Fix

packages/effect-fc-next/src/ReactRuntime.ts

@@ -16,7 +16,7 @@ export interface ReactRuntime<R, ER> {
 
 const ReactRuntimePrototype = Object.freeze({ [ReactRuntimeTypeId]: ReactRuntimeTypeId } as const)
 
-export const preludeLayer: Layer.Layer<Component.ScopeMap> = Layer.mergeAll(Component.ScopeMap.layer)
+export const preludeLayer: Layer.Layer<Component.ScopeMap> = Component.ScopeMap.layer
 
 export const isReactRuntime = (u: unknown): u is ReactRuntime<unknown, unknown> => Predicate.hasProperty(u, ReactRuntimeTypeId)
 
@@ -26,11 +26,11 @@ export const make = <R, ER>(
 ): ReactRuntime<Layer.Success<typeof preludeLayer> | R, ER> => Object.setPrototypeOf(
     Object.assign(function() {}, {
         runtime: ManagedRuntime.make(
-            Layer.merge(layer, preludeLayer),
+            Layer.merge(preludeLayer, layer),
             { memoMap },
         ),
         // biome-ignore lint/style/noNonNullAssertion: context initialization
-        context: React.createContext<Context.Context<R>>(null!),
+        context: React.createContext<Context.Context<Layer.Success<typeof preludeLayer> | R>>(null!),
     }),
     ReactRuntimePrototype,
 )

packages/example-next/package.json

@@ -23,12 +23,12 @@
     "vite": "^8.0.16"
   },
   "dependencies": {
-    "effect": "4.0.0-beta.85",
+    "effect": "4.0.0-beta.98",
     "effect-fc-next": "workspace:*"
   },
   "overrides": {
     "@types/react": "^19.2.15",
-    "effect": "4.0.0-beta.85",
+    "effect": "4.0.0-beta.98",
     "react": "^19.2.6"
   }
 }