chooseFile.js

const chooseFile = async ({ directory, message }) => {
  const candidateFiles = await filesystem.list(directory)
  
  const promptConfig = {
    name: 'chosenFile',
    message,
    choices: ['all', prompt.separator(), ...candidateFiles]
  }
  const { chosenFile } = await prompt.ask(promptConfig)
  
  return chosenFile
}