fix: Fix a race condition when handling multiple flag updates.

Author: kinyoklion

src/provider.tsx

@@ -57,16 +57,22 @@ class LDProvider extends Component<PropsWithChildren<ProviderConfig>, ProviderSt
     ldClient.on('change', (changes: LDFlagChangeset) => {
       const reactOptions = this.getReactOptions();
       const updates = getFlattenedFlagsFromChangeset(changes, targetFlags);
-      const unproxiedFlags = {
-        ...this.state.unproxiedFlags,
-        ...updates,
-      };
+
       if (Object.keys(updates).length > 0) {
-        this.setState((prevState) => ({
-          ...prevState,
-          unproxiedFlags,
-          ...getFlagsProxy(ldClient, unproxiedFlags, reactOptions, targetFlags),
-        }));
+        this.setState((prevState: ProviderState) => {
+          const unproxiedFlags = {
+            ...prevState.unproxiedFlags,
+            ...updates,
+          };
+          return {
+            ...prevState,
+            unproxiedFlags: {
+              ...prevState.unproxiedFlags,
+              ...updates,
+            },
+            ...getFlagsProxy(ldClient, unproxiedFlags, reactOptions, targetFlags),
+          }
+        });
       }
     });
   };