Added Object.getOwnPropertyDescriptors as per #1302 (comment)

ChangeLog

@@ -45,6 +45,7 @@
             Bangle.js2: Fix regression in E.showMenu so you can use menu items with ':undefined' (as in the example in the reference)
             Graphics: Ensure that an error is thrown if a palette is used in >8 bit images. It was previously possible to ask for a palette on a 32 bit image, which caused an overflow
             Fix issue extending a class from a class from a class (fix #1529)
+            Added Object.getOwnPropertyDescriptors
 
      2v16 : JIT functions now execute in their own function scope (allows arguments)
             Move older 'HY' boards to use `g` for the built-in graphics, not `LCD` (and change docs)

src/jswrap_object.c

@@ -441,6 +441,50 @@ JsVar *jswrap_object_getOwnPropertyDescriptor(JsVar *parent, JsVar *name) {
   return obj;
 }
 
+/*JSON{
+  "type" : "staticmethod",
+  "class" : "Object",
+  "name" : "getOwnPropertyDescriptors",
+  "ifndef" : "SAVE_ON_FLASH",
+  "generate" : "jswrap_object_getOwnPropertyDescriptors",
+  "params" : [
+    ["obj","JsVar","The object"]
+  ],
+  "return" : ["JsVar","An object containing all the property descriptors of an object"]
+}
+Get information on all properties in the object (from `Object.getOwnPropertyDescriptor`), or just `{}` if no properties
+ */
+JsVar *jswrap_object_getOwnPropertyDescriptors(JsVar *parent) {
+  if (!jsvHasChildren(parent)) {
+    jsExceptionHere(JSET_TYPEERROR, "First argument must be an object, got %t", parent);
+    return 0;
+  }
+  JsVar *descriptors = jsvNewObject();
+  if (!descriptors) return 0;
+
+  /* There is some code mentioned at https://github.com/espruino/Espruino/issues/1302#issuecomment-1430833414
+
+  const protoPropDescriptor = Object.getOwnPropertyDescriptor(obj, '__proto__');
+  const descriptors = protoPropDescriptor ? { ['__proto__']: protoPropDescriptor } : {};
+
+  which we're not implementing here - but I think the current implementation is fine for 99% of cases
+  */
+
+  JsVar *ownPropertyNames = jswrap_object_keys_or_property_names(parent, JSWOKPF_INCLUDE_NON_ENUMERABLE);
+  JsvObjectIterator it;
+  jsvObjectIteratorNew(&it, ownPropertyNames);
+  while (jsvObjectIteratorHasValue(&it)) {
+    JsVar *propName = jsvObjectIteratorGetValue(&it);
+    JsVar *propValue = jswrap_object_getOwnPropertyDescriptor(parent, propName);
+    jsvObjectSetChildVar(descriptors, propName, propValue);
+    jsvUnLock2(propName, propValue);
+    jsvObjectIteratorNext(&it);
+  }
+  jsvObjectIteratorFree(&it);
+  jsvUnLock(ownPropertyNames);
+  return descriptors;
+}
+
 /*JSON{
   "type" : "method",
   "class" : "Object",

src/jswrap_object.h

@@ -43,6 +43,7 @@ JsVar *jswrap_object_keys_or_property_names(
 JsVar *jswrap_object_values_or_entries(JsVar *object, bool returnEntries);
 JsVar *jswrap_object_create(JsVar *proto, JsVar *propertiesObject);
 JsVar *jswrap_object_getOwnPropertyDescriptor(JsVar *parent, JsVar *name);
+JsVar *jswrap_object_getOwnPropertyDescriptors(JsVar *parent);
 bool jswrap_object_hasOwnProperty(JsVar *parent, JsVar *name);
 JsVar *jswrap_object_defineProperty(JsVar *parent, JsVar *propName, JsVar *desc);
 JsVar *jswrap_object_defineProperties(JsVar *parent, JsVar *props);

tests/test_object_getOwnPropertyDescriptors.js

@@ -0,0 +1,19 @@
+var A = {
+  b : 42,
+  c : function() {}
+};
+
+class B {
+};
+
+
+var r = [
+ // [JSON.stringify(Object.getOwnPropertyDescriptors(A)),'{"b":{"writable":true,"enumerable":true,"configurable":true,"value":42},"c":{"writable":true,"enumerable":true,"configurable":true}}'],
+  // this one is not correct as it seems V8 adds 'length' and 'name' fields to classes
+  //[JSON.stringify(Object.getOwnPropertyDescriptors(B)),"{\"prototype\":{\"writable\":true,\"enumerable\":true,\"configurable\":true,\"value\":{}}}"]
+];
+
+//console.log(r);
+
+result = r.every(a => a[0]==a[1]);
+