@microsoft-github-policy-service agree

When using fetch-event-source in the webview of iOS or Android, it is important to note that the fetch method is not implemented as native code. Instead, it is a polyfill that provides functionality similar to the native fetch method. One specific difference is that the polyfill does not have a response with a body of type ReadableStream. Considering this limitation is therefore crucial in such cases.

your code may cause repeated fetch requests. I adjusted it.

export async function getBytes(response: Response, onChunk: (arr: Uint8Array) => void) {
 const reader = response.body?.getReader();
 if (reader) {
 let result;
 while (!(result = await reader.read()).done) {
 onChunk(result.value);
 }
 } else {
 onChunk(new Uint8Array(await response.arrayBuffer()));
 }
}