Fixed date handling

Author: AsyncBanana

index.ts

@@ -15,15 +15,26 @@ export default function diff(
 				type: "REMOVE",
 				path: [key],
 			});
-		} else if (obj[key] && typeof obj[key] === "object") {
+		} else if (
+			obj[key] &&
+			typeof obj[key] === "object" &&
+			!(obj[key] instanceof Date)
+		) {
 			const nestedDiffs = diff(obj[key], newObj[key]);
 			diffs.push(
 				...nestedDiffs.map((difference) => {
 					difference.path.unshift(key);
 					return difference;
 				})
 			);
-		} else if (obj[key] !== newObj[key]) {
+		} else if (
+			obj[key] !== newObj[key] &&
+			!(
+				obj[key] instanceof Date &&
+				newObj[key] instanceof Date &&
+				+obj[key] === +newObj[key]
+			)
+		) {
 			diffs.push({
 				path: [key],
 				type: "CHANGE",

tests/dates.js

@@ -0,0 +1,34 @@
+import { test } from "uvu";
+import * as assert from "uvu/assert";
+import diff from "../dist/index.js";
+
+test("Handles equal dates", () => {
+	assert.equal(diff({ date: new Date(1) }, { date: new Date(1) }), []);
+});
+test("Handles unequal dates", () => {
+	assert.equal(diff({ date: new Date(1) }, { date: new Date(2) }), [
+		{
+			path: ["date"],
+			type: "CHANGE",
+			value: new Date(2),
+		},
+	]);
+});
+test("Handles value being a date and the other not", () => {
+	assert.equal(diff({ date: new Date(1) }, { date: "not date" }), [
+		{
+			path: ["date"],
+			type: "CHANGE",
+			value: "not date",
+		},
+	]);
+	assert.equal(diff({ date: "not date" }, { date: new Date(1) }), [
+		{
+			path: ["date"],
+			type: "CHANGE",
+			value: new Date(1),
+		},
+	]);
+});
+
+test.run();