angular 5.0.0-beta+3 changelog

5.0.0-beta+3 #

Other improvements #

Removed dependency on package:tuple.

5.0.0-beta+2 #

New features #

Added support for named arguments in function calls in templates:
```
<span>Hello {{getName(includeExclamationPoint: true)}}</span>
```

NOTE: Because of the collision of syntax for both named arguments and pipes, any pipes used as the value of a named argument need to be wrapped in parentheses: func(namedArg: (pipeName | pipeVar:pipeVarValue)).

Bug fixes #

Changed the behavior of warnings around @ViewChildren(...). It was more difficult than originally thought to warn on incorrect selector usage due to the semantics of components and dependency injection. In many cases false positives were flagged. Now, any unknown type is just ignored (it may still be invalid), and any invalid value throws a build error. For example:
```
class A {
  // Might not be valid, but we no longer warn.
  @ViewChildren(SomeArbitraryType)
  List<SomeArbitraryType> someTypes;

  // We throw a build error.
  @ViewChildren(1234)
  List thisDoesNotWork;
}
```

Implicit static tear-offs and field invocations are now supported:

@Component(
  selector: 'example',
  template: '''
    <!-- Invoking an implicit static field. -->
    <div>{{field()}}</div>

    <!-- Binding an implicit static tear-off. -->
    <div [invoke]="tearOff"></div>
  ''',
)
class ExampleComponent {
  static String Function() field = () => 'Hello world';
  static String tearOff() => 'Hello world';
}

5.0.0-beta+1 #

New features #

A warning is produced if the compiler removes any elements (such as <script>) from your template. This may become an error in future versions of AngularDart. Closes #1280.
A warning is produced if the selector provided to a query (such as @ViewChildren(...)) is invalid and will not produce any elements at runtime. This may become an error in future versions of AngularDart. Closes #1220.
It is now possible to annotate parts of a template with @preserveWhitespace instead of opting into preserving whitespace for the entire template. Closes #1295:
```
<div>
  <div class="whitespace-sensitive" @preserveWhitespace>
    Hello
    World!
  </div>
</div>
```
Added package:angular/meta.dart, a series of utilities for additional static analysis checks and/or functions to retain semantics for migration purposes, starting with castCallback1ForDirective and castCallback2ForDirective. These methods are only intended to be used as stop-gaps for the lack of generic support in AngularDart directives and components. Closes #1489.

Bug fixes #

Fails the build immediately if an element in a component's pipes list is unresolved.
Support inherited method tear-offs in event listeners. Previously, we only considered methods in the Component class itself. Closes #506.
Fixed a bug where [attr.name.if] did not work on a static @HostBinding. Closes #1484.

Other improvements #

Fixed a bug where many queries (@ViewChildren() and the like) generated additional runtime casts in production mode. Now in Dart2JS with --omit-implicit-checks the casts are removed.
Emits more optimized code when there are multiple data bindings in a row that are checked only once (such as final strings). Previously we generated redundant code.
Fixed an optimization issue when @ViewChild() or @ContentChild() was used on a nested element (i.e. inside a <template>). The code that was produced accidentally created two queries instead of one. Closes #1455.

5.0.0-beta #

Welcome to the first release candidate of AngularDart v5.0.0, with full support for Dart 2. Please note that an up-to-date copy of dev channel Dart SDK is required (at least 2.0.0-dev.65 as of this writing) to use this version of AngularDart. Additionally:

Dartium is no longer supported. Instead, use the new DartDevCompiler
Pub transformers are no longer used. Instead, use the new webdev CLI, or, for advanced users, the build_runner CLI.

More details of changes to Dart 2 for web users are available on our webiste.

We are no longer expecting further breaking changes as we get closer to a final release (which itself is pending a final release of the Dart 2 SDK). Please continue to report stability issues, bugs, or requests for small non-breaking enhancements.

Thanks, and enjoy AngularDart!

Dependency Injection #

Dependency injection was enhanced greatly for 5.0.0, primarily around using proper types (for Dart 2), and paths to enable much smaller code size (for everyone).

