[FIX] reactivity: do not observe eventtarget and other stuff

src/reactivity.ts

@@ -20,6 +20,7 @@ export type Reactive<T extends Target = Target> = T & {
 type NonReactive<T extends Target = Target> = T & {
   [SKIP]: any;
 };
+const objectToString = Object.prototype.toString;
 
 /**
  * Checks whether a given value can be made into a reactive object.
@@ -28,14 +29,14 @@ type NonReactive<T extends Target = Target> = T & {
  * @returns whether the value can be made reactive
  */
 function canBeMadeReactive(value: any): boolean {
-  return (
-    typeof value === "object" &&
-    value !== null &&
-    !(value instanceof Date) &&
-    !(value instanceof Promise) &&
-    !(value instanceof String) &&
-    !(value instanceof Number)
-  );
+  if (typeof value !== "object") {
+    return false;
+  }
+  // extract "RawType" from strings like "[object RawType]" => this lets us
+  // ignore many native objects such as Promise (whose toString is [object Promise])
+  // or Date ([object Date]).
+  const rawType = objectToString.call(value).slice(8, -1);
+  return rawType === "Object" || rawType === "Array";
 }
 
 /**

tests/reactivity.test.ts

@@ -1093,6 +1093,19 @@ describe("Reactivity", () => {
     expect(n).toBe(1);
     expect(state.k).toEqual({ n: 2 });
   });
+
+  test("can add collections set/weakset/map/weakmap in a reactive object", () => {
+    const rawSet = new Set();
+    const rawWeakSet = new WeakSet();
+    const rawMap = new Map();
+    const rawWeakMap = new WeakMap();
+
+    const obj = reactive({ rawSet, rawWeakSet, rawMap, rawWeakMap });
+    expect(obj.rawSet).toBe(rawSet);
+    expect(obj.rawWeakSet).toBe(rawWeakSet);
+    expect(obj.rawMap).toBe(rawMap);
+    expect(obj.rawWeakMap).toBe(rawWeakMap);
+  });
 });
 
 describe("markRaw", () => {