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Niall Maher
Niall Maher

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NextJS V10 | 📝 Highlighting the good, great and awesome updates

Over 20 updates were packed into the new NextJS version 10 update, and in this article, I will go over what are, in my opinion, the big ones. If you are looking for the official word, head over to NextJS's official blog post.

We introduced over 20 new features that improve performance and developer experience. At the same time, the JavaScript size of the Next.js core has been reduced by 16%. - blog

I chat about all of these features a little more in this video:

My Next.js video version of this article 📹

React 17

We can now safely update to React 17 with the newest update. When you upgrade to NextJS 10 or start a new project, you will get the fantastic new JSX transform by default. 

If you don't know what that is you should check out Jesse's (codeSTACKr) video giving a detailed breakdown:

New Image Component

I think most people will think this is the MVP of this release.

This is the number one reason I would have picked Gatsby over Next.js because of the awesome gatsby-image component, which made it still optimal for generating static sites with lots of images. 

The NextJS team worked with the Google Chrome team to offer super image optimisations by default. It's basically a drop-in replacement for a normal img tag.


// Before

export default function() {

  return <img src="/avatar.jpg" width="400" height="400" alt="Avatar">

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// After

import Image from 'next/image'

export default function() {

  return <Image src="/avatar.jpg" width="400" height="400" alt="Avatar">

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I won't go into too much detail here, but basically, we get lazy loading by default when we use this new Imgtag and then we can mark images that are in the initial viewport to preload them. 

I am excited to replace all my images with this tag now.

Fast Refresh for MDX

A small detail that didn't frustrate me too much but a nice improvement. @next/mdx will now leverage Fast Refresh, making sure the browser does not have to reload the page while you are editing and developing. 

The @next/mdx documentation guides you through how to set up MDX with Next.js.

CSS from node_modules

More optimisations! Instead of having to load all your libraries CSS straight into _app.js, now we can import them in the required components. This might seem like a small thing but now we can lazy load CSS as required which depending on the library you are using (and where you are using it), this could be some big improvements to your initial load speed.

Easy Internationalization

With domain routing, subpath routing and language detection, setting up internationalization has never been easier. 

If you have the locales set up, you will automatically be routed based on your Accept-Language header (which is easily disabled in case you didn't want this). 

You can then grab the locals from next/router and you will now see your locales in the router object:

Sample router object

Example of router object when we navigate to our Spanish domain

Automatic Resolving of href

One thing that I always felt was frustrating when I was using Link tags was remembering what to put in as versus href.

Now you can stop using as and it will automatically resolve under the hood for you:

// before v10

<Link href="/blog/[slug]" as="/blog/posts">
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// after v10

<Link href="/blog/[slug]">
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Next.js Analytics

NextJS Analytics isn't your usual benchmark tester. With NextJS Analytics, it analyses your actual user's performance so that you can really see how your users perceive your site rather than the one size fits all approach. 

Screenshot of the analytics

NextJS Analytics 

Next.js Analytics is about focusing on the entire picture, deeply understanding your audience, and how your application performs for your users.

I'm rebuilding my business site with NextJS, so I am excited to give this a test run the moment I push it to production. 

NextJS Commerce

Ever needed to build an eCommerce solution and not know where to start? 

Sampel of e-commerce site

Screenshot of NextJS Commerce site

As someone who has launched a handful of shops on Shopify because it was the easiest solution, I am super happy to see this. NextJS Commerce offers a boilerplate optimised eCommerce store. Get super speeds to boost your SEO and customer experience. Currently, it has an out of the box integration with BigCommerce, but they said they are working on solutions for other vendors like Shopify too (which is when I will probably dive headfirst in then and move one of my stores over).

Check it out here:

I'm currently rebuilding my business site with NextJS since this update dropped and I am excited to see how my website performs when it's all done. 

What's your favourite feature that dropped?

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Top comments (4)

ematipico profile image
Emanuele Stoppa

Hey Niall! Great post! Just one thing that could mislead people in your video. React 17 actually HAS breaking changes! It's a major release and they follow semantic versioning.

One of their breaking changes is how they delegate their synthetic events. This, in most of the app, won't break but it could happen! 😉

nialljoemaher profile image
Niall Maher

Dang, I didn't actually think of that. I know it changed how they delegate events but didn't think it broke anything. Thanks for the update! 🔥

nialljoemaher profile image
Niall Maher

Also pinned a comment to the video with a note and a thank you 🤘

ematipico profile image
Emanuele Stoppa

No problem! 💪