Add simple serializer with Set support

src/lib/object/serializer.ts

@@ -0,0 +1,31 @@
+const SetPrefix = '@__Set__@';
+
+function replacer(this: any, key: string, value: any) {
+    if (value instanceof Set) {
+        return SetPrefix + JSON.stringify(Array.from(value));
+    }
+
+    return value;
+}
+
+function reviver(this: any, key: string, value: any) {
+    if (typeof value === 'string') {
+        if (value.startsWith(SetPrefix))
+            return new Set(JSON.parse(value.substring(SetPrefix.length)));
+    }
+
+    return value;
+}
+
+function serialize(value: any) {
+    return JSON.stringify(value, replacer);
+}
+
+function deserialize<T>(text: string): T {
+    return JSON.parse(text, reviver);
+}
+
+export const Serializer = {
+    serialize,
+    deserialize,
+}

test/tests/serializer-sanity.ts

@@ -0,0 +1,43 @@
+import { Serializer } from "../../src/lib/object/serializer";
+import { Assert } from "../lib/assert";
+
+export function serializeDeserializeWorks() {
+    const source = {
+        set1: new Set([ 'a', 'b', { wtf: 32 } ]),
+        set2: new Set(),
+        whatever: {
+            x: -32,
+            y: 32,
+        },
+    };
+
+    const text = Serializer.serialize(source);
+
+    Assert(text).toStrictlyBe("{\"set1\":\"@__Set__@[\\\"a\\\",\\\"b\\\",{\\\"wtf\\\":32}]\",\"set2\":\"@__Set__@[]\",\"whatever\":{\"x\":-32,\"y\":32}}");
+
+    const sourceClone = Serializer.deserialize<typeof source>(text);
+
+    Assert(sourceClone.set1 instanceof Set).toBeTruthy();
+    Assert(sourceClone.set1.has('a')).toBeTruthy();
+    Assert(sourceClone.set1.has('b')).toBeTruthy();
+    Assert(sourceClone.set1.size).toStrictlyBe(3);
+
+    Assert(sourceClone.set2 instanceof Set).toBeTruthy();
+    Assert(sourceClone.set2.size).toStrictlyBe(0);
+
+    Assert(sourceClone.whatever.x).toStrictlyBe(-32);
+    Assert(sourceClone.whatever.y).toStrictlyBe(32);
+
+    Assert(Object.keys(sourceClone).length).toStrictlyBe(3);
+}
+
+export function canSerializeSetDirectly() {
+    const source = new Set();
+
+    const text = Serializer.serialize(source);
+
+    const sourceClone = Serializer.deserialize<typeof source>(text);
+
+    Assert(sourceClone instanceof Set).toBeTruthy();
+    Assert(sourceClone.size).toStrictlyBe(0);
+}