fix: use Response.arrayBuffer() in replace of FileReader

Author: AllanZhengYP

packages/fetch-http-handler/src/fetch-http-handler.spec.ts

@@ -40,7 +40,7 @@ describe("httpHandler", () => {
           ["bizz", "bazz"]
         ])
       },
-      blob: jest.fn().mockResolvedValue("")
+      body: "FOO" //should be a ReadableStream in real life.
     };
     const mockFetch = jest.fn().mockResolvedValue(mockResponse);
 
@@ -50,7 +50,7 @@ describe("httpHandler", () => {
     let response = await fetchHttpHandler.handle({} as any, {});
 
     expect(mockFetch.mock.calls.length).toBe(1);
-    expect(mockResponse.blob.mock.calls.length).toBe(1);
+    expect(response.response.body).toBe("FOO");
   });
 
   it("properly constructs url", async () => {
@@ -61,7 +61,7 @@ describe("httpHandler", () => {
           ["bizz", "bazz"]
         ])
       },
-      blob: jest.fn().mockResolvedValue("")
+      body: ""
     };
     const mockFetch = jest.fn().mockResolvedValue(mockResponse);
 

packages/stream-collector-browser/src/index.ts

@@ -3,14 +3,7 @@ import { StreamCollector } from "@aws-sdk/types";
 export const streamCollector: StreamCollector = (
   stream: ReadableStream
 ): Promise<Uint8Array> => {
-  const blobToArrayBuffer = (stream: Blob) =>
-    new Promise<Uint8Array>((resolve, reject) => {
-      const reader = new FileReader();
-      reader.onload = () =>
-        resolve(new Uint8Array(reader.result as ArrayBuffer));
-      reader.onabort = () => reject(new Error("Read aborted"));
-      reader.onerror = () => reject(reader.error);
-      reader.readAsArrayBuffer(stream);
-    });
-  return new Response(stream).blob().then(blobToArrayBuffer);
+  return new Response(stream)
+    .arrayBuffer()
+    .then(arrayBuffer => new Uint8Array(arrayBuffer));
 };