feat: slack integration (#34)

Co-authored-by: Evan Gentis <evan.gentis@gmail.com>

src/notification/index.ts

@@ -1,8 +1,13 @@
 import {Config} from '../config';
 import sendEmail from './email';
+import sendSlaskMessage from './slack';
 
 export default function sendNotification(cartUrl: string) {
-	if (Config.notifications.email) {
+	if (Config.notificationMethods.toLocaleLowerCase().includes('email')) {
 		sendEmail(cartUrl);
 	}
+
+	if (Config.notificationMethods.toLocaleLowerCase().includes('slack')) {
+		sendSlaskMessage(cartUrl);
+	}
 }

src/notification/slack.ts

@@ -0,0 +1,23 @@
+import {WebClient} from '@slack/web-api';
+import {Config} from '../config';
+import {Logger} from '../logger';
+
+const channel = Config.slack.channel ?? '';
+const token = Config.slack.token ?? '';
+const web = new WebClient(token);
+
+export default function sendSlackMessage(text: string) {
+	(async () => {
+		try {
+			const result = await web.chat.postMessage({text, channel});
+			if (!result.ok) {
+				Logger.error(result.error);
+				return;
+			}
+
+			Logger.info(`✔ slack message sent to '${channel}': ${text}`);
+		} catch (error) {
+			Logger.error(error);
+		}
+	})();
+}