We all want faster apps. If the current behavior is a bug, please provide the steps to reproduce. {cacheGroup}.name can be used to move modules into a chunk that is a parent of the source chunk. This plugin is pretty smart and out-of-the-box it will split chunks where the plugin thinks it makes sense. Providing a function to{cacheGroup}.test: In order to see what information is available in module and chunks objects, you can put debugger; statement in the callback. The closest it gets to is 3 and we're talking about the x module here. - here is where SplitChunksPlugin comes into play - it decides on how to properly organise into chunks the modules which are very frequently used in multiple places. Let's try using the first of these two approaches... import() calls use promises internally. This option can also be set globally in splitChunks.filename, but this isn't recommended and will likely lead to an error if splitChunks.chunks is not set to 'initial'. A chunk is a group of modules. By default webpack will generate names using origin and name of the chunk (e.g. After running npm run build, let's explore the output in the dist directory. Imagine now if the x.js file had hundreds of lines of code! 利用Webpack模块可视化工具，项目中的依赖是这样的： 从上图可以看到：在开发环境整个构建包体积达到了19.44MB， echarts 、 antv 、 moment 这些包，体积都比较大，达到了MB量级，并且在项目中前两者使用频率很低，只有引用过一次，对于这种情况，考虑将依赖包 . Size threshold at which splitting is enforced and other restrictions (minRemainingSize, maxAsyncRequests, maxInitialRequests) are ignored. Think about this: how many of your users access every page of your app and use every possible feature of your app? All users are forced to download the whole app even though they rarely have use for it all. I thought of that too during my testing but size on disk is 32k. // Q: What kind of modules should new chunks contain? It is possible to create a folder structure by providing path prefixing the filename: 'js/vendor/bundle.js'. Let's spend a little time on examining the contents of dist. Why is that, though? Well, if the default cache group is disabled, then only modules from node_modules are taken into account. But it's explainable — webpack can not throw any error, cause webpack doesn't know, that script failed. © JS Foundation and other contributorsLicensed under the Creative Commons Attribution License 4.0. Create a custom vendor chunk, which contains certain node_modules packages matched by RegExp. But one last thing before i let you off. This configuration object represents the default behavior of the SplitChunksPlugin. For other cases splitChunks.minRemainingSize defaults to the value of splitChunks.minSize so it doesn't need to be specified manually except for the rare cases where deep control is required. Depending on the value of optimization.splitChunks.hidePathInfo it will add a key derived from the first module name or a hash of it. This issue is reproducible using my open source Chrome extension project located here: Considering the above information, we could load the 1000 lines of code only once by placing the x module in a new chunk. Alternatively, you may provide a function for more control. string = '~' 默认情况下，webpack 将使用 chunk 的来源和名称生成名称（例如 vendors~main.js）。此选项使你可以指定用于生成名称的 . There are many approaches to code splitting. Webpack will automatically split chunks based on these conditions: New chunk can be shared OR modules are from the node_modules folder New chunk would be bigger than 20kb (before min+gz) Maximum number of parallel requests when loading chunks on demand would be lower or equal to 30 There are many ways to optimize the load speed. Also If you are running this on a large project, you’ll see that you might get several bundles with dependencies. If you choose to specify a function, you may find the chunk.name and chunk.hash properties (where chunk is an element of the chunks array) particularly useful in choosing a name for your chunk. For instance, we could say: I'd want chunks to be created only from modules which come from node_modules and the chunks they form must have at least 1000 bytes. For this reason, we will have to check the initial diagram again: Apart from the fact that a chunk contains more modules, the concept of a chunk could be hard to picture. You can combine this configuration with the HtmlWebpackPlugin. maxSize option is intended to be used with HTTP/2 and long term caching. Once npm run build is invoked, we should see only one new chunk generated which unsurprisingly contains only the module x: We will end this section with a few small tasks that aim to clarify this option even more.Note: what follows is based on the above diagram that depicts the chunks and their modules. Both splitChunks.minSizeReduction and splitChunks.minSize need to be fulfilled for a chunk to be generated. So that it is usable when using long term caching and doesn't require records. // We're disabling it by setting it to false. It will be added to chunk's filename. Both splitChunks.minSizeReduction and splitChunks.minSize need to be fulfilled for a chunk to be generated. https://github.com/peardropsoftware/torrent2box. Are you sure you want to hide this comment? This is a rather complex topic, so this