When it comes to Google Core Web Vitals, this is not good enough. What tools should you use?

The screencast is nearly unedited to show the whole process and not only the polished outcome.

So, you may already be much closer to achieving the benchmark of 100 milliseconds or less than you think. According to the docs we first need to initialize or project. However, many businesses cannot choose to get rid of these videos since they are a part of a product demo or introduction video. Consider areas such as speed, responsiveness, visual cues, image sizes etc. You should see an error about the module: The addition to fix this will go into jest.config.js, a property called moduleNameMapper which uses RegEx syntax, so is a bit more complicated: ^ The regex is using a capturing group to take everything that comes after @/components and resolve it instead from the /components specified on the right.

2021 ooloo software UG - All rights reserved. why are we considering an abandoned config :(, Not abandoned: https://www.npmjs.com/package/eslint-config-next/v/10.2.1-canary.3, The package is here on GitHub: https://github.com/vercel/next.js/tree/canary/packages/eslint-config-next, ah, author mentioned the old url for github on npm (https://github.com/mvila/eslint-config-next). In the rest of this article, youll learn more about how the Core Web Vitals will affect rankings, what site owners can do to improve their performance metrics, and get some of the tools and know-how you can use to get started and get ahead. To start, in your terminal of choice, cd into a folder where you want to install this project.


This will also include a plugin for specifically linting React, and another for linting import/export statements. We're a place where coders share, stay up-to-date and grow their careers. This way you don't get conflicts between Prettier and ESLint. Often, this situation leads to click rage, which are moments when a user repeatedly clicks on a web page due to frustration arising from a delayed response from the site. Im going to assume you have familiarity running commands in a terminal, and Im going to use npm commands. With you every step of your journey. As technology improves, the current scores may change based on what users expect a good web experience to be. Based upon aninfographic from Kissmetrics, any page that takes longer than 3 seconds to load will lose the interest of over 25% of your traffic.

If you are using WordPress, there are plugins available (such asWebP Express) that will convert your images into this format. Therefore, we predict that most websites will see either positive or negative shifts across the majority of keywords over a period of a few months. If you need more convincing, remember when Facebook changed its motto to move fast with stable infra? So, we completely understand that these terms are confusing.

Linting means no need to worry that a missing ) or } will leave you bashing your head against the wall for 30 minutes wondering why your code doesnt work. Update the .eslintrc file by adding the following at the bottom, after the ignorePatterns property: ^ Ive added an additional entry for a hypothetical /classes directory to show the syntax for multiple aliases. If you have been investing in SEO for some time, chances are that when you run your report your SEO score will be close to 100. Else, it may be time tochange your SEO provider. Next.js doesnt support it out of the box, but this official example repo shows us how to set it up. However, this is still important as it makes the files smaller and enables faster network transfer. The majority of top traffic-driving websites load within 4 seconds or less.

I'll be updating this to be more specific. I am so thankful for your tip, especially about the version.

Static check with next 11 (Prettier, ESLint). However, although these recommendations carry huge merit, the focus of these tools is purely based on your overall website speed.

styled-components is a very popular library for writing custom CSS. Next.js is the go-to React framework. You dont even have to use all of it right away.

Learn on the go with our new app. When { experimental: { eslint: true } } is now enabled in next.config.js: This config extends recommended rule sets from eslint-plugin-react, eslint-plugin-react-hooks, and eslint-plugin-next. For example, unused variables don't cause an error. In addition to this, once you do manage to fix the issues, you will see an increase in user engagement and also your visibility on Google. :).

For every image, the browser has to download the complete file before being able to serve the image to your visitors.

Any good developer should already be across the work required to improve your core web vitals. Else, how are we going to find out what to fix!? Your project should look like this: For this configuration, lets start with eslint thatll ensure that any future code we write is linted right away and we dont need to go back and make edits.

How to set up a React project (the professional way), A standard set of rules found in the ESLint docs. Lets fix that! The next step is to generate a report for your own website to measure performance. I use VS Code and its Prettier extension with the following settings to auto-format when I save a file. If you're looking for a quick guide you can find all steps for the setup on this page.

