webpack dynamic import not working webpack dynamic import not working

And this is what is causing all the trouble. Adding this comment will cause our separate chunk to be named [my-chunk-name].js instead of [id].js. Dynamic import seems to be the solution but Im not having any luck getting webpack to create the chunk files. Webpack: Common chunks for code shared between Webworker and Web code? https://github.com/roblan/webpack-external-promise-import, __webpack_require__ should not be called on promise external result. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Do new devs get fired if they can't solve a certain bug? Connect and share knowledge within a single location that is structured and easy to search. ? The following parameters are supported in the order specified above: Although the implementation of require is passed as an argument to the callback function, using an arbitrary name e.g. This can be used for optimizing the position of a module in the output chunks. @sokra @evilebottnawi Any updates on this issue? Once the npm run build is run, the dist directory should have 2 files: main.js, which is the main chunk, and animal.js, which is the chunk in which all the modules corresponding to the files inside the animals/ directory reside. *.js(loosely).In the upcoming sections we will explore what happens once these files have been figured. Ive written a fairly large app and I need to reduce the load time. webpack --env.production true, Hash: 40911497abda454cf910 Are the Webpack Magic Comments You also need to know that fully dynamic statements such as import (pathToFile) will not work because webpack requires at least some file location information. What is the !! index.js This issue had no activity for at least half a year. + 1 hidden module, As far as I can see, you have the correct config and code. Dynamically load modules. It's important to mention that the traversal and the file discovery are done at compile time. The value here can be anything except a function. How do I return the response from an asynchronous call? For example, with core-js@3: webpack.config.js const config = { entry: [ Using it asynchronously may not have the expected effect. [4] ./sources/views/admin/win_create_subscription.js 5.75 KiB {0} [built] Lets refactor our function: - Still not good! He suggested me to use the public folder as described in the create-react-app readme and to not import the SVGs via webpack: // similarly to other require/import methods. Precisely, webpack stores the loaded chunks in a map such that if the chunk that is requested has already been loaded, it will be immediately retrieved from the map. Include a dependency without executing it. You do not need to add curly brackets. I've tried with a couple of magic comments from webpack like the example below, but nothing worked so far: const LazyComponent = lazy(() => import(/* webpackIgnore: true */ packageOne)), Hi @Miaoxingren, curious how were you able to fix this issue? to your account, __webpack_require__ is called with result of promise external when it's is loaded as dynamic import, which results with error If you want to follow along, you can find a StackBlitz demo here(it's safe to run npm run build first). Hopefully, at this point, things make more sense when it comes to using import with dynamic arguments. Technically, you could stop here and officially have done code splitting! Although it is a popular selling point of webpack, the import function has many hidden details and features that many developers may not be aware of. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. This feature relies on Promise internally. By default webpack import all files from views folder, which can conflict with code splitting. Please pay attention to these enforcements before you read on: Version 2 of webpack supports ES6 module syntax natively, meaning you can use import and export without a tool like babel to handle this for you. webpack version: 4.25.1 I solved it. The way we're currently doing things, the cat module is not loaded from anywhere else, so this is why we're facing an error. dynamic import for chunk in node_modules is not working as expected #10722 alexander-akait mentioned this issue Ability to force bundling of a module #11223 alexander-akait closed this as completed on Jul 24, 2020 Sign up for free to join this conversation on GitHub . There might be a case where the module exists, but it is not available. The text was updated successfully, but these errors were encountered: That part wraps the result in a namespace object as import() always returns a namespace object. You may want to look into output.publicPath to setup to correct URL. Hey, I noticed that Webpack just put numbers to generated chunks. I will first type cat and then press the button. - A preloaded chunk starts loading in parallel to the parent chunk. Already