z1/daemon/snippet/verifyPorts.js

const mergePorts = require('./mergePorts')

function verifyPorts(pack, prop, origin = 'package.json') {
  const ports = pack[prop]

  if (Array.isArray(ports)) {
    if (ports.length) {
      // remove non-numeral ports
      const numeralPorts = pack[prop].filter(p => typeof p === 'number')

      // remove duplicates
      const valid = mergePorts(numeralPorts)

      if (valid.length !== pack[prop].length) {
        throw new Error(`invalid ${prop} in ${origin}`)
      }

      // everything ok
      return
    }
  } else if (ports) {
    // wrong type
    throw new TypeError(prop + ' in package.json must be an array or undefined')
  }

  // undefined or empty array
  pack[prop] = null
}

module.exports = verifyPorts