article aims to be a foundation for future articles since it goes over the main building blocks of the plugin, with the help of digestible diagrams and StackBlitz demos. Webpack 5 is introducing a new feature called Code Splitting, which offers an easier and more customizable way of splitting JS code. By using a separate chunk this will only happen once. By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. // The default cache groups that `SplitChunksPlugin` uses. via HTTP), for storing the modules and much more. This is what we can achieve by using SplitChunksPlugin. maxSize is only a hint and could be violated when modules are bigger than maxSize or splitting would violate minSize. All placeholders available in output.filename are also available here. Is this the case? Can a non-pilot realistically land a commercial airliner? Do Christian proponents of Intelligent Design hold it to be a scientific position, and if not, do they see this lack of scientific rigor as an issue? To extract a vendor . It isn't as flexible and can't be used to dynamically split code with the core application logic. Providing all can be particularly powerful, because it means that chunks can be shared even between async and non-async chunks. All such constraints could define a cache group and only chunks that fulfil all the cache group's conditions will be created. Allows to assign modules to a cache group by module type. When a chunk name is matched, all modules in the chunk are selected. The plugin has been replaced with automation and configuration. We have improved caching. Using maxSize (either globally optimization.splitChunks.maxSize per cache group optimization.splitChunks.cacheGroups[x].maxSize or for the fallback cache group optimization.splitChunks.fallbackCacheGroup.maxSize) tells webpack to try to split chunks bigger than maxSize bytes into smaller parts. // main.js contains all imports like Bootstrap etc... // But does not include anything already contained in vendors.js file, because of dependency, // DataTables are dependant on main.js because of Bootstrap, // Everything included in main.js or vendors.js will not be included again, // Magnific popup needs only jQuery, it is enough to depend on vendors.js only, // EasyMDE does not contain anything from files above, Adding events to calendar automatically from email. What is the current behavior? When it is true: analyse used exports for each runtime, when it is "global": analyse exports globally for all runtimes combined). The output is now like this: Now we have a separate bundle for our vendors! Depending on the value of optimization.splitChunks.hidePathInfo it will add a key derived from the first module name or a hash of it. However, this is the most scalable way of defining entry/entries in your application. Providing false will keep the same name of the chunks so it doesn't change names unnecessarily. The webpack.config.js file looks as follows: <> { mode: 'production', entry: { main: './src', }, output: { path: path.join(__dirname, 'dist'), filename: ' [name].js', clean: true, }, optimization: { // Instruct webpack not to obfuscate the resulting code minimize: false, splitChunks: false, }, context: __dirname, }; The legacy, webpack-specific approach is to use require.ensure. It was necessary to spend some time on comprehending how the default cache groups work, otherwise it would be though and challenging to control them in order to help SplitChunksPlugin achieve the results we are looking for. Size threshold at which splitting is enforced and other restrictions (minRemainingSize, maxAsyncRequests, maxInitialRequests) are ignored. Here is what you can do to flag arxeiss: arxeiss consistently posts content that violates DEV Community's Now a new bundle is created using the luxon.min.js. This might lead to bigger initial downloads and slow down page loads. Webpack will create its own script and any error will be processed without any timeouts. I've used lots of StackBlitz examples in this article to demonstrate notions. Controls which modules are selected by this cache group. // Note the usage of `[\\/]` as a path separator for cross-platform compatibility. What is a “chunk”? privacy statement. This technique is called code splitting. Last but not least, the chunks are framed in green blocks. Since webpack 5, passing an entry name to {cacheGroup}.test and using a name of an existing chunk for {cacheGroup}.name is no longer allowed. This can be achieved by placing the module in question in a separate chunk which will be loaded(fetched over the network as an HTTP request) only once.Now a question arises: what are the criteria based on which these separate chunks are created? What is the proper way to split the vendor so the user only downloads the packages he needs to run the page, and then webpack prefetches all the remaining packages in the background? What is the proper way to split the vendor so the user only downloads the packages he needs to run the page, and then webpack prefetches all the remaining packages in the background? Webpack will automatically split chunks based on these conditions: When trying to fulfill the last two conditions, bigger chunks are preferred. Also available for each cacheGroup: splitChunks.cacheGroups.