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<?php

class Db
{
    public function batchInsert($table, array $rows, array $columns = array())
    {
        // Is array empty? Nothing to insert!
        if (empty($rows)) {
            return true;
        }

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npm install -g npm-check-updates
ncu -u
npm update
npm install

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If you ever get into out-of-sync trouble, clear your working tree on your fork (git add && git commit && git push) and 
run the following: 

git checkout master 
// git fetch upstream (add this for a slightly safer solution)
git reset --hard upstream/master
git push --force

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React Firebase Check List (Revision 1.0):
 
Dependencies:
i) Node and NPM
ii) firebase-tools
iii) VSCode

This checklist is suitable for you if:
i) You use Windows operating system.
ii) You use ReactJS as your development library and Firebase as your BaaS.

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// Allow read/write access on all documents to any user signed in to the application
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if request.auth != null;
    } 
  }
}

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db.collection("users").get().then((querySnapshot) => {
  querySnapshot.forEach((doc) => {
    console.log(`${doc.id} => ${doc.data()}`);
  });
});

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//  Add a first document with a generated ID.
db.collection("users").add({
  first: "Ada",
  last: "Lovelace",
  born: 1815
})
.then((docRef) => {
  console.log("Document written with ID: ", docRef.id);
})
.catch((error) => {

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// Asynchronous Function Callback

function loadAsset(url, cb) {
  let xhr = new XMLHttpRequest();
  xhr.open("GET", url);

  xhr.addEventListener("readystatechange", () => {
    if (xhr.readyState === 4 && xhr.status === 200) {
      cb(undefined, JSON.parse(xhr.responseText));
    } else if (xhr.readyState === 4) {

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fetch("https://jsonplaceholder.typicode.com/todos/")
            .then((response) => response.json())
            .then(data => { 
                console.log(data) 
            })
            .catch((err) => {
                console.log('rejected', err)
            })

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function getTodos(resource) {
            return new Promise((resolve, reject) => {
                const request = new XMLHttpRequest();

                request.addEventListener("readystatechange", () => {
                    if (request.readyState === 4 && request.status === 200) {
                        resolve(request.responseText);
                    } else if (request.readyState === 4) {
                        reject("Error getting resource");
                    }