Post slack when submitting Google Forms, If so, set configuration variables. And set a script trigger

SubmitSlackGoogleForm.gs

const SLACK_WEBHOOK_URL = YOUR_SLACK_WEBOOK_URL;
const CHANNEL = "#xxxx";
const USER_NAME = "bot name";

function submitForm(e) {
  const itemResponses = e.response.getItemResponses();
  const messages = [];

  for (let item of itemResponses) {
    const question = item.getItem().getTitle();
    const answer = item.getResponse();

    messages.push(question + ": " + answer + "\n");
  }

  sendToSlack(messages.join(""));
}

function sendToSlack(text) {
  const data = {
    channel: CHANNEL,
    username: USER_NAME,
    text,
    icon_emoji: ":sneezing_face: "
  };

  const options = {
    method: "POST",
    contentType: "application/json",
    payload: JSON.stringify(data)
  };

  UrlFetchApp.fetch(SLACK_WEBHOOK_URL, options);
}