userEvent is more reliable and easy to use rather than fireEvent. userEvent provides wide range of browser events options and it is like interacting with events same as we interact in browser

Postgres query uses || as string concatenation instead of +

you can whitelist IPs and ranges in nginx. When we have separate virtual hosts these are saved in /etc/nginx/sites-enabled. The rules look like allow xx.xx.xx.xx/range(32); and deny all;. Further we can make sure nginx passes some headers to the app using the rules proxy_set_header Host $http_host;.

We can use the following where clause to filter users based on their age using a Postgres query (CURRENT_DATE - INTERVAL '18 years')::date < TO_DATE(T3.DATE_OF_BIRTH, 'YYYY-MM-DD')

As a Next.js app can be executed on both the server and the client side. When the app is rendered on the server, there is no access to the browser-specific features like localStorage, as it is a feature of the client-side browser environment.

So let's say, if we try to use localStorage in a Next.js app, we may encounter issues when the app is being server-side rendered.

To avoid this problem, we can check if localStorage is available before using it in our Next.js app.

if(typeoflocalStorage!== 'undefined') { 
// Use localStorage here
} 

This way, our app will only use localStorage when it is available, and avoid errors when it is not.

Bring the suspended server to foreground using fg command. Say the server is running and we want to install a package

1. Ctrl+Z
2. yarn add jsonwebtoken
3. fg

And the server resumes

We handle navigation in Gatsby using the Link Component. So if we put both external and internal links in the Link element, we receive the following warning in the console: External Link was detected in a link component. Use the link component only for internal links.

This is because the Link component is designed to interact with Gatsby's client-side navigation, which is better for single-page apps and uses the window.history API to update the URL without reloading the entire page.

So in case of external links, we should prefer a simple a tag and pass the href attribute.

Also gatsby prefetches the linked pages by starting a low priority request over a link, when we take the mouse on it onMouseOver, it makes the request high priority.

Difference between DOM element properties clientWidth clientHeight , offsetWidth offsetHeight , scrollWidth scrollHeight

• clientWidth /clientHeight is the visual portion of box content, borders and scrollbars not included, but padding is included • offsetWidth/offsetHeight is the size of visual box including borders. Can be calculated by adding width/height and padding and borders. • scrollWidth/scrollHeight is the size of the box content, including the parts that are hidden outside the scrolling area