improve error message for weird objects in ObjectMiddleware

add Date serializer to default serializers

lib/serialization/DateObjectSerializer.js

@@ -0,0 +1,16 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+*/
+
+"use strict";
+
+class DateObjectSerializer {
+	serialize(obj, { write }) {
+		write(obj.getTime());
+	}
+	deserialize({ read }) {
+		return new Date(read());
+	}
+}
+
+module.exports = DateObjectSerializer;

lib/serialization/ObjectMiddleware.js

@@ -5,6 +5,7 @@
 "use strict";
 
 const ArraySerializer = require("./ArraySerializer");
+const DateObjectSerializer = require("./DateObjectSerializer");
 const ErrorObjectSerializer = require("./ErrorObjectSerializer");
 const MapObjectSerializer = require("./MapObjectSerializer");
 const NullPrototypeObjectSerializer = require("./NullPrototypeObjectSerializer");
@@ -94,6 +95,7 @@ jsTypes.set(Array, new ArraySerializer());
 jsTypes.set(null, new NullPrototypeObjectSerializer());
 jsTypes.set(Map, new MapObjectSerializer());
 jsTypes.set(Set, new SetObjectSerializer());
+jsTypes.set(Date, new DateObjectSerializer());
 jsTypes.set(RegExp, new RegExpObjectSerializer());
 jsTypes.set(Error, new ErrorObjectSerializer(Error));
 jsTypes.set(EvalError, new ErrorObjectSerializer(EvalError));
@@ -267,17 +269,26 @@ class ObjectMiddleware extends SerializerMiddleware {
 					} catch (e) {
 						// ignore -> fallback
 					}
-					if (typeof item === "object" && item !== null && item.constructor) {
-						if (item.constructor === Object)
-							return `Object { ${Object.keys(item).join(", ")} }`;
-						if (item.constructor === Map) return `Map { ${item.size} items }`;
-						if (item.constructor === Array)
-							return `Array { ${item.length} items }`;
-						if (item.constructor === Set) return `Set { ${item.size} items }`;
-						if (item.constructor === RegExp) return item.toString();
-						return `${item.constructor.name}`;
+					if (typeof item === "object" && item !== null) {
+						if (item.constructor) {
+							if (item.constructor === Object)
+								return `Object { ${Object.keys(item).join(", ")} }`;
+							if (item.constructor === Map) return `Map { ${item.size} items }`;
+							if (item.constructor === Array)
+								return `Array { ${item.length} items }`;
+							if (item.constructor === Set) return `Set { ${item.size} items }`;
+							if (item.constructor === RegExp) return item.toString();
+							return `${item.constructor.name}`;
+						}
+						return `Object [null prototype] { ${Object.keys(item).join(
+							", "
+						)} }`;
+					}
+					try {
+						return `${item}`;
+					} catch (e) {
+						return `(${e.message})`;
 					}
-					return `${item}`;
 				})
 				.join(" -> ");
 		};