Cloud Firestore を使って kintone へ プッシュ通知する https://blog.r3it.com/cloud-firestore-with-kintone-aaa50fcea1c7

firestore_basic.js

(function () {
  "use strict";

  firebase.initializeApp({
    apiKey: "XXxxXxXXXx99x9XX-xxx_xxXxXXXXXXxXXxXXxX",
    authDomain: "projectId.firebaseapp.com",
    projectId: "projectId"
  });

  // Initialize Cloud Firestore through Firebase
  var db = firebase.firestore();

  kintone.events.on("app.record.index.show", function (e) {

    db.collection("users").doc("user1").collection("documents")
      .onSnapshot(function (snapshot) {
        snapshot.forEach(function (doc) {
          var data = doc.data();
          console.log(doc.id, " => ", data["content"]);
        });
      }, function (error) {
        console.dir(error);
      });

  });

})();