How to use the @redux-saga/is.undef function in @redux-saga/is

export function put(channel, action) {
  if (process.env.NODE_ENV !== 'production') {
    if (arguments.length > 1) {
      check(channel, is.notUndef, 'put(channel, action): argument channel is undefined')
      check(channel, is.channel, `put(channel, action): argument ${channel} is not a valid channel`)
      check(action, is.notUndef, 'put(channel, action): argument action is undefined')
    } else {
      check(channel, is.notUndef, 'put(action): argument action is undefined')
    }
  }
  if (is.undef(action)) {
    action = channel
    // `undefined` instead of `null` to make default parameter work
    channel = undefined
  }
  return makeEffect(effectTypes.PUT, { channel, action })
}

const cpsCb = (err, res) => {
      if (is.undef(err)) {
        cb(res)
      } else {
        cb(err, true)
      }
    }