New features

Provider (and provide) are soft deprecated, and in their place are four new classes with more precise type signatures. Additionally, Provider now supports an optional type argument <T>, making it Provider<T>.
- ValueProvider(Type, T) and ValueProvider.forToken(OpaqueToken<T>, T) instead of Provider(typeOrToken, useValue: ...).
- FactoryProvider(Type, T) and FactoryProvider.forToken(OpaqueToken<T>, T) instead of Provider(typeOrToken, useFactory: ...).
- ClassProvider(Type, useClass: T) and ClassProvider.forToken(OpaqueToken<T>, useClass: T) instead of Provider(typeOrToken, useClass: ...) or an implicit Type.
- ExistingProvider(Type, T) and ExistingProvider.forToken(OpaqueToken<T>, T) instead of Provider(typeOrToken, useExisting: ...).

OpaqueToken is now much more useful. Previously, it could be used to define a custom, non-Type to refer to something to be injected; commonly instead of types like String. For example, you might use an OpaqueToken to refer to the a URL to download a file from:

const downloadUrl = OpaqueToken('downloadUrl');

@Component(
  providers: [
    Provider(downloadUrl, useValue: 'https://a-site.com/file.zip'),
  ],
)
class Example {
  Example(@Inject(downloadUrl) String url) {
    // url == 'https://a-site.com/file.zip'
  }
}

First, OpaqueToken adds an optional type argument, making OpaqueToken<T>. The type argument, T, should be used to refer to the Type of the object this token should be bound to:

const downloadUrl = OpaqueToken<String>('downloadUrl');

Coupled with the new named Provider classes and their .forToken named constructor (see below), you now also have a way to specify the type of providers using type inference:

@Component(
  providers: [
    // This is now a Provider<String>.
    ValueProvider.forToken(downloadUrl, 'https://a-site.com/file.zip'),
  ],
)

Second, MultiToken<T> has been added, and it extends OpaqueToken<List<T>>. This is an idiomatic replacement for the now deprecated multi: true argument to the Provider constructor:

const usPresidents = MultiToken<String>('usPresidents');

@Component(
  providers: [
    ValueProvider.forToken(usPresidents, 'George'),
    ValueProvider.forToken(usPresidents, 'Abe'),
  ],
)
class Example {
  Example(@Inject(usPresidents) List<String> names) {
    // names == ['George', 'Abe']
  }
}

Third, we heard feedback that the String-based name of tokens was insufficient for larger teams because the names could collide. Imagine 2 different tokens being registered with a name of 'importantThing'! It is now possible (but optional) to extend either OpaqueToken or MultiToken to create scoped custom token names:

class DownloadUrl extends OpaqueToken<String> {
  const DownloadUrl();
}

class UsPresidents extends MultiToken<String> {
  const UsPresidents();
}

class Example {
  providers: const [
    ValueProvider.forToken(DownloadUrl(), 'https://a-site.com/file.zip'),
    ValueProvider.forToken(UsPresidents(), 'George'),
    ValueProvider.forToken(UsPresidents(), 'Abe'),
  ],
}

Fourth, and finally, we'd like to repurpose @Inject in the future, and let you write less to inject tokens. So, OpaqueToken and MultiToken instances may now be used directly as annotations:

class Example {
  Example(@DownloadUrl() String url, @UsPresidents() List<String> names) {
    // url == 'https://a-site.com/file.zip'
    // names == ['George', 'Abe']
  }
}

InjectorFactory, a function type definition of Injector Function([Injector parent]), was added and started to be used across the framework. It normally indicates the ability to create a new Injector instance with an optional parent.
A new annotation, @GenerateInjector, was added. It is now posibble to generate, at compile-time, a standalone InjectorFactory method for providers, without explicitly wrapping in an @Component:
```
// example.dart

import 'example.template.dart' as ng;

@GenerateInjector([
  ClassProvider(HelloService),
])
final InjectorFactory rootInjector = ng.rootInjector$Injector;
```
Module has been added as a new, more-typed way to encapsulate a collection of Provider instances. This is an optional feature to use instead of nested const lists to represent shared providers. For example:
```
const httpModule = [ /* Other providers and/or modules. */ ];

const commonModule = [
  httpModule,
  ClassProvider(AuthService, useClass: OAuthService),
  FactoryProvider.forToken(xsrfToken, useFactory: readXsrfToken),
];
```
... you can represent this with the new typed Module syntax:
```
const httpModule = Module( /* ... Configuration ... */);

const commonModule = Module(
  include: [httpModule],
  provide: [
    ClassProvider(AuthService, useClass: OAuthService),
    FactoryProvider.forToken(xsrfToken, useFactory: readXsrfToken),
  ],
);
```
The advantages here are numerous:
- Less ambiguity around ordering of providers. Engineers would tend to try and sort providers alphabetically, would of course, would lead to problems. Module specifically outlines that order is significant, and that include is processed before provide.
- Module rejects using a Type implicitly as a ClassProvider. This removes additional ambiguity around supporting List<dynamic>, and while more verbose, should lead to more correct use.
- Module tends to be more understandable by users of other dependency injection systems such as Guice or Dagger, and reads better than a const List (which is a very Dart-only idiom).
NOTE: It is also possible to use Module in @GenerateInjector:
```
@GenerateInjector.fromModules([
  commonModule,
])
final InjectorFactory exampleFromModule = ng.exampleFromModule$Injector;
```
NOTE: It is also possible to use Module in ReflectiveInjector:
```
// Using ReflectiveInjector is strongly not recommended for new code
// due to adverse effects on code-size and runtime performance.
final injector = ReflectiveInjector.resolveAndCreate([
  commonModule,
]);
```

