browserslistrcīoth of these formats contain the same query: Tools use Browserslist through either an entry in package. Luckily, there’s a configuration tool called browserslist that does nearly all of the heavy lifting for you.īrowserslist works with tools like Babel and is essentially a configuration tool that accepts query strings, which it runs against Can I Use data.
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To pull this off, your bundler (like Webpack) and your transpiler or compiler (like Babel or TypeScript) must work together to divide up your code and add the correct polyfills in the right places. It turns out that splitting up your bundle for differential loading is a combination of art and science. In fact, if your users are around the world, they may not even use browsers you’ve heard of - Opera Mini has over 100 million users in Africa! Beyond that, your users may not use the same browser you do. Unfortunately, not all browsers support all the same features of JavaScript. “Easy,” you think, “I’ll just plug the transpiled code into the nomodule tag and the original into the module tag.” Well, it’s not quite that simple.
You’ve probably surmised by now that, in order to take advantage of differential loading, you’ll need to divide up your JavaScript code based on browser support. Source How You Normally Set Up Differential Loading Likewise, when an older browser sees this, it won’t recognize the module type and only load legacyBundle. When a modern browser (like a new version of Chrome) runs across this, it will know to only load fancyModernBundle. Sounds cool, right? How does this work? Modern browsers have the ability to interpret a module type in the script HTML tag and to ignore a nomodule attribute. This way, newer browsers aren’t punished for legacy browsers by having to load a massive bundle, but legacy browsers aren't left in the dust. On legacy browsers, we’ll need both transpiled code and more polyfills to make things work.
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On a newer browser that supports recent syntax changes in JavaScript (such as arrow functions in ES2015 or async functions in ES2017), it’d be great to ship to code as-is with as few polyfills as possible to keep download time low. This generally translates into two things: modern syntax and polyfills. In a nutshell, differential loading means to send newer, flashier code to newer browsers and stable legacy code to legacy browsers. Like most buzzwords in tech, the term “differential loading” is completely opaque about what it actually means. "Angular 8 is here! It features differential loading, better support for web workers, and much more." What is that? Why does it matter? What do I need to do about it (if anything)? In this article, I want to dive into that last one: differential loading. Differential loading is turned on in the CLI by default.There’s a new Deprecation Guide to assist users with updating Angular.The Angular team has created a simplified Getting Started Guide.The new unified location service improves migration from the AngularJS $location service.You can even perform this automatically for your app with the angular -lazy -routes -fix tool. Rather than using the “magic string” syntax specific to Angular to do lazy loading, you’ll be able to use the standard import ( ) syntax.
There’s improved support for web workers, such as the ability to generate them from the CLI and use them in your application.For example, you’re now able to deploy to Firebase and other providers from the CLI. Builders allow you to extend and customize the CLI.No, Bazel isn’t ready yet (it’s an opt-in preview).No, Ivy isn’t ready yet (it’s an opt-in preview).Rather than throw my own take on the pile, I’ll refer you to the official Angular release announcement but here are the high points: Differential loading lets you serve up different bundles to different browsers and make your application even faster!Īngular 8 has only been out for about a week at the time I’m writing this, but there’s already been 17,000 “What’s New” articles published. TL DR: Angular 8 is here! Learn all about one of its coolest new features: differential loading.
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