fix: improve event prop merging; add currentTarget

src/misc/event-emitter.js

@@ -42,6 +42,12 @@ export const EventEmitter = function (nodeStyle) {
         writable: false,
         value: this,
       });
+      if (!args[0].currentTarget) {
+        Object.defineProperty(args[0], "currentTarget", {
+          writable: false,
+          value: this,
+        });
+      }
     }
     const legacylistener = emitter[`on${event}`];
     if (legacylistener) {

src/misc/events.js

@@ -13,7 +13,9 @@ export const mergeObjects = function (src, dst) {
     }
     const v = src[k];
     try {
-      dst[k] = v;
+      if (dst[k] !== v) {
+        Object.defineProperty(dst, k, { value: v });
+      }
     } catch (error) {}
   }
   return dst;

tests/event-target.spec.ts

@@ -7,7 +7,7 @@ test("event target should be xhr self", async ({ page }) => {
       const xhr = new XMLHttpRequest();
       xhr.open("GET", "example1.txt");
       xhr.addEventListener("load", function (e) {
-        resolve(e.target === xhr);
+        resolve(e.target === xhr && e.currentTarget === xhr);
       });
       xhr.send();
     });