Fix

packages/reffuse/src/ReffuseContext.tsx

@@ -51,11 +51,9 @@ export function make<R = never>() {
     return new ReffuseContext<R>()
 }
 
-export function useMergeAll<
-    const Contexts extends readonly ReffuseContext<any>[]
->(
-    ...contexts: Contexts
-): Context.Context<{ [K in keyof Contexts]: R<Contexts[K]> }[number]> {
+export function useMergeAll<T extends Array<unknown>>(
+    ...contexts: [...{ [K in keyof T]: ReffuseContext<T[K]> }]
+): Context.Context<T[number]> {
     const values = contexts.map(v => React.use(v.Context))
     return React.useMemo(() => Context.mergeAll(...values), values)
 }
@@ -71,3 +69,7 @@ export function useMergeAllLayers<
         ...Array.map(values, context => Layer.effectContext(Effect.succeed(context)))
     ) as Layer.Layer<any>, values)
 }
+
+declare const context1: ReffuseContext<never>
+declare const context2: ReffuseContext<"prout">
+const res = useMergeAll(context1, context2)