Learn how to add the Internationalization Polyfill to a Angular CLI Project
Angular has great features out of the box that make developing web applications much easier. One of the great abilities of Angular is Internationalization (Intl) support. Many of Angular features such as the built in currency and date pipes use Internationalization to automatically display the appropriate currency format to users in different geo locations/regions.
If you have played with Angular latest 2.x+ at all you may of run into a strange error about
Intl just yet. So to fix this there are a couple of things we need to do to support those browsers.
Polyfill, Polyfill, Polyfill
So how do we add
Intl support to our Angular app? Well specifically we will focus on using a Angular CLI project. The techniques we will cover can apply to Webpack and other build systems as well.
The first option which is also the easiest is simply adding a script tag to your
index.html. No really that's all it takes!
Now you have
Intl support in all your browsers. polyfill.io is a nifty service that will only load the polyfill if the requested browser actually needs it. This is a pretty good solution but what if you want your polyfill to be bundled with your scripts? You potentially get better performance and your application doesn't rely on a third party CDN that if it goes down it takes your app down with it. So whats the next option?
Well with the Angular CLI its actually quite easy. First we will use
npm to install the
Intl polyfill directly into our Angular app. To do this run
npm install intl --save. Once installed in your Angular CLI project go to the
/src/polyfills.ts file. In here you can add the following lines.
That's it! Now when your project builds it will add the
Intl polyfill and the English language service. You can add more language support by importing more language files. Now the downside to this is even if the browser supports
Intl it still has to download the code. You could potentially mitigate this using feature detection and dynamic loading. The great part about polyfilling is as browser support for
Intl gets better we will be able to drop the dependency all together!