Breaking changes

OpaqueToken no longer overrides operator== or hashCode. In practice this should have no effect for most programs, but it does mean that effectively that only const instances of OpaqueToken (or MultiToken) are valid.
It is no longer valid to provide a token type of anything other than Type or an OpaqueToken (or MultiToken). In the past anything from aribtrary literals (such as a string - 'iAmAToken') or a custom const instance of a class were supported.
For defining whether a component or directive should provide itself for injection, Visibility.none has been renamed Visibility.local to make it more clear that it is accessable locally (within providers for example).
Classes annotated with @Component or @Directive are no longer treated like services annotated with @Injectable, and not accessible (by default) to ReflectiveInjector. @Injectable can always be added to these classes in order to return to the old behavior.

Bug fixes

Fixed a bug where calling get on an Injector injected in the context of an @Component or @Directive-annotated class and passing a second argument always returned null (instead of that second argument) if the token was not found.
Setting @Component(visibility: Visibility.none) no longer applies to providers, if any. Note that Visibility.none was always renamed Visibility.local in breaking changes above.
Fixed a bug where Provider(SomeType) was not parsed correctly as an implicit use of Provider(SomeType, useClass: SomeType).
Fixed a bug where <ReflectiveInjector>.get(X) would throw with a message of no provider found for X, even when the acutal cause was a missing downstream dependency Y. We now emit the correct message.

Other improvements

Some injection failures will display the chain of dependencies that were attempted before a token was not found ('X -> Y -> Z') in development mode. We are working on making sure this better error message shows up always but it is likely to slip until after the v5 release.
It is no longer a build warning to have an @Injectable-annotated service with more than one constructor. This was originally meant to keep injection from being too ambiguous, but there are understood patterns now (first constructor), and there is no alternative present yet. We may re-add this as a warning if there ends up being a mechanism to pick a constructor in the future.
It is no longer a build warning to have @Injectable-annotated services with named constructor parameters. While they are still not supported for injected, they were always successfully ignored in the past, and showing a warning to the user on every build served no purpose.
If a private class is annotated with @Injectable() the compiler fails. In practice this caused a compilation error later in DDC/Dart2JS, but now the AngularDart compiler will not emit invalid code.
Removed spurious/incorrect warnings about classes that are used as interfaces needing @Injectable (or needing to be non-abstract), which are wrong and confusing.
The compiler behind initReflector() has changed implementations and now uses fully-scoped import statements instead of trying to figure out the original scope (including import prefixes) of your source code. This was not intended to be a breaking change.

Components and Templates #

New features

NgTemplateOutlet added ngTemplateOutletContext for setting local variables in an embedded view. These variables are assignable to template input variables declared using let, which can be bound within the template. See the NgTemplateOutlet documentation for examples.
Added a lifecycle event AfterChanges, which is similar to OnChanges, but with a much lower performance cost - it does not take any parameters and is suitable when you have multiple fields and you want to be notified when any of them change:
```
class Comp implements AfterChanges {
  @Input()
  String field1;

  @Input()
  String field2;

  @override
  void ngAfterChanges() {
    print('Field1: $field1, Field2: $field2');
  }
}
```

It is possible to directly request Element or HtmlElement types from content or view children instead of ElementRef (which is deprecated). For example:

@Component(
  selector: 'uses-element',
  template: '<div #div>1</div>'
)
class UsesElement {
  @ViewChild('div')
  // Could also be HtmlElement.
  Element div;
}

Additionally, List<Element> and List<HtmlElement> for @ViewChildren and @ContentChildren no longer require read: Element, and the type is correctly inferred the same as a single child is.

