Add JSI<->C++ bridging conversion for folly::dynamic

packages/react-native/ReactCommon/react/bridging/Bridging.h

@@ -11,6 +11,7 @@
 #include <react/bridging/Array.h>
 #include <react/bridging/Bool.h>
 #include <react/bridging/Class.h>
+#include <react/bridging/Dynamic.h>
 #include <react/bridging/Error.h>
 #include <react/bridging/Function.h>
 #include <react/bridging/Number.h>

packages/react-native/ReactCommon/react/bridging/Dynamic.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <folly/dynamic.h>
+#include <jsi/JSIDynamic.h>
+
+namespace facebook::react {
+
+template <>
+struct Bridging<folly::dynamic> {
+  static folly::dynamic fromJs(jsi::Runtime &rt, const jsi::Value &value) {
+    return jsi::dynamicFromValue(rt, value);
+  }
+
+  static jsi::Value toJs(jsi::Runtime &rt, const folly::dynamic &value) {
+    return jsi::valueFromDynamic(rt, value);
+  }
+};
+
+} // namespace facebook::react

packages/react-native/ReactCommon/react/bridging/tests/BridgingTest.cpp

@@ -532,4 +532,90 @@ TEST_F(BridgingTest, supportTest) {
   EXPECT_FALSE((bridging::supportsToJs<std::vector<int>, jsi::Function>));
 }
 
+TEST_F(BridgingTest, dynamicTest) {
+  // Null
+  auto nullFromJsResult =
+      bridging::fromJs<folly::dynamic>(rt, jsi::Value::null(), invoker);
+  EXPECT_TRUE(nullFromJsResult.isNull());
+
+  auto nullToJsResult = bridging::toJs<folly::dynamic>(rt, nullptr, invoker);
+  EXPECT_TRUE(nullToJsResult.isNull());
+
+  // Boolean
+  auto booleanFromJsResult =
+      bridging::fromJs<folly::dynamic>(rt, jsi::Value(true), invoker);
+  EXPECT_TRUE(booleanFromJsResult.isBool());
+  EXPECT_TRUE(booleanFromJsResult.asBool());
+
+  auto booleanToJsResult = bridging::toJs<folly::dynamic>(rt, true, invoker);
+  EXPECT_TRUE(booleanToJsResult.isBool());
+  EXPECT_TRUE(booleanToJsResult.asBool());
+
+  // Number
+  auto numberFromJsResult =
+      bridging::fromJs<folly::dynamic>(rt, jsi::Value(1.2), invoker);
+  EXPECT_TRUE(numberFromJsResult.isNumber());
+  EXPECT_DOUBLE_EQ(1.2, numberFromJsResult.asDouble());
+
+  auto numberToJsResult = bridging::toJs<folly::dynamic>(rt, 1.2, invoker);
+  EXPECT_TRUE(numberToJsResult.isNumber());
+  EXPECT_DOUBLE_EQ(1.2, numberToJsResult.asNumber());
+
+  // String
+  auto stringFromJsResult = bridging::fromJs<folly::dynamic>(
+      rt, jsi::Value(jsi::String::createFromAscii(rt, "hello")), invoker);
+  EXPECT_TRUE(stringFromJsResult.isString());
+  EXPECT_EQ("hello"s, stringFromJsResult.asString());
+
+  auto stringToJsResult = bridging::toJs<folly::dynamic>(rt, "hello", invoker);
+  EXPECT_TRUE(stringToJsResult.isString());
+  EXPECT_EQ("hello"s, stringToJsResult.asString(rt).utf8(rt));
+
+  // Array
+  auto arrayFromJsResult = bridging::fromJs<folly::dynamic>(
+      rt,
+      jsi::Value(jsi::Array::createWithElements(rt, "foo", "bar")),
+      invoker);
+  EXPECT_TRUE(arrayFromJsResult.isArray());
+  EXPECT_EQ(2, arrayFromJsResult.size());
+  EXPECT_EQ("foo"s, arrayFromJsResult[0].asString());
+  EXPECT_EQ("bar"s, arrayFromJsResult[1].asString());
+
+  auto arrayToJsResult = bridging::toJs<folly::dynamic>(
+      rt, folly::dynamic::array("foo", "bar"), invoker);
+  EXPECT_TRUE(arrayToJsResult.isObject());
+  EXPECT_TRUE(arrayToJsResult.asObject(rt).isArray(rt));
+  auto arrayToJsResultArray = arrayToJsResult.asObject(rt).asArray(rt);
+  EXPECT_EQ(2, arrayToJsResultArray.size(rt));
+  EXPECT_EQ(
+      "foo"s,
+      arrayToJsResultArray.getValueAtIndex(rt, 0).asString(rt).utf8(rt));
+  EXPECT_EQ(
+      "bar"s,
+      arrayToJsResultArray.getValueAtIndex(rt, 1).asString(rt).utf8(rt));
+
+  // Object
+  auto jsiObject = jsi::Object(rt);
+  jsiObject.setProperty(rt, "foo", "bar");
+  auto objectFromJsResult = bridging::fromJs<folly::dynamic>(
+      rt, jsi::Value(std::move(jsiObject)), invoker);
+
+  EXPECT_TRUE(objectFromJsResult.isObject());
+  EXPECT_EQ(1, objectFromJsResult.size());
+  EXPECT_EQ("bar"s, objectFromJsResult["foo"].asString());
+
+  auto objectToJsResult = bridging::toJs<folly::dynamic>(
+      rt, folly::dynamic::object("foo", "bar"), invoker);
+  EXPECT_TRUE(objectToJsResult.isObject());
+  auto objectToJsResultObject = objectToJsResult.asObject(rt);
+  EXPECT_EQ(
+      "bar"s,
+      objectToJsResultObject.getProperty(rt, "foo").asString(rt).utf8(rt));
+
+  // Undefined
+  auto undefinedFromJsResult =
+      bridging::fromJs<folly::dynamic>(rt, jsi::Value::undefined(), invoker);
+  EXPECT_TRUE(undefinedFromJsResult.isNull());
+}
+
 } // namespace facebook::react