From 36f31a48185f0607c2d10f3545e17f999d0206f7 Mon Sep 17 00:00:00 2001
From: Pedro Gallardo <pedrogallardo7011@gmail.com>
Date: Mon, 11 Mar 2024 02:08:21 -0300
Subject: [PATCH] feat: adds getOwnPropertyDescriptor handler

---
 src/events/handlers/defineProperty.ts         |  9 +----
 .../handlers/getOwnPropertyDescriptor.ts      | 35 +++++++++++++++++++
 src/events/handlers/index.ts                  | 11 +++++-
 src/types/Nexo.ts                             |  6 ++++
 4 files changed, 52 insertions(+), 9 deletions(-)
 create mode 100644 src/events/handlers/getOwnPropertyDescriptor.ts

diff --git a/src/events/handlers/defineProperty.ts b/src/events/handlers/defineProperty.ts
index c223ee8..b885e66 100644
--- a/src/events/handlers/defineProperty.ts
+++ b/src/events/handlers/defineProperty.ts
@@ -2,17 +2,10 @@ import Nexo from "../../types/Nexo.js";
 import { isTraceable, map } from "../../utils/index.js";
 import ProxyEvent from "../ProxyEvent.js";
 
-type descriptor = {
-  enumerable?: boolean;
-  writable?: boolean;
-  configurable?: boolean;
-  value?: unknown;
-};
-
 const defineProperty = (
   mock: Nexo.Mock,
   key: Nexo.objectKey,
-  descriptor: descriptor,
+  descriptor: PropertyDescriptor,
 ): boolean => {
   const proxy = map.tracables.get(mock);
   const data = map.proxies.get(proxy);
diff --git a/src/events/handlers/getOwnPropertyDescriptor.ts b/src/events/handlers/getOwnPropertyDescriptor.ts
new file mode 100644
index 0000000..33bb156
--- /dev/null
+++ b/src/events/handlers/getOwnPropertyDescriptor.ts
@@ -0,0 +1,35 @@
+import Nexo from "../../types/Nexo.js";
+import { getTarget, map } from "../../utils/index.js";
+import ProxyEvent from "../ProxyEvent.js";
+
+const getOwnPropertyDescriptor = (
+  mock: Nexo.Mock,
+  key: Nexo.objectKey,
+): PropertyDescriptor => {
+  const proxy = map.tracables.get(mock);
+  const data = map.proxies.get(proxy);
+
+  const { sandbox } = data;
+  const scope = data.scope.deref();
+  const value = getTarget(sandbox.get(key), true);
+
+  const event = new ProxyEvent("handler.getOwnPropertyDescriptor", {
+    proxy,
+    key,
+  });
+
+  scope.emit(event.name, event);
+
+  if (event.defaultPrevented) {
+    return event.returnValue;
+  }
+
+  return {
+    configurable: false,
+    enumerable: true,
+    writable: false,
+    value,
+  };
+};
+
+export default getOwnPropertyDescriptor;
diff --git a/src/events/handlers/index.ts b/src/events/handlers/index.ts
index c8a2363..2875f38 100644
--- a/src/events/handlers/index.ts
+++ b/src/events/handlers/index.ts
@@ -2,7 +2,16 @@ import get from "./get.js";
 import set from "./set.js";
 import defineProperty from "./defineProperty.js";
 import deleteProperty from "./deleteProperty.js";
+import getOwnPropertyDescriptor from "./getOwnPropertyDescriptor.js";
 import construct from "./construct.js";
 import apply from "./apply.js";
 
-export default { get, set, defineProperty, deleteProperty, construct, apply };
+export default {
+  get,
+  set,
+  defineProperty,
+  deleteProperty,
+  getOwnPropertyDescriptor,
+  construct,
+  apply,
+};
diff --git a/src/types/Nexo.ts b/src/types/Nexo.ts
index c018b0b..4964b4a 100644
--- a/src/types/Nexo.ts
+++ b/src/types/Nexo.ts
@@ -37,6 +37,7 @@ declare namespace Nexo {
       | "handler.set"
       | "handler.defineProperty"
       | "handler.deleteProperty"
+      | "handler.getOwnPropertyDescriptor"
       | "handler.apply"
       | "handler.construct";
 
@@ -61,6 +62,11 @@ declare namespace Nexo {
       key: objectKey;
     }
 
+    interface getOwnPropertyDescriptorHandler extends ProxyEvent {
+      name: "handler.getOwnPropertyDescriptor";
+      key: objectKey;
+    }
+
     interface applyHandler extends ProxyEvent {
       name: "handler.apply";
       args: unknown[];