Static properties and methods of a component may now be referenced without a receiver in the component's own template. For example:

Before: ExampleComponent as receiver is necessary.

@Component(
  selector: 'example',
  template: '<h1>{{ExampleComponent.title}}</h1>',
)
class ExampleComponent {
  static String title;
}

After: No receiver is necessary.

@Component(
  selector: 'example',
  template: '<h1>{{title}}</h1>',
)
class ExampleComponent {
  static String title;
}

@HostListener() can now automatically infer the const ['$event'] parameter when it is omitted but the bound method has a single argument:
```
class Comp {
  @HostListener('click')
  void onClick(MouseEvent e) {}
}
```

Added <ng-container>, an element for logical grouping that has no effect on layout. This enables use of the *-syntax for structural directives, without requiring the cost an HTML element.

Before

<ul>
  <template ngFor let-user [ngForOf]="users">
    <li *ngIf="user.visible">{{user.name}}</li>
  </template>
</ul>

After

<ul>
  <ng-container *ngFor="let user of users">
    <li *ngIf="user.visible">{{user.name}}</li>
  </ng-container>
</ul>

In dev mode only, an attribute named from is now added to each <style> tag whose value identifies the source file URL and name of the component from which the styles originate.
Support for the suffix .if for attribute bindings, both in a template and in a @HostBinding(). Accepts an expression of type bool, and adds an attribute if true, and removes it if false and closes https://github.com/dart-lang/angular/issues/1058:
```

<button [attr.disabled]="isDisabled ? '' : null"></button>
<button [attr.disabled.if]="isDisabled"></button>
```
Add support for tear-offs in event handlers in the templates.

BEFORE: <button (onClick)="clickHandler($event)">

AFTER: <button (onClick)="clickHandler">

Breaking changes

We now have a new, more stricter template parser, which strictly requires double quotes ("...") versus single quotes, and in general enforces a stricter HTML-like syntax. It does produce better error messages than before.
We removed support for ngNonBindable in the new template syntax.
The fields inputs:, outputs:, and host: have been removed from @Directive(...) and @Component(...). It is expected to use the member annotations (@Input(), @Output(), @HostBinding(), @HostListener()) instead.
The default for @Component(preserveWhitespace: ...) is now true. Many improvements were put into the whitespace optimziation in order to make the results easier to understand and work around.
<AsyncPipe>.transform no longer returns the (now removed) WrappedValue when a transformed result changes, and relies on regular change detection.
Pipes no longer support private types in their transform method signature. This method's type is now used to generate a type annotation in the generated code, which can't import private types from another library.
Using @deferred no longer supports the legacy bootstrap processes. You must use runApp (or runAppAsync) to bootstrap the application without relying on initReflector().
<ComponentRef>.componentType always throws UnsupportedError, and will be removed in a later minor release. This removes our last invocation of .runtimeType, which has potentially severe code-size implications for some apps.

QueryList for @ViewChildren and @ContentChildren has been removed, in favor of just a plain List that is replaced with a new instance when the children change (instead of requiring a custom collection and listener):

class Comp {
  @ViewChildren(ChildComponent)
  set viewChildren(List<ChildComponent> viewChildren) {
    // ...
  }

  // Can also be a simple field.
  @ContentChildren(ChildComponent)
  List<ChildComponent> contentChildren;
}

EventEmitter was removed in favor using Stream and StreamController.
COMMON_DIRECTIVES was renamed commonDirectives.
CORE_DIRECTIVES was renamed coreDirectives.
COMMON_PIPES was renamed commonPipes.
Private types can't be used in template collection literals bound to an input. This is a consequence of fixing a cast warning that is soon to be an error caused by the code generated for change detecting collection literals in templates. See https://github.com/dart-lang/angular/issues/844 for more information.
SafeInnerHtmlDirective is no longer injectable.
The following types were never intended for external use and are no longer exported by package:angular/security.dart:
- SafeHtmlImpl
- SafeScriptImpl
- SafeStyleImpl
- SafeResourceUrlImpl
- SafeUrlImpl
- SafeValueImpl
To mark a value as safe, users should inject DomSanitizationService and invoke the corresponding bypassSecurityTrust*() method, instead of constructing these types directly.
ComponentResolver was removed, and SlowComponentLoader was deprecated.
Methods in lifecycle hooks have void return type. This is breaking change if the override doesn't specify return type and uses return without any value. To fix add a void or Future<void> return type to the override:
```
class MyComp implements OnInit {
  @override
  void ngOnInit() {
    // ...
  }
}
```

Removed the rarely used template attribute syntax. Uses can be replaced with either the * micro-syntax, or a <template> element.

