Can't log an analytics event on Firebase Cloud Function

I want to add analytics events when the user make a post on the app on Firebase Cloud Function.

The error:

TypeError: functions.analytics.logEvent is not a function

The code:

const functions = require("firebase-functions");
const firestore = require("@google-cloud/firestore");

exports.userPosts = functions.firestore
  .document("posts/{postId}")
  .onUpdate((change, context) => {
    const data = change.after.data();
    const { name, uid } = data;

    functions.analytics.logEvent("make_post", {
      name: name,
      uid: uid,
    });
   }