text: 'use strict'
  
  const common = require('./common')
  
  function unsupportedListOption (name, value, supported) {
    return new Error(`Unsupported ${name}=${value} (${typeof value}); must be a String matching: ${Object.keys(supported).join(', ')}`)
  }
  
  module.exports = {
    supportedArchs: common.archs.reduce((result, arch) => {
      result[arch] = true
      return result
    }, {}),
    // Maps to module filename for each platform (lazy-required if used)
    supportedPlatforms: {
      darwin: './mac',
      linux: './linux',
      mas: './mac', // map to darwin
      win32: './win32'
    },
  
    // Validates list of architectures or platforms.
    // Returns a normalized array if successful, or throws an Error.
    validateListFromOptions: function validateListFromOptions (opts, supported, name) {
      if (opts.all) return Object.keys(supported)
  
      let list = opts[name] || process[name]
      if (list === 'all') return Object.keys(supported)
  
      if (!Array.isArray(list)) {
        if (typeof list === 'string') {
          list = list.split(',')
        } else {
          return unsupportedListOption(name, list, supported)
        }
      }
  
      for (let value of list) {
        if (!supported[value]) {
          return unsupportedListOption(name, value, supported)
        }
      }
  
      return list
    }
  }
  