fix(client): correctly handle errors during streaming (#379)

src/streaming.ts

@@ -1,6 +1,8 @@
 import { ReadableStream, type Response } from './_shims/index';
 import { OpenAIError } from './error';
 
+import { APIError } from 'openai/error';
+
 type Bytes = string | ArrayBuffer | Uint8Array | Buffer | null | undefined;
 
 type ServerSentEvent = {
@@ -58,13 +60,21 @@ export class Stream<Item> implements AsyncIterable<Item> {
           }
 
           if (sse.event === null) {
+            let data;
+
             try {
-              yield JSON.parse(sse.data);
+              data = JSON.parse(sse.data);
             } catch (e) {
               console.error(`Could not parse message into JSON:`, sse.data);
               console.error(`From chunk:`, sse.raw);
               throw e;
             }
+
+            if (data && data.error) {
+              throw new APIError(undefined, data.error, undefined, undefined);
+            }
+
+            yield data;
           }
         }
         done = true;