Deep Dive Into Design Patterns With JavaScript.

now try npm run test, error should be gone! afaik underlying plugins from config-next are not shown in project package.json or eslint file so it's unclear for a user to know which plugins does it extend. During the loading process, only the dimensions of the off-screen images load to avoid page break. This discussion covers steps taken to include a Next.js' specific plugin and shareable config and proposes a default setup for all new applications built with Create Next App.

But it will let us lint the Next.js project we have now with the --fix flag enabled to automatically format our code (next step!). Embedding images and videos on a website can slow down a site. Create a file in the project root named jsconfig.json. If you really need next/core-web-vitals, you should only use next/core-web-vitals at extends instead. Start with the install: ^ jest for running the tests & @types/jest to help with IDE auto-complete when writing tests. Each component of your website should be optimised to align with what Google wants to see from the resources of your website. You upload via JPG or PNG and the plugin will convert and serve your images in this format to your users. Our tests have come out with mind-blowing results for websites that have enabled it.

Additionally, we need to create the pages/_document.tsx file to avoid a "flash of unstyled content" on the initial page load according to the example repo. The Next.js app is already set up with ESLint which is used to detect bugs by statically analyzing your code.

For example, you are on a website and click on a link to go to another page. You need to gain hands-on experience. Over the last few years, you may have observed that website page speed has taken centre stage within the SEO community. That makes your code more readable and saves you a lot of manual effort.

Since Google is taking this update seriously, you will not have to use an external tool like GT Metrix. For us, that means adding configuration for Next.js, Jest, ESLint, and VSCode so a lot of updates to the configuration weve done thus far but dont worry its not too drastic. Instead of using a tool to generate fake traffic to deliver these reports, the Core Web Vitals are using your real visitors behaviour to monitor performance. If you npm run lint now, you can also see all the errors in the console. When a website loads slowly, you can almost guarantee that the majority of this bloat comes from large image files. LCP (or largest contentful paint) is measured by the amount of time a user has to wait before your website pages primary content is loaded. Lets take a look at the 3 core elements of what core web vital metrics mean and how you can measure performance. Implementing a lazy loading technique also increases the score of WebVitals as only the onscreen image resources come along with the initial payload. This is a very small subset. You signed in with another tab or window. I personally hate having to remember which particular file Im working in and how many levels it is to import some other component or methodso I love aliasing my import paths. The pages/api/hello.js should be error-free! As more rules get added to the plugin, only those that are guaranteed to negatively affect Core Web Vital metrics will be included into this entry point. Over 50% of Next.js apps use ESLint in some part of their build workflow.

Create a file src/pages/index.test.js and add some test code: The last change for Jest is to the package.json file; Update it to add a test script under the lint script you added earlier: Then in the project root in the terminal you can npm run test and should see it passing! Add this to the file you just created: ^ This wont trigger a HRM refresh, so youll have to stop the dev server and npm run dev again, but after that your component should be up and running again! coverageDirectory is for generating test coverage, running jest with the --coverage flag. Add this to the jest.setup.js file: ^ This enables access to the additional assertions provided by the @testing-library/jest-dom package. The need for each entry to be its own array was not intuitive for me.

Jest & React Testing Library, on the other hand, require some effort after setup. As some examples of techniques you can use to achieve the perfect core web vital score, take a look at our recommended suggestions below. When you start a new React app you might wonder how to set it up in a professional way. I think in next@^11 the "next/core-web-vitals" already extends the "next" config, so you don't need to put it in the array. To further diagnose and troubleshoot issues, youll want to use Google PageSpeed Insights, which is linked to every report in Search Console.

Font rendering behaviour is one of the most important speed drainers Browsers are trained not to render the text unless the font loads from the payload. To improve your FID score, website owners should look at improvements such as: An ideal measurement for FID is less than 100 ms. The new update focuses on much more than just how fast your website loads. Minification is a process where the non-critical and redundant resources are removed to speed up the process. To be frank, there is a ton of it. A good CDN can swap the font of the rendered text and display the original font as soon as it loads from the CSS. However, just like any signals that Google uses to decide which websites should appear above others within SERPs, there are hundreds of them. This is a basic feature offered by most optimisation plugins. Im going to jump right in to adding configuration, and wont dive in to too much detail on any one item Next.js, React, Jest, React Testing Library, or ESLint but I will try to give at least some high-level context for whats happening at each step. Google also considers FID as extremely important because this takes into account the fast nature in which we interact and engage with websites. As for the other metrics, the likelihood of achieving an ideal score is quite low. So ensuring your server is responsive and fast still remains essential.

