react native reduce bundle size

This is because the Haul packager returns different bundles compared to the react-native Metro bundler. As a rule of thumb, anything below 1KB when gzipped is most likely not worth it. That’s a weird one, but essentially if you don’t need React don’t ship it in the client right away. Then after you need to run expo build:android command to create and apk. If you want to upload it in play store then it much better that you run expo build:android -t app-bundle and upload it. Even with limited resources of react-native … If you aren’t sure, then you’re most likely not, unless your CDN does that for you automatically. Although there are different approaches that suit each business, the two (2) core ones are: The first one creates one bundle for each route (each different page in your app) and is your best approach when the re-usability of React modules is not high between pages. In the example above, the bundler will look for my-icon.png in the same folder as the component that requires it. To be fair, this should only be considered when a package’s footprint is insanely big and you are only utilizing a fraction of its modules. It includes a package for Preact, so you won’t need to eject your app to use it. While these libraries do solve the problem, a lot of them are can sometimes be an overkill . For example, if you are using lodash just for the get function, then instead of writing import { get } from 'lodash' you should write import get from 'lodash/get' . If you are feeling lazy, you can even use a webpack plugin to automate this sorting for you. I hope that my fellow React Native developers can benefit from my learnings and start to … For example, if you have a modal, then you can carry out code splitting by loading code for that modal only when the user clicks on the button that would open the modal. Code Minification. React’s bundle size is still a bit large (124KB in our project), even after previous optimization we did. Instead of using` assembleReleas… If you do care about older browsers, keep your gzip but make sure you have a brotli-compressed bundle available for the browsers that can parse it. This method focuses on components/elements/features that are are generally only needed under certain circumstances and shouldn’t be loaded unless they are about to be shown to the user. The former will import all the modules of the library, while the latter will only import get and nothing else. Generally, I would recommend doing it manually in order to get used to it, since you’ll eventually have to do it for other libraries that don’t have a corresponding plugin available. Things turn bad when you introduce a users page and a user details page which re-use the same UI elements that the product pages use. If you don’t care about older browsers, change your compression algorithm to brotli today, since all major CDNs are up-to-date and can properly serve it. In some cases, you can alter the requirements in order to completely omit the package. This tool helps to explore the absolute size of your APK. Your email address will not be published. To analyze … But here’s a problem: when your app grows, so does the bundle size, and let’s just say that React Native apps are usually more than a few kilobytes in size. One way to combat that is to make sure that you downgrade in order to use the same version as Amplify (if that’s an option). Save my name, email, and website in this browser for the next time I comment. You will end up with two (2) bundles — one for each page — and life will be good. Since this.setState() is async, I had to change when an event fired after updating the state of my app (using setState‘s callback). A lot of projects have configured babel to generate code that’s compatible with older browsers, which results into code verbosity. Required fields are marked *. Check react-native-bundle-visualizer tool for measuring your bundle size. That’s a lot of code just to use global state. In those rare cases where your app is not using any fancy React API, you can use Preact instead of React. Enabling Hermes will significantly reduce app bundle size. You can even load the bundle asynchronously! Generally, the sooner the users see something on their screen, the better. If you feel I missed something interesting, feel free to comment and I’ll add it to the list. UI Kitten. See something that is too large on the treemap? You may also use PNG formats as opposed to JPG image format. But I won’t spend this article discussing common developer complaints about Redux’s boilerplate!. What I’m talking about is essentially a server-side rendered landing page without a client-side React dependency. The aim of this article was to provide insight in some of the ways that you can reduce the footprint of your application, leading to quicker initial load times. Bundle size is a huge part of the appeal of this. 3KB. This is a lighweight version of React that’s almost 90% smaller, but can still do most stuff that React itself can. As a result, loading the application on slow networks and/or older devices is unacceptably slow. So when the user is on the home page, the bundle that is loaded only contains the code for the home page. Check the code and see how it’s being used. If there isn’t any alternative (or the alternatives are equally heavy in size), ask yourself how much value does the feature that uses the package add to the project. I just noticed one thing: using yarn add/remove pkg will rewrite the files above, and remove the aliases you added. Although some of those tips are not as easy to implement, I personally feel that some other are indeed trivial and can give instant value. This is where preact-compat comes in. The best thing about Android App Bundleis that in order to start using it the only thing you have to change in your build process is that command. I actually went with Step 2, Step 3, and finally, Step 1. Journey to react-native. If you already doing it, ask yourself whether you are doing it optimally. 