Skip to main content

AngularDart 4

AngularDart v4 is now available. We've been busy since the release angular2 v3.1.0 in May. Not only did we "drop the 2", but we also improved the compiler and tightened up the framework to give you smaller code, we updated the package structure to improve usability, and we added several new features. Check out the updated documentation to get started.

Just angular

Upgrading to v4 will require more than updating your version constraint. The package has changed names (back) to angular – dropping the 2. You'll need to update your pubspec.yaml and the corresponding imports in your code. In most instances, find-and-replace should do the trick. Going forward, the package will be called package:angular. We'll just update the version number.

Smaller code

The updated compiler in 4.0 allows type-based optimizations that not only improve runtime performance but generate better code because we are able to strongly type templates. A big result of the update is that many applications will see compiled JavaScript sizes drop. In one case, we saw a 40KB (~10%) size drop in minified JavaScript by simply upgrading to v4. Every application is different, but we expect most applications will experience some code size reduction.

Separation of concerns

Until now, AngularDart was a single package that contained not only core functionality, but also routing, forms, and testing. We've separated these libraries into separate packages:
The code is managed under one repository, but each package can be used, versioned, and released separately. A breaking change in package:angular_forms won't require a breaking release of package:angular, for example. Having clear boundaries between packages also simplifies interdependencies between libraries, allowing dart2js to generate more efficient JavaScript.

New features

Besides being renamed and refactored, AngularDart v4 includes a number of new features. A couple of examples:
Functional directives. A lightweight and stateless way to apply one-time transformations.
@Directive(selector: '[autoId]')
void autoIdDirective(Element element,
IdGenerator generator) {
  element.id = generator.next();
}
Metadata inheritance. Inheritance for both component and directive metadata is now complete! Any field- or method-level annotations are now inherited through supertypes. Check out Leon's write-up of this feature and how it can help you.

Updated components

The angular_components package has also been updated to use AngularDart v4. The update contains new components and updates for existing components. Go to the component gallery to see examples of many of the components in action.

Jump in

To get started with AngularDart, check out the documentation. Post questions to StackOverflow and Gitter. Check out the code and file issues on our GitHub repository.

Popular posts from this blog

Dart in 2016: The fastest growing programming language at Google, 2nd fastest growing in TIOBE Index

Dart was the fastest growing programming language at Google in 2016 with millions of lines of code written. It also made it to TIOBE Index Top 20 this month (see TIOBE's methodology).

It takes time to build something as ambitious as Dart and, in some ways, Dart is still in its infancy. But we're glad the hard work is starting to pay off.

Many thanks to our amazing community!

We're going to celebrate by ... releasing 1.22 next week (as per our usual 6 week release schedule).

A stronger Dart for everyone

We are constantly asking ourselves:
How do we make developers even more productive when writing Dart apps? We believe that a critical part of the answer to this question is to make strongmode – a sound static type system for Dart – the standard for all Dart developers.

Teams that use Dart to build apps like Soundtrap, AdWords, AdSense, and Greentea say they really enjoy using strong mode features, such as early error detection. In fact, teams that have switched completely to strong mode cite not only early error detection but also better code readability and maintainability as major benefits. We hear this both from small teams and Рeven more so Рfrom large teams with hundreds of developers writing and maintaining millions of lines of Dart code. As Björn Sperber from Soundtrap says,
Strong mode and the smooth integration with IntelliJ is a joy to use and a huge improvement. If you’ve tried out Flutter, you’ve already used strong mode checks from the Dart analyzer.

Given the benefits …

AngularDart 2.1 and new Components

AngularDart got its own dedicated team 5 months ago. Last month, we launched 2.0 final on the Dart Developer Summit. Today, we’re releasing the first minor release after that: 2.1.

Since the focus of AngularDart is Productivity, Performance, Stability, there are no major breaking changes (see the changelog) — but a lot of behind-the-scenes improvements. Your apps will get slightly smaller and faster (even relative to 2.0 which already made huge strides in size and performance since the compiled-from-TypeScript days).

Many features that AngularJS had to implement for JavaScript and TypeScript are not needed in Dart (because Dart already has those features out-of-the-box). So we’re removing them from AngularDart. Renderer is deprecated in favor of plain-old dart:html. NgPlural is going away — Dart programs can use the package:intl library.

New components

On the Dart Developer Summit, we launched AngularDart Components — the material design widgets Google is using in customer-facing apps …