$U -> $undefined

facebook · Mar 9, 2023 · 9732259 · 9732259
1 parent 489ecc4
commit 9732259
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Showing 2 changed files with 3 additions and 2 deletions.
diff --git a/packages/react-client/src/ReactFlightClient.js b/packages/react-client/src/ReactFlightClient.js
@@ -556,7 +556,8 @@ export function parseModelString(
             throw chunk.reason;
         }
       }
-      case 'U': {
+      case 'u': {
+        // matches "$undefined"
         // Special encoding for `undefined` which can't be serialized as JSON otherwise.
         return undefined;
       }

diff --git a/packages/react-server/src/ReactFlightServer.js b/packages/react-server/src/ReactFlightServer.js
@@ -548,7 +548,7 @@ function serializeProviderReference(name: string): string {
 }
 
 function serializeUndefined(): string {
-  return '$U';
+  return '$undefined';
 }
 
 function serializeClientReference(