refactor: remove default exports for consistency

Author: mpeyper

src/core/asyncUtils.ts

@@ -95,4 +95,4 @@ function asyncUtils(act: Act, addResolver: (callback: () => void) => void): Asyn
   }
 }
 
-export default asyncUtils
+export { asyncUtils }

src/core/index.ts

@@ -1,7 +1,7 @@
 import { CreateRenderer, Renderer, RenderResult, RenderHook, RenderHookOptions } from '../types'
 import { ResultContainer } from '../types/internal'
 
-import asyncUtils from './asyncUtils'
+import { asyncUtils } from './asyncUtils'
 import { cleanup, addCleanup, removeCleanup } from './cleanup'
 
 function resultContainer<TValue>(): ResultContainer<TValue> {