Tweet with Deno using Puppeteer

tweet.ts

import type { Browser } from "https://deno.land/x/puppeteer@9.0.2/mod.ts";

// I do not like having the functions here as class methods because they are meant to be used as utilities.
// But you could have them in a class. :)

const endpoint = "https://twitter.com";

/**
 * Visits Twitter and signs in with the provided credentials if not already signed in.
 */
export async function authenticate(
  browser: Browser,
  credentials: { username: string; password: string }
) {
  const page = await browser.newPage();
  await page.goto(endpoint, { waitUntil: "networkidle2" });
  if ((await page.$("[data-testid=loginButton]")) != null) {
    await page.goto(`${endpoint}/login`, { waitUntil: "networkidle2" });
    await (await page.waitForXPath(
      '//*[text() = "Phone, email, or username"]'
    ))!.click();
    await page.keyboard.type(credentials.username);
    await (await page.waitForXPath('//*[text() = "Next"]'))!.click();
    await (await page.waitForXPath('//*[text() = "Password"]'))!.click();
    await page.keyboard.type(credentials.password);
    await (await page.waitForSelector(
      '[data-testid="LoginForm_Login_Button"]'
    ))!.click();
    await page.waitForNavigation();
  }
  await page.close();
}

/**
 * Visits Twitter and makes a tweet.
 *
 *  - No time will be wasted, and
 *  - an error will be thrown unless the tweet is successful. :P
 */
export async function tweet(browser: Browser, text: string) {
  const page = await browser.newPage();
  await page.goto(`${endpoint}/home`, { waitUntil: "networkidle2" });
  await (await page.waitForSelector(".DraftEditor-root"))!.click();
  await page.keyboard.type(text);
  await (await page.waitForSelector(
    "[data-testid=tweetButtonInline]"
  ))!.click();
  await page.waitForXPath('//span[text() = "Your Tweet was sent."]');
  await page.close();
}