response.text() returns empty string on streamed responses

[abdelkd]

Description of the bug:

After generating content using generateContentStream or chat.sendMessageStream the response.text() returns empty string

Actual vs expected behavior:

Actual Behavior

import { GenerativeModel, GoogleGenerativeAI } from '@google/generative-ai';

const MODEL = "gemini-1.5-flash"
/** @type {GenerativeModel | undefined} */
let cachedModel = undefined;

/**
  * @returns {GenerativeModel}
  */
function getModel() {
  if (cachedModel !== undefined) return cachedModel;

  const genAI = new GoogleGenerativeAI(process.env.GOOGLE_API_KEY)
  cachedModel = genAI.getGenerativeModel({
    model: MODEL,
    systemInstruction: "You are a helpful assistant"
  })

  return cachedModel;
}

async function testSendMessageStream() {
  const model = getModel()
  const chat = model.startChat()

  const res = model.generateContentStream("Hello, How're you?")
  console.log((await (await res).response).text()) // empty string

  let response = await chat.sendMessageStream("Hello, How are you?")
  response = await chat.sendMessageStream("What was my last question?")
  console.log((await response.response).text()) // also empty string
}

async function test() {
  await testSendMessageStream()
}

test()

Expected Behavior

The expected behavior is that text function should return the actual generated response.

Any other information you'd like to share?

No response