A standard set of rules found in the ESLint docs is eslint:recommended. It should be noted that the Core Web Vitals speed scores are not a permanent set of metrics that define page experience. Testing your code is a good habit to have, and there are some very good resources out there to help you figure out what to test. 133 Buckhurst St, South Melbourne, VIC, 3205 @SalahAdDin No, plugin:@next/next/recommended will not include next/core-web-vitals. You can just extend next and next/core-web-vitals if you want, leaving out the others. I have seen some debate that leads me to believe path aliases are a love-it or hate-it addition to a codebase. The good news, although these can be a nightmare to fix, is that there are many recommended solutions now available from Google. Core web vitals are a new set of performance metrics centred around the essential components of your website that drive a superior user experience. So, if you did not pay attention over the last few years to user experience, best jump to it!

Resources such as large image files, additional javascript, redundant CSS files and the number of requests each page needs to make to load the content will slow down your website and negatively impact the user experience. DEV Community 2016 - 2022. https://github.com/BenjaminWFox/nextjs-base. This will be two new folders and a file: src/components/callout/callout.js. Now change src/pages/index.js to use the aliased absolute import: and you should see an error, yay! Finally, run npm run cypress to initialize the project.

Run npx prettier --write to format all files.

These cannot be type checked so a linting rule would be nice, That sounds like a great place to have a rule in place for (to display as a warning at least but potentially even as an error?). Im not going to talk about IDE-specific integrations or setup. Youll already have eslint and eslint-config-next so lets add two more: While thats running, open up the .eslintrc.json file that is at the root of your site and replace the contents with the configuration below. This creates a few folders and demo tests in your repository. Then run Storybook. 30 Day Typescript Type ChallengeChallenge 29. The configuration for ESLint will be added to .eslintrc, but first we need to install another package: ^ this package adds the functionality for ESLint to handle the resolution of aliased paths, which it cant do by default. While most of this was shrouded with myths and theories about howimproving your website speedpositively impacts your rankings, Google has literally busted this wide open with the announcement of Core Web Vitals. But its important Consider this step the first reminder to go slow to go fast (esp. @neefrehman agreed - though one thing to watch out for with eslint-plugin-jsx-a11y is that it will throw errors with the default usage of next/link component. For Digital Next, core web vitals have always been important even before they were announced. Many developers tend to use it for any new React project. The first step to optimise the JavaScript and CSS is to minify these resources. Also no more need for an explicit .babelrc file! What libraries do you need from the start?

The following is an initial set of rules that eslint-plugin-next will check for: New, experimental ESLint changes have been introduced to Next.js (still experimental/in canary).

Ive made a couple updates here including the use of the src directory, and a few minor changes to the ESLint ruleset and the Jest/React Testing Library based on my updated preferences and new best practices. In fact, you can easily find your websites core web vitals via Google Search Console.

Add this content to the jest.config.js file: ^ There are a huge number of configuration options for Jest. For the setup, the Next.js docs are again very helpful. . When we implemented this optimisation, it showed a 70% improvement in performance in Lighthouse. This bootcamp can get you from amateur to pro with a single project. Check it out on regex101.com for a more complete breakdown of whats going on. The state of next.js image optimization seems to be in a pretty contentious #19914 spot right now and there are many other reasons for why you might not want image optimization, especially if you serve images through an S3 bucket and/or already get image optimization through something like https://imgproxy.net.

My only concern is that I wonder if this changes too frequently as new APIs get included and others become deprecated. Take a look at some of our suggestions for optimising images below: If your images load from the same server, it might put a lot of load pressure on your server.

Other IDEs should have similar options, but likely require other specific setup steps.