on GitHub? You signed in with another tab or window. This is the default mode, meaning that you don't have to explicitly specify it. fish.js to your account, What is the current behavior? to get it working. Ok, I do this for a lot of images, this turned into a big problem and because of this extra requests, the images are slower to load. (In my case google maps api). The syntax is pretty simple. Well occasionally send you account related emails. If you want the Chunks to be named properly; I would suggest going through the following checklist: Let me know through comments ? There is also an article named An in-depth perspective on webpack's bundling process in which concepts such as Modules and Chunks are explained, but it shouldn't affect the understanding of this article too much. Now it works. Available since webpack 5.0.0-beta.18. From the import('./animals/cat.js') statement, we can tell that the module exists in the app, but in order for it to be available, the #load-cat button must be clicked first. Have a question about this project? Find centralized, trusted content and collaborate around the technologies you use most. Therefore, I think it's definitely a bug. Note that setting webpackIgnore to true opts out of code splitting. 7 comments LASkuma commented on Nov 5, 2018 edited webpack-bot added the inactive label on May 31, 2019 alexander-akait closed this as completed on May 31, 2019 colscott mentioned this issue on Jun 16, 2019 it's as if the current module would directly require the modules which are inside the animals directory, with the exception that none of the modules will be actually executed. [6] ./sources/views/admin/win_create_subsuser.js 3.24 KiB {0} [built] See this thread to the problem https://github.com/webpack/webpack/issues/5747. If youre using HTTPS is even worse! - A preloaded chunk has medium priority and instantly downloaded. Theoretically Correct vs Practical Notation, How do you get out of a corner when plotting yourself into a corner, How to handle a hobby that makes income in US, Replacing broken pins/legs on a DIP IC package, Surly Straggler vs. other types of steel frames. // In this example, the page shows an `input` tag and a button. Use require instead, e.g. Here are some tips to improve reading habits gradually and not hate it. webpack.config.js. Because foo could potentially be any path to any file in your system or project. By clicking Sign up for GitHub, you agree to our terms of service and Consider the following example: The StackBlitz app for this example can be found here. By adding comments to the import, we can do things such as name our chunk or select different modes. A prefetched chunk is downloaded in browser idle time. How to use Slater Type Orbitals as a basis functions in matrix method correctly? provide a real example: Webpack Dynamic Import Expression Not Working, Adding asssets outside of the module system, https://github.com/webpack/webpack/issues/5747, How Intuit democratizes AI development across teams through reusability. Similar to require.ensure, this will split the given dependencies into a separate bundle that will be loaded asynchronously. How do I check if an element is hidden in jQuery? More specifically, considering the same file structure. [8] ./sources/views/timeclock/win_userdepts.js 3.39 KiB {0} [built] @sokra Could you be more specific? Now here's the part that errors on build. Secure websites are necessary requirements. Sign in Note: This feature was added on Webpack v4.6. // And here the chunk is loaded. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Any help would be greatly appreciated. It is crucial to have a (root) parent chunk because it contains the required logic to fetch and integrate other child chunks in the application. jharris@hpenvy:~/fossil/anytime_webix$ npm run build, [email protected] build /home/jharris/fossil/anytime_webix Unlike SystemJS, webpack can't load any arbitrary module at runtime, so the fact that the value will be known at runtime will constrain webpack to make sure that all the possible values that the argument can resolve to are accounted for. So, is better to preload that small image chunks than add it to the bigger bundle/chunk right? animals Environments which do not have builtin support for Promise, like Internet Explorer, will require both the promise and iterator polyfills be added manually. Based on the module's exports type, webpack knows how to load the module after the chunk has been loaded. [40] ./sources/views sync ^\.\/.