Testing out Puppeteer in the context of watching when a product goes back in stock on Target's website. The product page is reloaded every ten seconds, and when the 'Add to Cart' button appears, a Chromium window will open, it will add the product to the cart, it will navigate to the cart page, and then it will fill login credentials to start the checkout process.
This is a typescript app; you must have typescript installed on your computer for it to compile. Simply run npm i then npm start in the terminal.
The function determining whether or not the product is in stock does not work. This script is subject to break whenever Target changes their website.
These variables are required to be set for this to work.
SENDGRID_API_KEY=qwertyasdfjkl
SENDGRID_FROM_URL=noreply@yourdomain.com
PRODUCT_URL=https://www.target.com/p/hot-product/
RECIPIENT_EMAIL=you@email.com
RECIPIENT_NAME=Your_Name
TARGET_USERNAME=target.account.email@yourdomain.com
TARGET_PASSWORD=your-target-password