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name : plugins.js
 'use strict'

const req = require('./req.js')

/**
 * Plugin Loader
 *
 * @private
 * @method load
 *
 * @param  {String} plugin PostCSS Plugin Name
 * @param  {Object} options PostCSS Plugin Options
 *
 * @return {Function} PostCSS Plugin
 */
const load = (plugin, options, file) => {
  try {
    if (
      options === null ||
      options === undefined ||
      Object.keys(options).length === 0
    ) {
      return req(plugin, file)
    } else {
      return req(plugin, file)(options)
    }
  } catch (err) {
    throw new Error(`Loading PostCSS Plugin failed: ${err.message}\n\n(@${file})`)
  }
}

/**
 * Load Plugins
 *
 * @private
 * @method plugins
 *
 * @param {Object} config PostCSS Config Plugins
 *
 * @return {Array} plugins PostCSS Plugins
 */
const plugins = (config, file) => {
  let plugins = []

  if (Array.isArray(config.plugins)) {
    plugins = config.plugins.filter(Boolean)
  } else {
    plugins = Object.keys(config.plugins)
      .filter((plugin) => {
        return config.plugins[plugin] !== false ? plugin : ''
      })
      .map((plugin) => {
        return load(plugin, config.plugins[plugin], file)
      })
  }

  if (plugins.length && plugins.length > 0) {
    plugins.forEach((plugin, i) => {
      if (plugin.default) {
        plugin = plugin.default
      }

      if (plugin.postcss === true) {
        plugin = plugin()
      } else if (plugin.postcss) {
        plugin = plugin.postcss
      }

      if (
        // eslint-disable-next-line
        !(
          (typeof plugin === 'object' && Array.isArray(plugin.plugins)) ||
          (typeof plugin === 'object' && plugin.postcssPlugin) ||
          (typeof plugin === 'function')
        )
      ) {
        throw new TypeError(`Invalid PostCSS Plugin found at: plugins[${i}]\n\n(@${file})`)
      }
    })
  }

  return plugins
}

module.exports = plugins
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