From ffdfbbec08b1afb1970d2cfe75a78a203d4a79a4 Mon Sep 17 00:00:00 2001
From: Peter Argany <petetheheat@fb.com>
Date: Fri, 7 Aug 2020 11:53:58 -0700
Subject: [PATCH] Support bridgeless in RCTEventDispatcher

Summary:
This ties the stack together, utilizes new TM functionality to avoid using the bridge in `RCTEventDispatcher`.

Changelog: [Internal]

Differential Revision: D22962320

fbshipit-source-id: de4e001a4a6ce232c37d7feed1e0c0d1d70a80f8
---
 React/Base/RCTEventDispatcher.h |  3 +-
 React/Base/RCTEventDispatcher.m | 49 +++++++++++++++++++++++----------
 2 files changed, 37 insertions(+), 15 deletions(-)

diff --git a/React/Base/RCTEventDispatcher.h b/React/Base/RCTEventDispatcher.h
index dd00be3aaa1..dfaba98c2cf 100644
--- a/React/Base/RCTEventDispatcher.h
+++ b/React/Base/RCTEventDispatcher.h
@@ -8,6 +8,7 @@
 #import <UIKit/UIKit.h>
 
 #import <React/RCTBridge.h>
+#import <React/RCTJSInvokerModule.h>
 
 typedef NS_ENUM(NSInteger, RCTTextEventType) {
   RCTTextEventTypeFocus,
@@ -79,7 +80,7 @@ RCT_EXTERN NSString *RCTNormalizeInputEventName(NSString *eventName);
  * This class wraps the -[RCTBridge enqueueJSCall:args:] method, and
  * provides some convenience methods for generating event calls.
  */
-@interface RCTEventDispatcher : NSObject <RCTBridgeModule>
+@interface RCTEventDispatcher : NSObject <RCTBridgeModule, RCTJSDispatcherModule, RCTJSInvokerModule>
 
 /**
  * Deprecated, do not use.
diff --git a/React/Base/RCTEventDispatcher.m b/React/Base/RCTEventDispatcher.m
index 3da2e268ed7..2930fa855ee 100644
--- a/React/Base/RCTEventDispatcher.m
+++ b/React/Base/RCTEventDispatcher.m
@@ -48,6 +48,9 @@ static uint16_t RCTUniqueCoalescingKeyGenerator = 0;
 }
 
 @synthesize bridge = _bridge;
+@synthesize dispatchToJSThread = _dispatchToJSThread;
+@synthesize invokeJS = _invokeJS;
+@synthesize invokeJSWithModuleDotMethod = _invokeJSWithModuleDotMethod;
 
 RCT_EXPORT_MODULE()
 
@@ -64,18 +67,26 @@ RCT_EXPORT_MODULE()
 
 - (void)sendAppEventWithName:(NSString *)name body:(id)body
 {
-  [_bridge enqueueJSCall:@"RCTNativeAppEventEmitter"
-                  method:@"emit"
-                    args:body ? @[ name, body ] : @[ name ]
-              completion:NULL];
+  if (_bridge) {
+    [_bridge enqueueJSCall:@"RCTNativeAppEventEmitter"
+                    method:@"emit"
+                      args:body ? @[ name, body ] : @[ name ]
+                completion:NULL];
+  } else {
+    _invokeJS(@"RCTNativeAppEventEmitter", @"emit", body ? @[ name, body ] : @[ name ]);
+  }
 }
 
 - (void)sendDeviceEventWithName:(NSString *)name body:(id)body
 {
-  [_bridge enqueueJSCall:@"RCTDeviceEventEmitter"
-                  method:@"emit"
-                    args:body ? @[ name, body ] : @[ name ]
-              completion:NULL];
+  if (_bridge) {
+    [_bridge enqueueJSCall:@"RCTDeviceEventEmitter"
+                    method:@"emit"
+                      args:body ? @[ name, body ] : @[ name ]
+                completion:NULL];
+  } else {
+    _invokeJS(@"RCTDeviceEventEmitter", @"emit", body ? @[ name, body ] : @[ name ]);
+  }
 }
 
 - (void)sendTextEventWithType:(RCTTextEventType)type
@@ -162,11 +173,17 @@ RCT_EXPORT_MODULE()
   [_eventQueueLock unlock];
 
   if (scheduleEventsDispatch) {
-    [_bridge
-        dispatchBlock:^{
-          [self flushEventsQueue];
-        }
-                queue:RCTJSThread];
+    if (_bridge) {
+      [_bridge
+          dispatchBlock:^{
+            [self flushEventsQueue];
+          }
+                  queue:RCTJSThread];
+    } else {
+      _dispatchToJSThread(^{
+        [self flushEventsQueue];
+      });
+    }
   }
 }
 
@@ -186,7 +203,11 @@ RCT_EXPORT_MODULE()
 
 - (void)dispatchEvent:(id<RCTEvent>)event
 {
-  [_bridge enqueueJSCall:[[event class] moduleDotMethod] args:[event arguments]];
+  if (_bridge) {
+    [_bridge enqueueJSCall:[[event class] moduleDotMethod] args:[event arguments]];
+  } else {
+    _invokeJSWithModuleDotMethod([[event class] moduleDotMethod], [event arguments]);
+  }
 }
 
 - (dispatch_queue_t)methodQueue