import { isFileContainExport } from './isFileContainExport'

export const getFileNamesInDestinationContainExport = async ({
  fileNames,
  currentWorkingDirectory,
  babelConfigPath,
}: {
  fileNames: string[]
  currentWorkingDirectory: string
  babelConfigPath?: string
}): Promise<string[]> => {
  const fileNamePromiseObjects = fileNames.map(fileName => ({
    fileName,
    promiseCheckIfFileContainExport: isFileContainExport({
      fileName,
      currentWorkingDirectory,
      babelConfigPath,
    }).then(value => {
      return value
    }),
  }))

  // wait until all file in destination has been checked
  const promises = fileNamePromiseObjects.map(({ promiseCheckIfFileContainExport }) => promiseCheckIfFileContainExport)
  const fileNamesReturnedByPromise = await Promise.all(promises)

  // fileNamesOfFileContainExport
  const fileNamesOfFileConrainExport = fileNamesReturnedByPromise.filter(x => typeof x == 'string')

  return fileNamesOfFileConrainExport
}