Before

  <div template="ngFor let item of items; trackBy: trackById; let i=index">
    {{i}}: {{item}}
  </div>

After

<!-- * micro-syntax -->
<div *ngFor="let item of items; trackBy: trackById; let i=index">
  {{i}}: {{item}}
</div>

<!-- <template> element -->
<template
    ngFor
    let-item
    [ngForOf]="items"
    [ngForTrackBy]="trackById"
    let-i="index">
  <div>
    {{i}}: {{item}}
  </div>
</template>

It is now a compile error to implement both the DoCheck and OnChanges lifecycle interfaces. DoCheck will never fill in values for the Map in OnChanges, so this compile-error helps avoid bugs and directs the user to use DoCheck and AfterChanges instead.
Using a suffix/unit for the [attr.name.*] syntax other than the newly introduced [attr.name.if] is now a compile-error. These binding suffixes were silently ignored (users were likely confused with [style.name.px], which is supported).

Bug fixes

Fixed a bug where an @deferred components were still being linked to in initReflector().
Fixed a bug where errors thrown in event listeners were sometimes uncaught by the framework and never forwarded to the ExceptionHandler.
Fixed a bug where DatePipe didn't format millisecondsSinceEpoch in the local time zone (consistent with how it formats DateTime).
Testability now includes ComponentState updates. Due to prior use of animationFrame callback, NgTestBed was not able to detect a stable state.
String literals bound in templates now support Unicode escapes of the form \u{?-??????}. This enables support for Unicode supplementary planes, which includes emojis!
Inheriting from a class that defines a @HostBinding() on a static member no longer causes the web compiler (Dartdevc or Dart2JS) to fail. We previously inherited these bindings and generated invalid Dart code. Given that static members are not inherited in the Dart language, it made sense to give a similar treatment to these annotations. Instance-level members are still inherited:
```
class Base {
  @HostBinding('title')
  static const hostTitle = 'Hello';

  @HostBinding('class')
  final hostClass = 'fancy';
}

// Will have DOM of <fancy-button class="fancy"> but *not* title="Hello".
@Component(
  selector: 'fancy-button',
  template: '...',
)
class FancyButton extends Base {}
```
Fixed a bug where a recursive type signature on a component or directive would cause a stack overflow. We don't support generic type arguments yet (the reified type is always dynamic), but the compiler no longer crashes.

Other improvements

Types bound from generics are now properly resolved in a component when inheriting from a class with a generic type. For example, the following used to be untyped in the generated code:
```
class Container<T> {
  @Input()
  T value;
}

class StringContainerComponent implements Container<String> {}
```
Both ComponentFactory and ComponentRef now have a generic type parameter <T>, which is properly reified where T is the type of the component class.
The $implicit (iterable) value in *ngFor is now properly typed whenever possible. It was previously always typed as dynamic, which caused dynamic lookups/calls at runtime, and hid compilation errors.
The type of <EmbeddedViewRef>.rootNodes and <ViewRefImpl>.rootNodes has been tightened from List<dynamic> to List<Node> (where Node is from dart:html).
A combination of compile errors and warnings are produced when it seem that template, templateUrl, style, or styleUrls are either incorrect or missing when required.
The compiler now reports an actionable error when an annotation is used on a private class member. We also report errors when various annotations are used improperly (but not in all cases yet).
The compiler optimizes *ngIf usages where the content is pure HTML.
The view compiler is able to tell when exports: [ ... ] in an @Component are static reads and are immutable (such as String). This allows us to optimize the generated code.
Some changes to how template files import 'dart:core' to accommodate analyzer changes that make 'dynamic' a member of 'dart:core'. These should not have user-visible effects.

