diff --git a/packages/dashql-app/src/platform/native_grpc_client.ts b/packages/dashql-app/src/platform/native_grpc_client.ts
index acea08ef1..e39b1c66c 100644
--- a/packages/dashql-app/src/platform/native_grpc_client.ts
+++ b/packages/dashql-app/src/platform/native_grpc_client.ts
@@ -246,7 +246,7 @@ export class NativeGrpcChannel {
         const request = new Request(url, {
             method: 'POST',
             headers,
-            body: args.body,
+            body: args.body as BodyInit,
         });
         const response = await fetch(request);
         await throwIfError(response);
diff --git a/packages/dashql-app/src/platform/native_http_client.ts b/packages/dashql-app/src/platform/native_http_client.ts
index b937e0603..05db3d077 100644
--- a/packages/dashql-app/src/platform/native_http_client.ts
+++ b/packages/dashql-app/src/platform/native_http_client.ts
@@ -184,7 +184,7 @@ export class NativeHttpClient implements HttpClient {
         this.logger.debug(`fetch http stream`, { "remote": remote, "path": input?.toString() }, "native_http_client");
 
         const body: any = init?.body;
-        let bodyBuffer: ArrayBuffer;
+        let bodyBuffer: ArrayBuffer | Uint8Array;
         if (init?.body) {
             if (init.body instanceof ArrayBuffer) {
                 bodyBuffer = init.body;
diff --git a/packages/dashql-app/src/platform/web_file_downloader.ts b/packages/dashql-app/src/platform/web_file_downloader.ts
index f243b4510..c47e67386 100644
--- a/packages/dashql-app/src/platform/web_file_downloader.ts
+++ b/packages/dashql-app/src/platform/web_file_downloader.ts
@@ -3,7 +3,7 @@ import { FileDownloader } from './file_downloader.js';
 export class WebFileDownloader implements FileDownloader {
     async downloadBufferAsFile(uint8Array: Uint8Array, filename: string): Promise<void> {
         // Create a Blob from the Uint8Array
-        const blob = new Blob([uint8Array], { type: 'application/octet-stream' });
+        const blob = new Blob([uint8Array as BlobPart], { type: 'application/octet-stream' });
         // Create a temporary URL for the Blob
         const url = URL.createObjectURL(blob);
         // Create an anchor element and trigger the download