Fix

packages/reffuse/src/Reffuse.ts

@@ -19,7 +19,7 @@ export class Reffuse<
     ) {
         this.Provider = parent
             ? ReffuseReactContext.makeNestedProvider(runtime, this.Context, parent)
-            : ReffuseReactContext.makeRootProvider<RuntimeR, OwnContextR>(runtime, this.Context)
+            : ReffuseReactContext.makeRootProvider(runtime, this.Context)
     }
 
 

packages/reffuse/src/ReffuseReactContext.tsx

@@ -24,15 +24,21 @@ export interface ProviderProps<
     readonly children?: React.ReactNode
 }
 
-export function makeRootProvider<RuntimeR, ContextR>(
+export function makeRootProvider<
+    RuntimeR,
+    ContextR extends ParentContextR | OwnContextR,
+    OwnContextR,
+    ParentContextR,
+>(
     runtime: Runtime.Runtime<RuntimeR>,
     ReactContext: React.Context<Value<RuntimeR, ContextR>>,
-): Provider<RuntimeR, ContextR, never> {
+): Provider<RuntimeR, OwnContextR, ParentContextR> {
     return function ReffuseRootReactContextProvider(props) {
         const value = React.useMemo(() => ({
             runtime,
             context: Effect.context<ContextR>().pipe(
                 Effect.provide(props.layer),
+                Effect.provide(Context.empty() as Context.Context<ParentContextR>), // Just there for type safety. ParentContextR is always never here anyway
                 Runtime.runSync(runtime),
             ),
         }), [props.layer])