@quasar/cli/lib/ask.js

// Following is adapted from Vue CLI v2 "init" command

const async = require('async')
const inquirer = require('inquirer')
const evaluate = require('./eval')

// Support types from prompt-for which was used before
const promptMapping = {
  string: 'input',
  boolean: 'confirm'
}

/**
 * Ask questions, return results.
 *
 * @param {Object} prompts
 * @param {Object} data
 * @param {Function} done
 */

module.exports = function ask (prompts, data, done) {
  async.eachSeries(Object.keys(prompts), (key, next) => {
    prompt(data, key, prompts[key], next)
  }, done)
}

/**
 * Inquirer prompt wrapper.
 *
 * @param {Object} data
 * @param {String} key
 * @param {Object} prompt
 * @param {Function} done
 */

function prompt (data, key, prompt, done) {
  // skip prompts whose when condition is not met
  if (prompt.when && !evaluate(prompt.when, data)) {
    return done()
  }

  let promptDefault = prompt.default
  if (typeof prompt.default === 'function') {
    promptDefault = function () {
      return prompt.default.bind(this)(data)
    }
  }

  let promptTransformer = prompt.transformer
  if (typeof prompt.transformer === 'function') {
    promptTransformer = function (input) {
      return prompt.transformer.bind(this)(input, data)
    }
  }
  
  let promptFilter = prompt.filter
  if (typeof prompt.filter === 'function') {
    promptFilter = function (input) {
      return prompt.filter.bind(this)(input, data)
    }
  }

  inquirer.prompt([{
    type: promptMapping[prompt.type] || prompt.type,
    name: key,
    message: prompt.message || prompt.label || key,
    default: promptDefault,
    choices: prompt.choices || [],
    validate: prompt.validate || (() => true),
    transformer: promptTransformer,
    filter: promptFilter
  }]).then(answers => {
    if (Array.isArray(answers[key])) {
      data[key] = {}
      answers[key].forEach(multiChoiceAnswer => {
        data[key][multiChoiceAnswer] = true
      })
    }
    else if (typeof answers[key] === 'string') {
      data[key] = answers[key].replace(/"/g, '\\"')
    }
    else {
      data[key] = answers[key]
    }
    done()
  }).catch(done)
}