How to use the firebase-functions.crashlytics function in firebase-functions

// Uses Basic Authentication
  // Jira Doc: https://developer.atlassian.com/jiradev/jira-apis/jira-rest-apis/jira-rest-api-tutorials/jira-rest-api-example-basic-authentication
  // Request (Promise) Doc: https://github.com/request/request#http-authentication
  return rp({
    auth: {
      'user': user,
      'pass': pass
    },
    method: 'POST',
    uri: url,
    body: newIssue,
    json: true
  });
};

exports.createNewIssue = functions.crashlytics.issue().onNewDetected(event => {
  const data = event.data;

  const issueId = data.issueId;
  const issueTitle = data.issueTitle;
  const appName = data.appInfo.appName;
  const appId = data.appInfo.appId;
  const appPlatform = data.appInfo.appPlatform;
  const latestAppVersion = data.appInfo.latestAppVersion;

  const summary = `New Issue - ${issueId} in ${appName} on $(appPlatform)`;
  const description = `There is a new issue - ${issueTitle} in ${appId}, ` +
      `version ${latestAppVersion}`;
  const priority = calculateIssuePriority();
  return createJiraIssue(summary, description, priority).then(() => {
    console.log(`Created issue ${issueId} in Jira successfully`);
  });

// Helper function that posts to Slack about the new issue
function notifySlack(slackMessage) {
  // See https://api.slack.com/docs/message-formatting on how
  // to customize the message payload
  return rp({
    method: 'POST',
    uri: functions.config().slack.webhook_url,
    body: {
      text: slackMessage,
    },
    json: true,
  });
}

exports.postOnNewIssue = functions.crashlytics.issue().onNew(async (issue) => {
  const issueId = issue.issueId;
  const issueTitle = issue.issueTitle;
  const appName = issue.appInfo.appName;
  const appPlatform = issue.appInfo.appPlatform;
  const latestAppVersion = issue.appInfo.latestAppVersion;

  const slackMessage = ` There is a new issue - ${issueTitle} (${issueId}) ` +
      `in ${appName}, version ${latestAppVersion} on ${appPlatform}`;

  await notifySlack(slackMessage);
  console.log(`Posted new issue ${issueId} successfully to Slack`);
});

exports.postOnRegressedIssue = functions.crashlytics.issue().onRegressed(async (issue) => {
  const issueId = issue.issueId;
  const issueTitle = issue.issueTitle;

*
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';

const functions = require('firebase-functions'),
      sendgridMail = require('@sendgrid/mail');

// Authentication for the SendGrid account
sendgridMail.setApiKey(functions.config().sendgrid.api_key);

exports.sendOnNewIssue = functions.crashlytics.issue().onNewDetected(event => {
  const data = event.data;

  const issueId = data.issueId;
  const issueTitle = data.issueTitle;
  const appName = data.appInfo.appName;
  const appId = data.appInfo.appId;
  const appPlatform = data.appInfo.appPlatform;
  const latestAppVersion = data.appInfo.latestAppVersion;
  const createTime = data.createTime;

  const emailDetails = {
    to: functions.config().email.destination_email,
    from: functions.config().email.from_email,
    subject: `${appName} on ${appPlatform} has a new issue`,
    html: `<h2>${appName} on ${appPlatform} has a new issue!</h2>
        <p>App Name: ${appName}</p>

<p>App Id: ${appId}</p>
        <p>Platform: ${appPlatform}</p>
        <p>Version: ${latestAppVersion}</p>
        <p>Issue Id: ${issueId}</p>
        <p>Issue Title: ${issueTitle}</p>
        <p>Creation Time: ${createTime}</p>`
  };

  return sendgridMail.send(emailDetails).then(() =&gt; {
    console.log('Successfully sent new issue email');
  }).catch(error =&gt; {
    console.error(error.toString());
  });
});

exports.sendOnRegressedIssue = functions.crashlytics.issue().onRegressed(event =&gt; {
  const data = event.data;

  const issueId = data.issueId;
  const issueTitle = data.issueTitle;
  const appName = data.appInfo.appName;
  const appId = data.appInfo.appId;
  const appPlatform = data.appInfo.appPlatform;
  const latestAppVersion = data.appInfo.latestAppVersion;
  const createTime = data.createTime;
  const resolvedTime = data.resolvedTime;

  const emailDetails = {
    to: functions.config().email.destination_email,
    from: functions.config().email.from_email,
    subject: `${appName} on ${appPlatform} has a regressed issue`,
    html: `<h2>${appName} on ${appPlatform} has a regressed issue!</h2>

const issueTitle = data.issueTitle;
  const appName = data.appInfo.appName;
  const appId = data.appInfo.appId;
  const appPlatform = data.appInfo.appPlatform;
  const latestAppVersion = data.appInfo.latestAppVersion;

  const summary = `New Issue - ${issueId} in ${appName} on $(appPlatform)`;
  const description = `There is a new issue - ${issueTitle} in ${appId}, ` +
      `version ${latestAppVersion}`;
  const priority = calculateIssuePriority();
  return createJiraIssue(summary, description, priority).then(() => {
    console.log(`Created issue ${issueId} in Jira successfully`);
  });
});

exports.createRegressedIssue = functions.crashlytics.issue().onRegressed(event => {
  const data = event.data;

  const issueId = data.issueId;
  const issueTitle = data.issueTitle;
  const appName = data.appInfo.appName;
  const appId = data.appInfo.appId;
  const appPlatform = data.appInfo.appPlatform;
  const latestAppVersion = data.appInfo.latestAppVersion;
  const resolvedTime = data.resolvedTime;

  const summary = `Regressed Issue - ${issueId} in ${appName} on $(appPlatform)`;
  const description = `There is a regressed issue - ${issueTitle} in ${appId}, ` +
      `version ${latestAppVersion}. This issue was previously resolved at ` +
      `${new Date(resolvedTime).toString()}`;
  const priority = calculateIssuePriority('regressed');
  return createJiraIssue(summary, description, priority).then(() => {

const issueId = issue.issueId;
  const issueTitle = issue.issueTitle;
  const appName = issue.appInfo.appName;
  const appPlatform = issue.appInfo.appPlatform;
  const latestAppVersion = issue.appInfo.latestAppVersion;
  const resolvedTime = issue.resolvedTime;

  const slackMessage = ` There is a regressed issue ${issueTitle} (${issueId}) ` +
      `in ${appName}, version ${latestAppVersion} on ${appPlatform}. This issue was previously ` +
      `resolved at ${new Date(resolvedTime).toString()}`;

  await notifySlack(slackMessage);
  console.log(`Posted regressed issue ${issueId} successfully to Slack`);
});

exports.postOnVelocityAlert = functions.crashlytics.issue().onVelocityAlert(async (issue) => {
  const issueId = issue.issueId;
  const issueTitle = issue.issueTitle;
  const appName = issue.appInfo.appName;
  const appPlatform = issue.appInfo.appPlatform;
  const latestAppVersion = issue.appInfo.latestAppVersion;
  const crashPercentage = issue.velocityAlert.crashPercentage;

  const slackMessage = ` There is an issue ${issueTitle} (${issueId}) ` +
      `in ${appName}, version ${latestAppVersion} on ${appPlatform} that is causing ` +
      `${parseFloat(crashPercentage).toFixed(2)}% of all sessions to crash.`;

  await notifySlack(slackMessage);
  console.log(`Posted velocity alert ${issueId} successfully to Slack`);
});