fix(SequentialHandler): downlevel ECONNRESET errors (#8785)

packages/rest/src/lib/utils/utils.ts

@@ -135,3 +135,16 @@ export async function resolveBody(body: RequestInit['body']): Promise<RequestOpt
 
 	throw new TypeError(`Unable to resolve body.`);
 }
+
+/**
+ * Check whether an error indicates that a retry can be attempted
+ *
+ * @param error - The error thrown by the network request
+ * @returns Whether the error indicates a retry should be attempted
+ */
+export function shouldRetry(error: Error | NodeJS.ErrnoException) {
+	// Retry for possible timed out requests
+	if (error.name === 'AbortError') return true;
+	// Downlevel ECONNRESET to retry as it may be recoverable
+	return ('code' in error && error.code === 'ECONNRESET') || error.message.includes('ECONNRESET');
+}