The combined size of the es2015.js files is about 7.6 MB and the combined size of the es5.js files is around 9.4 MB. These numbers show that Angular 9 shaved off 9 KB from each production build. The rate function just gets all the possible ratings’ stars and clicks on the one corresponding to the value sent. Install the Angular Material Tic-Tac-Toe Game.
After the terminal completes the build, take a look at the files in dist/material-tic-tac-toe.
It might sound insane but 63% of all US online traffic comes from smartphones and tablets.
To do this, open the terminal in the base directory of the Tic-Tac-Toe app and run the update command as follows. To do that, in app.component.ts, we’ll get the data from the collection: …and in app.component.html, we’ll add a list of ratings: This is what our Angular 9 tutorial app looks like when it’s all put together. Replace {ClientId} with the client ID that you saw in the previous step. The word was Ivy. The application now uses Ivy with all its advantages. One is compatible with legacy browsers, and the other is compiled targeting ES2015, which uses newer APIs and requires fewer polyfills to run on browsers. One last thing before we run the tests. Give it a TRY! Angular Ivy allows us to have errors presented in a clearer way and helps enforce TypeScript typing in our code. As a result, the distributed code will be much smaller and the loading times of your application will improve.
Now, if we run ng serve again, we can see it in action. With all these massive changes behind the scenes, you might be scared and wonder how much you would need to refactor your code to be compatible with Ivy. The Angular team completely redesigned its compiler, resulting in faster builds, faster test runs, smaller bundle sizes, and most importantly, backward compatibility with older versions. Depending on your system, you may have to run this command using sudo. Along the way, we saw which improvements and new features are included on Angular 9 and Angular Ivy.
If you run a Lighthouse audit (Chrome Developer Tools > Audits > Generate report), you’ll see that the version ng serve produces is far from performant.
ComponentHarness requires a static field, hostSelector, which should take the value of the component’s selector. We can fix this error by wrapping the service call with setTimeout: To understand why the ExpressionChangedAfterItHasBeenCheckedError error happens and explore other possibilities, Maxim Koretskyi’s post on the topic is worth reading. Or, are modules optional now? This improves development times since recompiling an application will only involve compiling the components that changed.
Ivy has been around in a preview version since Angular 8, but you previously had to manually opt into using the new engine. NOTE: You can find the calculations for these comparison numbers in this Gist.
Ivy also has a very big focus on tree-shaking. This is the process in which the TypeScript compiler looks at your code and figures out exactly which libraries are needed and then eliminates any unused code. To do that, we will run: Now, if we run ng serve, we’ll see the app running with its initial scaffolding. Upgrading to Angular 9 with Ivy.
In Ivy that becomes much more simpler, every component now references child components or directives though much more cleaner public API.
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