feat: use ts, update cd, update README (#12)

Signed-off-by: Jef LeCompte <jeffreylec@gmail.com>

src/index.ts

@@ -0,0 +1,95 @@
+import {Config} from './config';
+import {Store, Stores} from './store';
+import puppeteer from 'puppeteer';
+import open from 'open';
+import sendNotification from './notification';
+import {Logger} from './logger';
+
+/**
+ * Starts the bot.
+ */
+async function main() {
+	const results = [];
+	for (const store of Stores) {
+		Logger.debug(store.links);
+		results.push(lookup(store));
+	}
+
+	await Promise.all(results);
+
+	Logger.info('↗ trying stores again');
+	setTimeout(main, Config.rateLimitTimeout);
+}
+
+/**
+ * Responsible for looking up information about a each product within
+ * a `Store`. It's important that we ignore `no-await-in-loop` here
+ * because we don't want to get rate limited within the same store.
+ *
+ * @param store Vendor of graphics cards.
+ */
+async function lookup(store: Store) {
+/* eslint-disable no-await-in-loop */
+	for (const link of store.links) {
+		const browser = await puppeteer.launch();
+		const page = await browser.newPage();
+		await page.setUserAgent(Config.page.userAgent);
+		await page.setViewport({
+			height: Config.page.height,
+			width: Config.page.width
+		});
+
+		await page.goto(link.url, {waitUntil: 'networkidle0'});
+
+		const bodyHandle = await page.$('body');
+		const textContent = await page.evaluate(body => body.textContent, bodyHandle);
+
+		Logger.debug(textContent);
+
+		const graphicsCard = `${link.brand} ${link.model}`;
+
+		if (isOutOfStock(textContent, link.oosLabels)) {
+			Logger.info(`✖ [${store.name}] ${graphicsCard} is still out of stock`);
+		} else {
+			Logger.info(`🚀🚀🚀 [${store.name}] ${graphicsCard} IN STOCK 🚀🚀🚀`);
+			Logger.info(link.url);
+
+			Logger.debug('ℹ saving screenshot');
+			await page.screenshot({path: `success-${Date.now()}.png`});
+
+			const givenUrl = store.cartUrl ? store.cartUrl : link.url;
+			await open(givenUrl);
+			sendNotification(givenUrl);
+		}
+
+		await browser.close();
+	}
+/* eslint-enable no-await-in-loop */
+}
+
+/**
+ * Checks if DOM has any out-of-stock related text.
+ *
+ * @param domText Complete DOM of website.
+ * @param oosLabels Out-of-stock labels.
+ */
+function isOutOfStock(domText: string, oosLabels: string[]) {
+	const domTextLowerCase = domText.toLowerCase();
+	let result = false;
+	for (const oosLabel of oosLabels) {
+		result = domTextLowerCase.includes(oosLabel.toLowerCase());
+	}
+
+	return result;
+}
+
+/**
+ * Will continually run until user interferes.
+ */
+try {
+	void main();
+} catch (error) {
+	// Ignoring errors; more than likely due to rate limits
+	Logger.error(error);
+	void main();
+}