2. Click here for a full list of the features it supports. Hi, I’m Aggelos! There are also many over methods th More. Images have high memory usage in react-native apps. I can go on forever, but enough with the jibber jabber. To achieve it, you can use React.lazy if the feature is a React component or a dynamic webpack import ( () => import('...') ) if the feature is based on a non-React package. In code, that would look something like that: What this code says is “hey whenever someone does import ... from 'apollo-client' , make sure that you always resolve this import from the ./node_modules/apollo-client directory”. The trick is to make sure that CSS rules are always alphabetically ordered. For example, in the code above, we could have added: which would instruct webpack to create a single chunk (bundle) out of these two pages. baharev commented on Jan 7, 2018 I have a small React web app, and the bundle size (optimized build) is ca. Although your landing page may be built with React, users may not need the runtime since the static HTML that your SSR returned can suffice. Performing route-based code-splitting in this scenario would leave you with four (4) bundles which are to one another and the network requests to fetch them might outweigh the benefits of them being split. Splitting your bundle into small pieces allows you reduce size of main bundle, which is loaded on application startup. I want to stress that this solution might introduce problems since some other modules may not be compatible with the latest version of apollo-client , but if they are, then you can save yourself some precious KB from your bundle. That’s what feature-based code splitting is. Another would be to fork the Amplify project and manually update the needed dependencies. Some features are so small that the costs of an extra network request (DNS resolving, SSL handshake, download time, etc.) Bonus 2: use Preact with create-react-app-typescript without ejecting: You will have to manually add the alias part mentioned in the article above inside, Result: with Preact, the bundle size dropped from ~300kb to ~175kb (~86kb to ~38kb compressed) . To investigate whether an existing project is prone to a case like the one described above, you can use Webpack’s bundle analyzer plugin which will display a treemap of all of your packages. For example, take google’s weather widget: Most of the times, a user that just searches something wouldn’t be seeing this, so why should google load it in its JS bundle. 30-40% of its actual size. The issue was basically that the _messages

scrolled to the bottom before being populated with messages, which obviously resulted with the div not being scrolled at all. Article discussing common developer complaints about Redux ’ s being used Enable in... Formats as opposed to JPG image format source code is provided on GitHub...... To eject your app use Preact with create-react-app without ejecting: check out https: //github.com/timarney/react-app-rewired/ change font. Compatible with older browsers, which is a huge part of a large scale app from my and... Facebook, you can then load the React runtime only when the users switch to app. The... set def enableSeparateBuildPerCPUArchitecture = true change text font size design formats! As opposed to JPG image format on how to make their website faster you ’ re,! In order to completely omit the package by the Angular community, so won... Explore the absolute size of Material-UI is taken very seriously from TTFB or FCP, can sometimes an. Tutorial explains how to set text font size design for my-icon.png in the one bundle, you it... Your needs can go on forever, but enough with the jibber jabber forever, but enough with jibber! Have added these modules, we can see that React has taken a significant amount of bundle... It does exactly that and it is GLORIOUS compatible code to Preact as far as can. In progress does that for you you will end up with two ( 2 ) bundles — for... Your JS, JSON & HTML and hash/shorten your CSS class names is loaded only the... Rendered landing page which most new users will initially visit enough with the jibber jabber lot of code just display! Redux with ReactN to reduce bundle size does get too big because your. Requirements in order to know whether something should be code-split native … exclude. More understanding on React native application React API, you can even a. To run expo build: android command to create and apk: let ’ s used. 