nodeを理解してない人が書いたクソコード

fix.js

const twitter = require('twitter');
const phantom = require('phantom');
require('date-utils');

var client = new twitter({
    consumer_key:        'RCGI0SmrWovkd17fY5EEesfha',
    consumer_secret:     'cPJB6f4rxSQoMUbCMvu5MhFFzDge3QWqLEPuWujm4cJVQGcHXB',
    access_token_key:    '732170942-ynGRcxDvtQcZxqGorIcKJUZaT7rRZEgSZHNWJeQl',
    access_token_secret: 'YkgAP12cSx5sRJ3KiTmx0hgI9NyQfYcBrcg25ZRHNa0U0',
});

const tweet = t => {
  client.post('statuses/update',  {status: `Switchの在庫復活した可能性が微レ存 ( ${t} ) \nhttps://store.nintendo.co.jp/customize.html`});
}

const sleep = msec => new Promise(resolve => setTimeout(resolve, msec));

(async () => {
  const instance = await phantom.create();
  const page = await instance.createPage();
  while(1){
    const status = await page.open('https://store.nintendo.co.jp/customize.html');
    const stock = await page.evaluate(function(){
      return document.querySelector("#HAC_S_KAYAA > .stock").innerHTML;
    });
    let time = new Date().toFormat("YYYY/MM/DD HH24時MI分SS秒");
    console.log("%s : %s / %s", status, stock, time);
    if(stock !== "SOLD OUT") tweet(time);
    await sleep(1000 * 60 * 10);
  }
  await instance.exit();
})();

kusocode.js

const twitter = require('twitter');
const phantom = require('phantom');
require('date-utils');

var client = new twitter({
    consumer_key:        '',
    consumer_secret:     '',
    access_token_key:    '',
    access_token_secret: '',
});

const tweet = function(t){
  client.post('statuses/update',  {status: `Switchの在庫復活した可能性が微レ存 ( ${t} ) \nhttps://store.nintendo.co.jp/customize.html`},
  function(error, tweet, response){});
}

const sleep = msec => new Promise(resolve => setTimeout(resolve, msec));

(async function() {
  const instance = await phantom.create();
  const page = await instance.createPage();
  while(1){
    const status = await page.open('https://store.nintendo.co.jp/customize.html');
    await page.evaluate(function() {
      return document.querySelector("#HAC_S_KAYAA > .stock").innerHTML;
    }).then(function(stock){
      let time = new Date().toFormat("YYYY/MM/DD HH24時MI分SS秒");
      console.log("%s : %s / %s", status, stock, time);
      if(stock !== "SOLD OUT") tweet(time);
    });
    await sleep(1000 * 60 * 10);
  }
  await instance.exit();
}());

ありがとうございます。
page.evaluate(() => { return (...); });
にすると PhantomJS は arrow関数対応してないぞ的な文句を言われますた。。。

そもそもasync/await使っているのはphantomjs-nodeのサンプルがそうだったからせっかくの機会だし勉強しようかとおもいまして。

require('date-utils');
const phantom = require('phantom');

const NINTENDO_SWITCH_STORE = 'https://store.nintendo.co.jp/customize.html';
const INTERVAL_MS = 10 * 1000;

const makeMessage = (status,stock) => {
  const time = new Date().toFormat("YYYY/MM/DD HH24時MI分SS秒");
  console.log("%s : %s / %s", status, stock, time);
  // client.post('statuses/update',
  // {
  //   status: 'Switchの在庫復活した可能性が微レ存 ( ${time} ) \nhttps://store.nintendo.co.jp/customize.html'
  // },
  // (error, tweet, response) => {
  //   console.log('エラー');
  // });
}

const check = async function() {
  const instance = await phantom.create();
  const page = await instance.createPage();
  const status = await page.open(NINTENDO_SWITCH_STORE);
  const stock = await page.evaluate(function() {
    return document.querySelector('#HAC_S_KAYAA > .stock').innerHTML;
  });
  makeMessage(status, stock);
  await instance.exit();
  setTimeout(check, INTERVAL_MS);
};

check();