diff --git a/packages/reffuse/src/ReffuseExtension.ts b/packages/reffuse/src/ReffuseExtension.ts
index 84f6396..6d0648c 100644
--- a/packages/reffuse/src/ReffuseExtension.ts
+++ b/packages/reffuse/src/ReffuseExtension.ts
@@ -1,19 +1,10 @@
 import type { Effect } from "effect"
 import * as ReffuseContext from "./ReffuseContext.js"
+import * as Reffuse from "./Reffuse.js"
+import type { Simplify } from "effect/Types"
 
 
-interface ReffuseTest<R> {
-    readonly contexts: readonly ReffuseContext.ReffuseContext<R>[]
-
-    useEffect<A, E>(effect: Effect.Effect<A, E, R>): void
-}
-
-const ReffuseTestProto = {
-    useEffect<A, E, R>(this: ReffuseTest<R>, effect: Effect.Effect<A, E>) {}
-}
-
-const make = (): ReffuseTest<never> => {
-    const self = Object.create(ReffuseTestProto)
-    self.contexts = []
-    return self
-}
+const make = <T extends object>(extension: T) =>
+    <R extends typeof Reffuse.Reffuse>(base: R) => {
+        const class_ = class extends base {}
+    }
diff --git a/packages/reffuse/src/ReffuseHelper.ts b/packages/reffuse/src/ReffuseHelper.ts
new file mode 100644
index 0000000..d41f572
--- /dev/null
+++ b/packages/reffuse/src/ReffuseHelper.ts
@@ -0,0 +1,57 @@
+import type { Context, Effect, ExecutionStrategy, Fiber, Pipeable, Runtime, Scope, SubscriptionRef } from "effect"
+import type * as React from "react"
+
+
+export interface ReffuseHelper<R> extends Pipeable.Pipeable {
+    useContext(): Context.Context<R>
+
+    useRunSync(): <A, E>(effect: Effect.Effect<A, E, R>) => A
+    useRunPromise(): <A, E>(effect: Effect.Effect<A, E, R>, options?: {
+        readonly signal?: AbortSignal
+    }) => Promise<A>
+    useRunFork(): <A, E>(effect: Effect.Effect<A, E, R>, options?: Runtime.RunForkOptions) => Fiber.RuntimeFiber<A, E>
+    useRunCallback(): <A, E>(effect: Effect.Effect<A, E, R>, options?: Runtime.RunCallbackOptions<A, E>) => Runtime.Cancel<A, E>
+
+    useMemo<A, E>(
+        effect: Effect.Effect<A, E, R>,
+        deps?: React.DependencyList,
+        options?: RenderOptions,
+    ): A
+
+    useMemoScoped<A, E>(
+        effect: Effect.Effect<A, E, R | Scope.Scope>,
+        deps?: React.DependencyList,
+        options?: RenderOptions & ScopeOptions,
+    ): A
+
+    useLayoutEffect<A, E>(
+        effect: Effect.Effect<A, E, R | Scope.Scope>,
+        deps?: React.DependencyList,
+        options?: RenderOptions & ScopeOptions,
+    ): void
+
+    useFork<A, E>(
+        effect: Effect.Effect<A, E, R | Scope.Scope>,
+        deps?: React.DependencyList,
+        options?: Runtime.RunForkOptions & RenderOptions & ScopeOptions,
+    ): void
+
+    usePromise<A, E>(
+        effect: Effect.Effect<A, E, R | Scope.Scope>,
+        deps?: React.DependencyList,
+        options?: { readonly signal?: AbortSignal } & Runtime.RunForkOptions & RenderOptions & ScopeOptions,
+    ): Promise<A>
+
+    useRef<A>(value: A): SubscriptionRef.SubscriptionRef<A>
+    useRefState<A>(ref: SubscriptionRef.SubscriptionRef<A>): readonly [A, React.Dispatch<React.SetStateAction<A>>]
+}
+
+
+export interface RenderOptions {
+    /** Prevents re-executing the effect when the Effect runtime or context changes. Defaults to `false`. */
+    readonly doNotReExecuteOnRuntimeOrContextChange?: boolean
+}
+
+export interface ScopeOptions {
+    readonly finalizerExecutionStrategy?: ExecutionStrategy.ExecutionStrategy
+}