge babel config into the one stored in context
    context.babel = Object.assign(
      {},
      context.babel,
      options,
      options.plugins ? { plugins: (context.babel.plugins || []).concat(options.plugins) } : {},
      options.presets ? { presets: (context.babel.presets || []).concat(options.presets) } : {}
    )
    return prevConfig
  }

  return Object.assign(setter, { post: postConfig })
}

function postConfig(context, util) {
  const ruleConfig = Object.assign(