diff --git a/packages/next/build/entries.ts b/packages/next/build/entries.ts
index 499c3ed9837b..17a38a1394ed 100644
--- a/packages/next/build/entries.ts
+++ b/packages/next/build/entries.ts
@@ -105,7 +105,7 @@ type Entrypoints = {
 
 export async function getPageRuntime(
   pageFilePath: string,
-  globalRuntime: string | undefined
+  globalRuntime?: string
 ) {
   let pageRuntime: string | undefined = undefined
   const pageContent = await fs.promises.readFile(pageFilePath, {
diff --git a/packages/next/build/swc/index.d.ts b/packages/next/build/swc/index.d.ts
index 5ad9312eb520..779b53084a45 100644
--- a/packages/next/build/swc/index.d.ts
+++ b/packages/next/build/swc/index.d.ts
@@ -1,6 +1,6 @@
 export function isWasm(): Promise<boolean>
-export function transform(src: string, options: any): Promise<string>
-export function transformSync(src: string, options: any): string
+export function transform(src: string, options?: any): Promise<any>
+export function transformSync(src: string, options?: any): any
 export function minify(src: string, options: any): Promise<string>
 export function minifySync(src: string, options: any): string
 export function bundle(options: any): Promise<any>