Function pull

packages/opencode/test/session/retry.test.ts:359–364

(controller)

          return new Response(
            new ReadableStream({
              async pull(controller) {
                controller.enqueue("Hello,")
                await sleep(10000)
                controller.enqueue(" World!")
                controller.close()
              },
            }),
            { headers: { "Content-Type": "text/plain" } },
          )