Fix typing for parity with React

src/resultContainer.ts

@@ -1,7 +1,7 @@
 import { ResolverType } from "./_types";
 
-function resultContainer<R>(initialValue?: R) {
-  let value = initialValue;
+function resultContainer<R>() {
+  let value: R | undefined;
   let error: Error;
   const resolvers: ResolverType[] = [];
 
@@ -10,7 +10,7 @@ function resultContainer<R>(initialValue?: R) {
       if (error) {
         throw error;
       }
-      return value;
+      return value as R;
     },
     get error() {
       return error;

test/customHook.test.ts

@@ -15,17 +15,17 @@ describe("Custom hooks", () => {
     test("should increment counter", () => {
       const { result } = renderHook(() => useCounter());
 
-      act(() => result.current?.increment());
+      act(() => result.current.increment());
 
-      expect(result.current?.count).toBe(1);
+      expect(result.current.count).toBe(1);
     });
 
     test("should decrement counter", () => {
       const { result } = renderHook(() => useCounter());
 
-      act(() => result.current?.decrement());
+      act(() => result.current.decrement());
 
-      expect(result.current?.count).toBe(-1);
+      expect(result.current.count).toBe(-1);
     });
   });
 

test/useRef.test.ts

@@ -27,6 +27,6 @@ describe("useHook tests", () => {
 
     const refContainer = result.current;
 
-    expect(refContainer?.current?.fakeImperativeMethod()).toBe(true);
+    expect(refContainer.current?.fakeImperativeMethod()).toBe(true);
   });
 });