[Flight] Don't serialize toJSON in Debug path and omit wide arrays (facebook#34759)

There's a couple of issues with serializing Buffer in the debug renders.

For one, the Node.js Buffer has a `toJSON` on it which turns the binary
data into a JSON array which is very inefficient to serialize compared
to the real buffer. For debug info we never really want to resolve these
and unlike the regular render we can't error. So this uses the trick
where we read the original value. It's still unfortunate that this
intermediate gets created at all but at least now we're not serializing
it.

Second, we have a limit on depth of objects but we didn't have a limit
on width like large arrays or typed arrays. This omits large arrays from
the payload when possible and make them deferred when there's a debug
channel.

Author: sebmarkbage

packages/react-server/src/ReactFlightServer.js

@@ -849,6 +849,49 @@ export function resolveRequest(): null | Request {
   return null;
 }
 
+function isTypedArray(value: any): boolean {
+  if (value instanceof ArrayBuffer) {
+    return true;
+  }
+  if (value instanceof Int8Array) {
+    return true;
+  }
+  if (value instanceof Uint8Array) {
+    return true;
+  }
+  if (value instanceof Uint8ClampedArray) {
+    return true;
+  }
+  if (value instanceof Int16Array) {
+    return true;
+  }
+  if (value instanceof Uint16Array) {
+    return true;
+  }
+  if (value instanceof Int32Array) {
+    return true;
+  }
+  if (value instanceof Uint32Array) {
+    return true;
+  }
+  if (value instanceof Float32Array) {
+    return true;
+  }
+  if (value instanceof Float64Array) {
+    return true;
+  }
+  if (value instanceof BigInt64Array) {
+    return true;
+  }
+  if (value instanceof BigUint64Array) {
+    return true;
+  }
+  if (value instanceof DataView) {
+    return true;
+  }
+  return false;
+}
+
 function serializeDebugThenable(
   request: Request,
   counter: {objectLimit: number},
@@ -906,6 +949,17 @@ function serializeDebugThenable(
         enqueueFlush(request);
         return;
       }
+      if (
+        (isArray(value) && value.length > 200) ||
+        (isTypedArray(value) && value.byteLength > 1000)
+      ) {
+        // If this should be deferred, but we don't have a debug channel installed
+        // it would get omitted. We can't omit outlined models but we can avoid
+        // resolving the Promise at all by halting it.
+        emitDebugHaltChunk(request, id);
+        enqueueFlush(request);
+        return;
+      }
       emitOutlinedDebugModelChunk(request, id, counter, value);
       enqueueFlush(request);
     },
@@ -3066,6 +3120,10 @@ function serializeDebugTypedArray(
   tag: string,
   typedArray: $ArrayBufferView,
 ): string {
+  if (typedArray.byteLength > 1000 && !doNotLimit.has(typedArray)) {
+    // Defer large typed arrays.
+    return serializeDeferredObject(request, typedArray);
+  }
   request.pendingDebugChunks++;
   const bufferId = request.nextChunkId++;
   emitTypedArrayChunk(request, bufferId, tag, typedArray, true);
@@ -4820,9 +4878,17 @@ function renderDebugModel(
     }
 
     if (isArray(value)) {
+      if (value.length > 200 && !doNotLimit.has(value)) {
+        // Defer large arrays. They're heavy to serialize.
+        // TODO: Consider doing the same for objects with many properties too.
+        return serializeDeferredObject(request, value);
+      }
       return value;
     }
 
+    if (value instanceof Date) {
+      return serializeDate(value);
+    }
     if (value instanceof Map) {
       return serializeDebugMap(request, counter, value);
     }
@@ -4930,15 +4996,6 @@ function renderDebugModel(
   }
 
   if (typeof value === 'string') {
-    if (value[value.length - 1] === 'Z') {
-      // Possibly a Date, whose toJSON automatically calls toISOString
-      // Make sure that `parent[parentPropertyName]` wasn't JSONified before `value` was passed to us
-      // $FlowFixMe[incompatible-use]
-      const originalValue = parent[parentPropertyName];
-      if (originalValue instanceof Date) {
-        return serializeDateFromDateJSON(value);
-      }
-    }
     if (value.length >= 1024) {
       // Large strings are counted towards the object limit.
       if (counter.objectLimit <= 0) {
@@ -5036,10 +5093,6 @@ function renderDebugModel(
     return serializeBigInt(value);
   }
 
-  if (value instanceof Date) {
-    return serializeDate(value);
-  }
-
   return 'unknown type ' + typeof value;
 }
 
@@ -5058,12 +5111,15 @@ function serializeDebugModel(
     value: ReactClientValue,
   ): ReactJSONValue {
     try {
+      // By-pass toJSON and use the original value.
+      // $FlowFixMe[incompatible-use]
+      const originalValue = this[parentPropertyName];
       return renderDebugModel(
         request,
         counter,
         this,
         parentPropertyName,
-        value,
+        originalValue,
       );
     } catch (x) {
       return (
@@ -5114,12 +5170,15 @@ function emitOutlinedDebugModelChunk(
     value: ReactClientValue,
   ): ReactJSONValue {
     try {
+      // By-pass toJSON and use the original value.
+      // $FlowFixMe[incompatible-use]
+      const originalValue = this[parentPropertyName];
       return renderDebugModel(
         request,
         counter,
         this,
         parentPropertyName,
-        value,
+        originalValue,
       );
     } catch (x) {
       return (