Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. JavaScript Bundle getting build every time it finish building. Asked 4 years ago. Active 2 years, 1 month ago. Viewed 4k times. Uddhav P.
Gautam 6, 3 3 gold badges 40 40 silver badges 57 57 bronze badges. Emmanuel Emmanuel 2, 2 2 gold badges 12 12 silver badges 15 15 bronze badges. Did you find the solution? A critical consideration with updates is compatibility between the JavaScript bundle and the native runtime i. To illustrate, consider the following example:. Say you have an existing build, build A, of your app running in production. Build A runs JavaScript bundle version 1 and everything works smoothly.
In the next version of your app, you need some new functionality, so in development you install a new native module like expo-media-library , and use some of its functions. You create build B of your app which includes the MediaLibrary native module.
However, if build A of your app fetches JavaScript version 2 as an update and tries to run it, it will error on the MediaLibrary. If your JavaScript doesn't catch this error, it will propagate and your app will crash, rendering JavaScript version 2 unusable on build A of your app.
We need some way, therefore, of preventing JavaScript version 2 from being deployed to build A -- or, in general, controlling which updates str deployed to specific builds of your app.
Runtime Version. Updates hosted on your own server can make use of a concept called Runtime Version. Runtime Version represents a versioning scheme for the native-JavaScript interface, or the native modules and the methods they export.
In other words, anytime you make a change to your native module layer, such as adding, removing, or updating a native module, you would increment the Runtime Version number. The Runtime Version of a particular binary should be configured at build time see Configuration Options below. The configured Runtime Version will be included in the header of every update request sent from that binary. The server should use this header to select an appropriate update to serve in response.
The Runtime Version expected by a given update must also be provided as a field runtimeVersion in the manifest returned to expo-updates. Because the current implementation of the Expo updates service relies heavily on SDK version a managed-workflow concept , if you're using expo publish you cannot yet use Runtime Version to manage compatibility of your updates and binaries. Instead, you can use release channels. After creating a build with this release channel name configured, you can continue to publish future updates to this same release channel as long as they remain compatible with that build.
Only builds that were configured to use that release channel will receive those updates. Statically Hosted Updates. Since headers sent in requests by expo-updates do not affect statically hosted updates such as update packages created by expo export , you must host incompatible updates at different static URLs in order to control compatibility.
Embedding Assets. In addition to loading updates from remote servers, apps with expo-updates installed also include the necessary capability to load updates embedded in the app binary. This is critical to ensure that your app can launch offline for all users immediately upon installation, without needing an internet connection. When you make a release build of your app, the build process will bundle your JavaScript source code into a minifed bundle and embed this in the binary, along with any other assets your app imports with require or import or used in app.
Including Assets in Updates. Assets that you import in your JavaScript source can also be atomically downloaded as part of a published update. If you use expo-asset in your project included by default if you have the expo package installed , you can control which imported assets will be included as part of this atomic update by using the assetBundlePatterns key in app. Assets with paths matching the given patterns will be pre-downloaded by clients before the update that uses them will launch.
If you have an asset that should be lazily downloaded at runtime rather than before your JavaScript is evaluated, you can use assetBundlePatterns to exclude it while still importing it in your JavaScript source. If you use expo export or expo publish to create your update, this will be done automatically for you. Configuration Options. Some build-time configuration options are available to control various behaviors of the expo-updates library.
On iOS, these properties are set as keys in Expo. On Android, you may also define these properties at runtime by passing a Map as the second parameter of UpdatesController.
Even after creating fresh with react-native-init. Uncaught in promise TypeError: Failed to fetch I believe this could potentially be caused by updating sdkVersion from Reply to this email directly, view it on GitHub, or mute the thread. Maybe we can create a new one?
I'm not sure if my issue is related, however, sharing my experience with such behaviour might help you: I've had problems deploying the app to my android phone. I will agree. Reinstalling Expo android app fixed the issue for me. If you have a loading state just check if you don't have a bad check..
After doing this cycle once or maybe twice the app was loaded. Hope this helps! The Expo sdk version is Simply restarting the emulator will leave you in the same broken saved state. Pines-Cheng mentioned this issue Oct 31, Sign up for free to join this conversation on GitHub.
Already have an account? Sign in to comment. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. So back in , I created Webpacker , and in , we shipped Rails 5. Five years later, the facts on the ground have finally changed.
I no longer believe that this bargain is worth it for most new applications. It's not a dead-end, and there are still certain types of applications where it does make sense hello react! The first crucial change is that ES6 is now supported by all browsers that matter. The last major hold out was IE11, but Microsoft mercifully announced its end of life this year. This means we don't need a transpiling step to turn ES6 into something that'll run in the browser.
It runs just fine, no changes needed. That's huge. The second crucial change is that HTTP2 is now the norm. With HTTP2, you no longer pay a large penalty for sending many small files instead of one big file. A single connection can multiplex all the responses you need. No more managing multiple connections, paying for multiple SSL handshakes. This means that bundling all your JavaScript into a single file loses many of its performance benefits yes, yes, tree-shaking is still one.
In fact, the single-big-bundle pattern is now worse in several ways, not just developer ergonomics like long bundling times! When you bundle all your JavaScript modules in a single file, any change to any module will expire the entire bundle. Forcing the browser to download the whole thing anew, parsing everything again. That's bad. When you keep each module separate, they can expire independently.
So if you have 20 modules, and only one change, the other 19 remain cached. This is the kind of caching dynamics that performance enthusiasts crave.
But more importantly for our overall argument is that if you no longer need bundling for performance, you can get rid of the bundler entirely!
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