{cacheGroup}.name. The default configuration was chosen to fit web performance best practices, but the optimal strategy for your project might differ. So, the priority option will help determine which unique chunk the module will belong to, while the other alternatives which the module could be part of are discarded. This chunk corresponds to the a-initial item in the entry object from the configuration file. And most importantly our users love it. It is recommended to try out the following configurations in the StackBlitz app that has been provided earlier. Clone repo, npm install Install a Webpack version that is v5.12. Site design / logo © 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Why have I stopped listening to my favorite album? vendors~main.js). Unusual characters in bibliography with T1 encoding. But I made an information system in the old way with HTML templates. If the splitChunks.name matches an entry point name, the entry point will be removed. This can affect the resulting file name of the chunk. This is what the webpack.config.js file should look like in order to activate SplitChunksPlugin with the default options: This solution can be found in this StackBlitz app(make sure to follow the instructions from the readme file). Assign modules to a cache group by module layer. When I run webpack, it stores luxon in the dist/assets directory with the name ba9f5c2186e41fc21fa3.js. Preload directive has a bunch of differences compared to prefetch: An example of this can be having a Component which always depends on a big library that should be in a separate chunk. Webpack v5.11.1 and earlier works correctly. Using webpackPreload incorrectly can actually hurt performance, so be careful when using it. It can be used to achieve smaller bundles and control resource load prioritization which, if used correctly, can have a major impact on load time. The next time it’s much quicker to load because they get a cache hit. @sokra hm, before 5.12.0 it created, but now no. Tried the code-splitting example from webpack documentation (Prevent Duplication). {cacheGroup}.maxInitialSize), or to the fallback cache group (splitChunks.fallbackCacheGroup.maxInitialSize). Create a commons chunk, which includes all code shared between entry points. In order to make these defaults cache groups a bit clearer, let's see the chunks they create in an example we've seen in a previous section, namely the one where SplitChunksPlugin was introduced. Making statements based on opinion; back them up with references or personal experience. Is there liablility if Alice startles Bob and Bob damages something? Tells webpack to ignore splitChunks.minSize, splitChunks.minChunks, splitChunks.maxAsyncRequests and splitChunks.maxInitialRequests options and always create chunks for this cache group. Do you find anything wrong with the below configuration? Actual priority is maxInitialRequest/maxAsyncRequests < maxSize < minSize. boolean = false function (module, chunks, cacheGroupKey) => string string. Feel free to refer to the diagram. The return value will indicate whether to include each chunk. If SplitChunksPlugin is used with the default options. This behavior can be unexpected. So that it is usable when using long term caching and doesn't require records. SplitChunkPlugin is able to figure out, based on some configuration, the modules which are too expensive to be duplicated and then put them in separate chunks so that the considerable efforts of loading large modules are done only once. the sum of the number of bytes for each constituent module). Here's a way to visualise this problem with the help of a diagram: A link for the above diagram can be found here. As a side note, the x module is not the only module which can belong to this new chunk, there can be others too. This can be useful in case of streaming server side rendering. Running webpack with following splitChunks configuration would also output a chunk of the group common with next name: commons-main-lodash.js.e7519d2bb8777058fa27.js (hash given as an example of real world output). Let's do an npm run build to see if it worked: Here are some other useful plugins and loaders provided by the community for splitting code: Two similar techniques are supported by webpack when it comes to dynamic code splitting. Note that this is a basic approach to split chunks and deduplication. Assuming the page-chunk is smaller and finishes faster, the page will be displayed with a LoadingIndicator, until the already requested charting-library-chunk finishes. // Instruct webpack not to obfuscate the resulting code, // The number of chunks the module must appear in, // Number of bytes put in a chunk(i.e. this is the y module. Let’s think about this interesting question: how many times do you think the x module(that corresponds to the x.js file and is imported into the a, b and c modules) will be copied in all these 5 resulting files? Providing a string or a function allows you to use a custom name. Webpack 5 can also use enhance-resolver to resolve paths while bundling. number = 20000 { [index: string]: