import loaderUtils from 'loader-utils'

// Note: no export default here cause of Babel 6
module.exports = function includeFilesLoader(sourceCode: string) {
  if (this.cacheable) {
    this.cacheable()
  }
  const loaderOptions = loaderUtils.getOptions(this)

  if (loaderOptions.include && loaderOptions.include.length) {
    const includes = loaderOptions.include
      .map(
        modPath => `require(${loaderUtils.stringifyRequest(this, modPath)});`
      )
      .join('\n')

    const code = [includes, sourceCode].join('\n')

    this.callback(null, code, null)
    return
  }

  this.callback(null, sourceCode, null)
}