$ 1.62 KiB {0} [optional] [built] If you use require.ensure with older browsers, remember to shim Promise using a polyfill such as es6-promise or promise-polyfill. Normally we recommend importing stylesheets, images, and fonts from JavaScript. It's really hard to keep up with all the front-end development news out there. Since webpack 2.6.0, the placeholders [index] and [request] are supported within the given string to an incremented number or the actual resolved filename respectively. I am having same problem even with webpack 5, // Uncaught (in promise) Error: Cannot find module 'x' at lib lazy ^. Which you can see here: GitHub - airbnb/babel-plugin-dynamic-import-webpack: Babel plugin to transpile import() to require.ensure, for Webpack. Refresh the page, check Medium 's site status, or find something interesting to read. The same file structure is assumed: Internet Explorer 11), remember to shim Promise using a polyfill such as es6-promise or promise-polyfill. Now in this example, were taking a more functional approach. Redoing the align environment with a specific formatting, How to handle a hobby that makes income in US, Minimising the environmental effects of my dyson brain. The diagrams have been made with Excalidraw. Can you write oxidation states with negative Roman numerals? webpackPreload: Tells the browser that the resource might be needed during the current navigation. Already on GitHub? So, your initial bundle size will be smaller. Dynamic import from node_modules is not working, https://github.com/Miaoxingren/webpack-issue-8934, dynamic import for chunk in node_modules is not working as expected, https://github.com/younabobo/webpack-dynamic-import-test, https://webpack.js.org/api/module-methods/#dynamic-expressions-in-import. You put it in like so: "syntax-dynamic-import". To get it start faster we can use webpack's cache-loader . Other relevant information: Real-world apps dont have only one page at all! Module ID's type can be a number or a string depending on the optimization.moduleIds configuration. An in-depth perspective on webpack's bundling process, Change detection and component trees in Angular applications, Improve page performance and LCP with NgOptimizedImage, Deep dive into the OnPush change detection strategy in Angular, Deep dive into the infamous ExpressionChangedAfterItHasBeenCheckedError inAngular, From zone.js to zoneless Angular and back how it all works. Additional tools: The text was updated successfully, but these errors were encountered: Please create minimum reproducible test repo. As the import is a function receiving a string, we can do powerful things like loading modules using expressions. According to the document: I should upload dist files of my-custom-comp to cdn or copy dist files of my-custom-comp to app's assets folder? There is no option to provide a chunk name. We can notice from this diagram the 4 chunks that have been created(one for each file in the animals directory), along with the main parent chunk(called index). Operating System: OSX 10.13.6 (17G65) It's totally understandable that webpack is a bundler and it should not take care of loading script from another domain. Split out the given dependencies to a separate bundle that will be loaded asynchronously. [9] ./sources/views/admin/dashboard.js 1.58 KiB {0} [built] The function name or variable name is the identifier under which the value is exported. webpackIgnore: Disables dynamic import parsing when set to true. Ive tried several different variations of the imports. It's because I am using the presets in Babel; comments are on by default. // Here the user chooses the name of the file. A few examples of dynamic expressions could be: import('./animals/' + 'cat' + '.js'), import('./animals/' + animalName + '.js'), where animalName could be known at runtime or compile time. - Coco Jun 21, 2018 at 20:36 Already have this plugin installed, and it still does not work. How Webpack Handles Dynamic Imports with Variable Paths | JavaScript in Plain English Write Sign up Sign In 500 Apologies, but something went wrong on our end. Webpack adds a really nice feature to the dynamic imports, the magic comments. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. just load them when used. In the previous section we've seen how to manually specify the mode, so the way to tell webpack we want to use the lazy-once mode should come as no surprise: The behavior in this case is somehow similar to what we've encountered in the previous section, except that all the modules which match the import's expression will be added to a child chunk and not into the main chunk. How to resolve dynamic import from node_modules? Lets check it on the code below: But hey, this is a pretty simplist approach. Synchronously retrieve a module's ID. Environments which do not have builtin support for Promise, like Internet Explorer, will require both the promise and iterator polyfills be added manually. The result of the dynamic import is an object with all the exports of the module. + 28 hidden modules In the Lib project: Create an entry point file, say index.js, that exports all the custom React components like this: import {Button} from './button'; import {DatePicker} from .