number }. However, recall what fetching a chunk implies - an HTTP request. Let's see how this solution would look fit in a diagram: The barely visible red rectangles represent the replacements that have been made. The name of the split chunk. We didn't talk much about chunks and other adjacent concepts until this point, so we will review some of these ideas now. Split Imported Vendor files into a vendor bundle, Dynamically load/import split vendor chunks/bundles via Webpack, how to bundle the runtime chunk generated into explicit vendor chunk in Webpack 4. It is recommended to only include your core frameworks and utilities and dynamically load the rest of the dependencies. The CommonsChunkPlugin was used to avoid duplicated dependencies across them, but further optimizations were not possible. It is basically very easy yet powerful. When I run webpack, it stores luxon in the dist/assets directory with the name ba9f5c2186e41fc21fa3.js. this is the d module. To disable any of the default cache groups, set them to false. Avoid setting it globally. At the import calls this chunk is loaded in parallel to the original chunks. splitChunks.minRemainingSize option was introduced in webpack 5 to avoid zero sized modules by ensuring that the minimum size of the chunk which remains after splitting is above a limit. Let’s configure the plugin to create one bundle and only one bundle for the dependencies. It is the recommended value for production builds. 577), We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. For the sake of simplifying things, each example that we'll see will have one of the default cache groups disabled, so that we can focus on what that example is trying to emphasize. Also available for each cacheGroup: splitChunks.cacheGroups.{cacheGroup}.name. This is what the next section is about. For example, use name: "entry-name" to move modules into the entry-name chunk. This also serves as a base for investigating some of the SplitChunksPlugin's options that we have at our disposal. splitChunks.minRemainingSize only takes effect when a single chunk is remaining. I just set minsize to 5000 and this has fixed my issue. The green nested frames indicate a parent-child relationship between chunks. For example, use name: "entry-name" to move modules into the entry-name chunk. We've heard a few times phrases like module x appears in N different chunks. webpack是现代前端开发中最火的模块打包工具，只需要通过简单的配置，便可以完成模块的加载和打包。那它是怎么做到通过对一些插件的配置，便可以轻松实现对代码的构建呢？ Plugins：Loaders将各类型的文件处理成webpack能够处理的模块，plugins有着很强的能力。 Then, when module b requires x, those 1000 lines of code won't be loaded again and x will be retrieved directly from memory. Playing a game as it's downloading, how do they do it? Minimum size reduction to the main chunk (bundle), in bytes, needed for a chunk to be generated. Allows to override the filename when and only when it's an initial chunk. What's the reasoning behind this? Sets the size types which are used when a number is used for sizes. Note that it is applied to the fallback cache group as well (splitChunks.fallbackCacheGroup.chunks). This is a good start, you can tweak the SplitChunksPlugin in all eternity. / or \ in {cacheGroup}.test will cause issues when used cross-platform. See the code below with comments inside to get the basic idea of code splitting. edited When using the splitchunks.cacheGroups option with multiple entry points one of the vendor bundle files is not created. Sometimes you need to have your own control over preload. Maximum number of parallel requests at an entry point. Tells webpack to ignore splitChunks.minSize, splitChunks.minChunks, splitChunks.maxAsyncRequests and splitChunks.maxInitialRequests options and always create chunks for this cache group. What I like to do when learning a new concept is to start with a minimal project and play around there. It gets placed in a different chunk because it is belongs to the node_modules folder(so defaultVendors is once more accountable for the newly created chunk) and it appears in the async-b and async-a chunks. To learn more, see our tips on writing great answers. Simply I want to insert vendor scripts in my HTML template. This configuration says that all types of chunks will be applied to the plugin. For example, minSize: 0 will be inherited by both default and defaultVendors cache groups(the default cache groups). All these lines would be copied in 3 different places - this seems like a waste of resources. Then run your webpack build in debug mode to inspect the parameters in Chromium DevTools. a predicate function that will determine which chunk will be considered; here we can filter out chunks by using many of the chunk's properties: its name, its constituent modules etc. We pay the cost of an additional request, which could be considered a tradeoff. The plugin should notice that we've separated lodash out to a separate chunk and remove the dead weight from our main bundle. It will inject all the generated vendor chunks for you. and later. Specifying either a string or a function that always returns the same string will merge all common modules and vendors into a single chunk.
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