While LCP measures how long a page takes to load your content, FID measures the time it takes for a page to become interactive. Built on Forem the open source software that powers DEV and other inclusive communities. . We have a feeling big news websites might struggle with this one as a primary factor of unoptimised CLS is advertisements. Thats 10MB that needs to be downloaded on top of everything else you want to display. Update: 06/28/21: Next.js v11 has some improvements when it comes to adding and using ESLint in a project, including some Next-specific linting rules. I simply went with npm. Give feedback. Simply log in to your Google Search Console account and you will find a report called Core Web Vitals. Now add one new script to your package.json file under the start script: ^ Dont forget the , (comma) at the end of the lint line!

Its superb documentation & zero-config philosophy make this possible, and not having to think about configuration is wonderfulright up to the point when you want to add some additional configuration.

Bloated code and unnecessary scripts result with your server having to work overtime just to load the very basic elements of your website. Software developer currently working in healthcare. Should you build a project? While the user will not see Javascript or CSS code when viewing your website, that does not mean these file types will not cause havoc on your websites page speed. Core Web Vitals: The What, Why & How Of Googles Big Update, Removing any unnecessary third-party scripts, Removing any non-critical third-party scripts, Using set size attribute dimensions for any images or videos. what about a rule to check the functions exported from within a page? You may not start testing much right away particularly if your UI & functional requirements are subject to frequent, drastic changes but you should test what you can. now do npm run lint.fix and youll see a number of formatting changes to align the code with the linter rules, and no more errors! This repository has been archived by the owner. You would need to override a couple rules, as suggested in this issue: This is what I'm doing in my own custom ESLint config currently, and it's working well so far, Ah yes good point! Are you sure you want to hide this comment? Was this translation helpful? AMP cache can help optimise delivery, but enabling AMP for desktop may cause significant UI changes and impact conversion.

My apologies for the delay in responding. (Feel free to remove the --typescript option if you already have too much to learn.). The Next.js app doesnt use the Prettier format by default. Typically you would alias the top-level folders to reference the import path from there, but the only two top-level folders we have currently arent really something we need to alias; Anything in pages/ probably shouldnt be imported anywhere else, and anything in public/ can already be referenced by absolute path in src or href attributes. When you open the test files you'll realize that ESLint complains that global functions like describe or it don't exist. Finally we need to update Jest. If your website takes up a lot of time to load, your visitors will automatically choose to opt-out from your webpage and visit your competitors site instead. Now that we have a component to test and we can see its not working, lets start the configuration updates. In short, the impetus of the Google Core Web Vital update is very much on improving metrics that matter the most to users, rather than your browser or manipulation towardsGoogle algorithm updates. The error would need to occur in a very specific set of scenarios where it would clearly be beneficial otherwise it's just noise. To improve the usability of your website, you may have previously used tools such asPagespeed InsightsorPingdomto find ways to optimise your websites page speed. Now that your page load time and interactivity time is sorted, the next item on your agenda should be cumulative layout shift. Prettier is used to automatically format your code according to a standard.

If you do, you can also omit the everything in the rules property. In fact, most SEO agencies do not have the in-house expertise to achieve some of the more technical optimisations when it comes to manipulating website files. (ABN: 33 166 515 680). This configuration is, technically, useless to your final product. Thats because the FID of the website is very slow. AWS and Cloudflare are currently the best picks if youre looking for a good Image CDN provider. To get rid of these errors we can install an ESLint plugin and adjust the eslintsrc.json config file. As with all ranking signals, we will know in time how strong of a ranking signal core web vitals will become. This causes a lot of delay in rendering the pages and results in slower page speed. You can see this in node_modules/@next/eslint-plugin-next/lib/index.js when you're searching for 'core-web-vitals' in your next project: By the way, at the moment you need to pin eslint to "7.32.0", because the version 8 has breaking changes and throws an error. Personally, I like the extra structure and whats there feel to me like a good default baseline. Also make sure the video resources load only when a user clicks on the Play media/video button.

This is it!

Sounds great right? Some of the configuration files we create (jest.config.js & .eslintrc) can be included within package.json rather than using separate files, if that feels cleaner to you. In normal cases, this happens within a few microseconds as both resources are delivered from the same CDN server simultaneously.
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