fix: return function instead of promise from withUniwindConfig

Author: Brentlok

packages/uniwind/src/metro/index.d.ts

@@ -11,4 +11,4 @@ type UniwindConfig = {
     polyfills?: Polyfills
 }
 
-export declare function withUniwindConfig(config: MetroConfig, options: UniwindConfig): Promise<MetroConfig>
+export declare function withUniwindConfig(config: MetroConfig, options: UniwindConfig): () => Promise<MetroConfig>

packages/uniwind/src/metro/withUniwindConfig.ts

@@ -20,10 +20,11 @@ const getPlatformFromVirtualPath = (path: string) => {
 
 const platforms = [Platform.iOS, Platform.Android, Platform.Web]
 
-export const withUniwindConfig = async (
+export const withUniwindConfig = (
     config: MetroConfig,
     uniwindConfig: UniwindConfig,
-): Promise<MetroConfig> => {
+) =>
+async (): Promise<MetroConfig> => {
     if (!fs.existsSync(cacheDir)) {
         fs.mkdirSync(cacheDir)
     }