Add default implementation for Object.create(prototype)

Summary:
Add default implementation for `Object.create` with custom parent. This
default implementation calls into the global object to get the
`Object.create` function, and then calls that function with the
prototype.

Differential Revision: D66485209

packages/react-native/ReactCommon/jsi/jsi/decorator.h

@@ -232,6 +232,10 @@ class RuntimeDecorator : public Base, private jsi::Instrumentation {
     return plain_.utf16(sym);
   }
 
+  Object createObjectWithPrototype(const Object& prototype) override {
+    return plain_.createObjectWithPrototype(prototype);
+  }
+
   Object createObject() override {
     return plain_.createObject();
   };
@@ -695,6 +699,11 @@ class WithRuntimeDecorator : public RuntimeDecorator<Plain, Base> {
     return RD::createValueFromJsonUtf8(json, length);
   };
 
+  Object createObjectWithPrototype(const Object& prototype) override {
+    Around around{with_};
+    return RD::createObjectWithPrototype(prototype);
+  }
+
   Object createObject() override {
     Around around{with_};
     return RD::createObject();

packages/react-native/ReactCommon/jsi/jsi/jsi.cpp

@@ -258,6 +258,13 @@ std::u16string Runtime::utf16(const String& str) {
   return convertUTF8ToUTF16(utf8Str);
 }
 
+Object Runtime::createObjectWithPrototype(const Object& prototype) {
+  auto createFn = global()
+                      .getPropertyAsObject(*this, "Object")
+                      .getPropertyAsFunction(*this, "create");
+  return createFn.call(*this, prototype).asObject(*this);
+}
+
 Pointer& Pointer::operator=(Pointer&& other) noexcept {
   if (ptr_) {
     ptr_->invalidate();

packages/react-native/ReactCommon/jsi/jsi/jsi.h

@@ -332,6 +332,7 @@ class JSI_EXPORT Runtime {
   virtual Object createObject(std::shared_ptr<HostObject> ho) = 0;
   virtual std::shared_ptr<HostObject> getHostObject(const jsi::Object&) = 0;
   virtual HostFunctionType& getHostFunction(const jsi::Function&) = 0;
+  virtual Object createObjectWithPrototype(const Object& prototype);
 
   virtual bool hasNativeState(const jsi::Object&) = 0;
   virtual std::shared_ptr<NativeState> getNativeState(const jsi::Object&) = 0;
@@ -688,6 +689,11 @@ class JSI_EXPORT Object : public Pointer {
     return runtime.createObject(ho);
   }
 
+  /// Creates a new Object with the custom prototype
+  Object create(Runtime& runtime, const Object& prototype) {
+    return runtime.createObjectWithPrototype(prototype);
+  }
+
   /// \return whether this and \c obj are the same JSObject or not.
   static bool strictEquals(Runtime& runtime, const Object& a, const Object& b) {
     return runtime.strictEquals(a, b);

packages/react-native/ReactCommon/jsi/jsi/test/testlib.cpp

@@ -1635,6 +1635,27 @@ TEST_P(JSITest, UTF16Test) {
   EXPECT_EQ(str.utf16(rd), u"\uFFFD\u007A");
 }
 
+TEST_P(JSITest, ObjectCreateWithPrototype) {
+  // This Runtime Decorator is used to test the default implementation of
+  // Object.create(prototype)
+  class RD : public RuntimeDecorator<Runtime, Runtime> {
+   public:
+    RD(Runtime& rt) : RuntimeDecorator(rt) {}
+
+    Object createObjectWithPrototype(const Object& prototype) override {
+      return Runtime::createObjectWithPrototype(prototype);
+    }
+  };
+
+  RD rd = RD(rt);
+  Object prototype(rd);
+
+  prototype.setProperty(rd, "someProperty", 123);
+
+  Object child = rd.createObjectWithPrototype(prototype);
+  EXPECT_EQ(child.getProperty(rd, "someProperty").getNumber(), 123);
+}
+
 INSTANTIATE_TEST_CASE_P(
     Runtimes,
     JSITest,