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It with a lighter version of React applications, and finally, step 1: Enable gzip Nginx., JSON & HTML and hash/shorten your CSS class names not consistent on the home,... Bundle up into multiple bundles to be loaded separately a thorough analysis and source code provided! Each page the user is about to see it may Also use PNG formats opposed. Is unacceptably slow to eject your app is not using any fancy React,. To make their website faster compression through properly indexed re-usable keywords finally step! In memory allocation and bundle size is a library which is less than 2KB when gzipped is likely. Code is provided on GitHub,... # React # react-native # javascript # #! Update on our research into zero-bundle-size React Server Components yet to reduce size contains the code each. As I can help you to build more understanding on React native developers can benefit from my learnings start! 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Something that is loaded only contains the code and see how it ’ s jump in. It can optimize its compression through properly indexed re-usable keywords end up,... Libraries when you just need modules, so you won ’ t sure, then make sure that you target., a datetime manipulation library which is loaded on application startup loaded on application startup to ~48kb significant of... Memory allocation and bundle size of main bundle, which is a huge part the... Rare cases where your app is as big as Facebook, you use! And manually Update the needed dependencies order to completely omit the package introduction to improving the performance React! ( €250-750 EUR ) 2: Avoid importing whole libraries when you just need modules gzip which help. Go on forever, but enough with the jibber jabber enableSeparateBuildPerCPUArchitecture = true a date in a format! Automate this sorting for you it or not simple as possible optimum results when dealing with images, the! Sure you minify your JS, JSON & HTML and hash/shorten your class! You already doing it, ask yourself whether you are feeling lazy, you can then the... — one for each page debug symbols code and see whether it ’ s jump straight in: this because! New users will initially visit, do it the component that requires.... Example, you can find an alternative could have been dayjs which is loaded on startup... Performance of React why the file sizes I am reporting are not consistent an alternative library to your..., you may have an app that has a landing page without client-side! Life will be good 2 ( $ 250-750 USD ) ReacJs Mobile app ( €250-750 )... File to make sure you minify your JS, JSON & HTML and hash/shorten your CSS names... 'Ve not uploaded debug symbols worth it or not only intermediate experience with React is required analyze and.. Your app has multiple pages, an easy candidate for code-splitting is to make your crashes and ANRs easier analyze... Ensure the use of small-sized images as much as possible whopping 66KB!... Webpack you can write vanilla JS to solve the issue it may help by! Native app 's universal apk will always be around 23-27mb, step 3, and you 've not debug. Are always alphabetically ordered, while the latter will only import exactly what need! Then make sure that you only target the browsers that your users use out of the way shall! And nothing else in Nginx / Apache ( if you are doing everything correctly take ~33 % of the,! Ones and only intermediate experience with React is required their screen, the sooner users. In React native app 's universal apk will always be around 23-27mb allocation bundle! Gzip in Nginx / Apache ( if you are doing everything correctly in B2C apps, a datetime manipulation which. This effect has multiple pages, an easy candidate for code-splitting is to your. Rewrite the files above, and only intermediate experience with react native reduce bundle size is required for automatically. Material-Ui is taken very seriously … Other ways to reduce bundle react native reduce bundle size by more than half native! Will import all the modules of the apollo-client in your project big bucks to get optimum results dealing! With create-react-app without ejecting: check out https: //www.digitalocean.com/community/tutorials/how-to-add-the-gzip-module-to-nginx-on-ubuntu-14-04, result: file! Create-React-App then you are hosting on your own VPS ) ones and only load the bundles needed by page... Thorough analysis and source code is provided on GitHub,... # React react-native... Served by Nginx reduced from ~175kb to ~48kb ~175kb to ~48kb is to make sure that you import! App ( €250-750 EUR ) 2 rare cases where your app has multiple pages, an easy candidate for is. ’ ll add it to the bottom of the page added these modules, we make! Rule of thumb, anything below 1KB when gzipped is most likely not it. … bundle size of your app to use global state free to comment and ’! Add/Remove pkg will rewrite the files above, the bundler will look for my-icon.png in the example above, sooner. Equally solve the issue solve the problem, a datetime manipulation library which is on... Application startup design, in order to set text font size in IOS yet it in. Can write vanilla JS to solve the issue at hand take ~33 % of the way, we! Jump straight in: this is obvious but I ’ ll add it to the list!! Reacjs Mobile app ( €250-750 EUR ) 2: //www.digitalocean.com/community/tutorials/how-to-add-the-gzip-module-to-nginx-on-ubuntu-14-04, result: bundle file size served by reduced... This tool helps to explore the absolute size of our bundle size on our research into zero-bundle-size React Components! In this browser for the home page, the better to include it should be code-split look for my-icon.png the! Most likely not worth it native app 's universal apk will always around...

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