chore: update demo

Author: triniwiz

apps/demo/src/plugin-demos/firebase-firestore.ts

@@ -14,9 +14,37 @@ export class DemoModel extends DemoSharedFirebaseFirestore {
 	}
 
 	testIt(): void {
+		this.issue_51();
 		Promise.all([this.init(), this.invalid_field_path()]);
 	}
 
+	issue_51() {
+		const doc = firebase().firestore().collection('users').doc('0Myq8dlF1dQtC7tX4WlA');
+
+		doc.onSnapshot({
+			next(snapshot) {
+				console.log('onSnapshot', 'object');
+			},
+		});
+
+		doc.onSnapshot(
+			{ includeMetadataChanges: true },
+			{
+				next(snapshot) {
+					console.log('onSnapshot', 'options', '&', 'object');
+				},
+			}
+		);
+
+		doc.onSnapshot((doc) => {
+			console.log('onSnapshot', '&', 'function');
+		});
+
+		doc.onSnapshot({ includeMetadataChanges: true }, (doc) => {
+			console.log('onSnapshot', 'options', '&', 'function');
+		});
+	}
+
 	async init() {
 		firebase()
 			.firestore()