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How does bundling of JavaScript work in Magento?
Bundling accomplishes this by merging multiple JavaScript files together into one file to reduce the number of page requests. JavaScript bundling does not work unless Magento is in production mode. Once in production mode, JavaScript bundling can only be enabled using the CLI. Follow these steps to setup JavaScript bundling from the CLI.
How long does it take to load Magento bundle?
At Slow 3G connectivity, it takes about 44 seconds to load all the bundles for the homepage of a clean Magento installation. The same is true when merging the bundles into a single file. Users could still wait around 42 seconds for the initial page load as shown here:
What happens when you merge two JavaScript files in Magento?
When you enable both bundling and merging, Magento creates a single JavaScript file: The previous bundled and merged load times look great in a development environment. But in the real world, many things can slow down rendering: slow connections, large connection thresholds, limited networks.
What does it mean to bundle a JavaScript file?
JavaScript bundling is an optimization technique you can use to reduce the number of server requests for JavaScript files. Bundling accomplishes this by merging multiple JavaScript files together into one file to reduce the number of page requests. JavaScript bundling does not work unless Magento is in production mode.
When to use Deps or Ui / template in Magento?
The path for Magento_Ui/templates is set to be ui/template in the requirejs-config.js module of module_ui, hence ui/template is used for specifying the path. If no paths are set, /templates should be used. The deps configuration is used to add a dependency.
Is there a way to enable merge in Magento?
To enable Magento’s built-in merging from the command line: This command merges all synchronous JavaScript files into one file. Enabling merging without also enabling bundling is not useful because Magento uses RequireJS. If you don’t enable bundling, Magento only merges RequireJS and its configuration.
How to exclude a JavaScript file in Magento?
The node in the etc/view.xml file for a theme specifies the files to exclude from the Magento JavaScript bundling process. JavaScript files excluded from bundling are loaded asynchronously by RequireJS as needed. As such, you should exclude the JavaScript files you use for testing or development so that they are not loaded on every page.
Where to find a mixin file in Magento?
Mixins are JavaScript files located under the web/js directory under an area specific directory. The mixin file can be nested under more directories as long as those directories are under web/js. A mixin in Magento is written as an AMD module that returns a callback function.
Which is native Magento mechanism distributes all JavaScript assets?
This is a native Magento mechanism that combines all assets present in the system and distributes them among same-sized bundles (bundle_0.js, bundle_1.js … bundle_x.js): Better, but the browser still loads ALL the JavaScript bundles, not just the ones needed.
How big should a bundle file be in Magento?
Specifying a smaller bundle_size generates more bundles with a smaller file sizes. The goal is to balance the number of bundles to download with the size of each bundle. As a rule of thumb, each bundle should be at least 100 kB. There are many ways to tune your theme using the etc/view.xml file.
How to reduce the number of server requests in Magento?
Out of the box, Magento provides two ways to reduce the number of server requests: merging and bundling. These settings are turned off by default. You can turn them on within Magento’s Admin UI in Stores > Settings > Configuration > Advanced > Developer > JavaScript Settings, or from the command line.
Why do we need RequireJS in Magento 2?
While RequireJS did help us with reducing number of requests through the page, we still have few JS files being loaded and “few” in Magento 2 means 40-50. We need a way to merge those assets into just few files.
How does magepack work with JavaScript in Magento 2?
Magepack needs to analyse pages from your Magento 2 store to determine the Javascript files your store is using and how they can be bundled. It saves this information in a configuration file called magepack.config.js.
What to do when Magento is in production mode?
Modifying the settings above when Magento is in production mode will require static view files deployment: Finally, clear the cache: For example, when Sign Static Files is disabled (which is the default: config:set dev/static/sign 0 ), the URL to a static file might look like this: /static/frontend/Magento/luma/en_US/mage/dataPost.js.