Application Bootstrap #

New features

The process for starting your AngularDart application changed significantly:
- For most applications, we now strongly recommend using the new runApp function. Instead of starting your application by passing the Type of an @Component-annotated class, you now pass a ComponentFactory, the generated code for a component:
```
import 'package:angular/angular.dart';

import 'main.template.dart' as ng;

void main() {
    runApp(ng.RootComponentNgFactory);
}

@Component(
    selector: 'root',
    template: 'Hello World',
)
class RootComponent {}
```
To provide top-level services, use the createInjector parameter, and pass a generated InjectorFactory for a top-level annotated with @GenerateInjector:
```
import 'package:angular/angular.dart';

import 'main.template.dart' as ng;

void main() {
  runApp(ng.RootComponentNgFactory, createInjector: rootInjector);
}

class HelloService {
  void sayHello() => print('Hello!');
}

@GenerateInjector([
   ClassProvider(HelloService),
])
final InjectorFactory rootInjector = ng.rootInjector$Injector;
```
A major difference between runApp and previous bootstrapping code is the lack of the initReflector() method or call, which is no longer needed. That means using runApp disables the use of SlowComponentLoader and ReflectiveInjector, two APIs that require this extra runtime metadata.

To enable use of these classes for migration purposes, use runAppLegacy:
```
import 'package:angular/angular.dart';

// ignore: uri_has_not_been_generated
import 'main.template.dart' as ng;

void main() {
  runAppLegacy(
    RootComponent,
    createInjectorFromProviders: [
      ClassProvider(HelloService),
    ],
    initReflector: ng.initReflector,
  );
}
```
NOTE: initReflector and runAppLegacy disables tree-shaking on any class annotated with @Component or @Injectable. We strongly recommend migrating to the runApp pattern.

Breaking changes

The top-level function bootstrap was deleted. This function always threw a runtime exception since 5.0.0-alpha+5, and was a relic of when a code transformer rewrote it automatically as bootstrapStatic.
Dropped support for @AngularEntrypoint and rewriting entrypoints to automatically use initReflector() and bootstrapStatic. This is no longer supported in the new build system.
RenderComponentType is no longer part of the public API.
<ApplicationRef> .componentFactories, .componentTypes, .zone, and .registerBootstrapListener were removed; these were used internally by the legacy router and not intended to be part of the public API.
PLATFORM_INITIALIZERS was removed.
APP_INITIALIZER was removed. A similar functionality can be accomplished using the runAppAsync or runAppLegacyAsync functions with the beforeComponentCreated callback.
PlatformRef and PlatformRefImpl were removed.

Misc #

Breaking changes

<NgZone>.onStable has been renamed to onTurnDone.
<NgZone>.onUnstable has been renamed to onTurnStart.
The context parameter was removed from <TemplateRef>.createEmbeddedView.
The following relatively unused fields and functions were removed:
- APPLICATION_COMMON_PROVIDERS
- BROWSER_APP_COMMON_PROVIDERS
- BROWSER_APP_PROVIDERS
- PACKAGE_ROOT_URL
- ErrorHandlingFn
- UrlResolver
- WrappedTimer
- WrappedValue
- ZeroArgFunction
- appIdRandomProviderFactory
- coreBootstrap
- coreLoadAndBootstrap
- createNgZone
- createPlatform
- disposePlatform
- getPlatform
Running within the NgZone will no longer cause addtional turns to occur within it's parent's zone. <NgZone>.run() will now run inside the parent zone's run() function as opposed to the other way around.
The compilation mode --debug (sparingly used externally) is now no longer supported. Some flags and code paths in the compiler still check/support it but it will be removed entirely by the final release and should no longer be used. We will rely on assertion-based tree-shaking (from Dart2JS) going forward to emit debug-only conditional code.

Bug fixes

We longer invoke <ExceptionHandler>.call with a null exception.

Other improvements

Misspelled or otherwise erroneous annotations on classes now produce a more understandable error message, including the element that was annotated and the annotation that was not resolved.

4.0.0 #

We are now named package:angular instead of package:angular2. As such you cannot pub upgrade from angular2 3.x -> angular2 4.x, and you need to manually update your dependencies instead:

dependencies:
  angular: ^4.0.0

AngularDart will start tracking the upcoming Dart 2.0 alpha SDK, and as such, 4.0.0 will be the last stable release that fully supports Dart 1.24.0. We may release small patches if needed, but otherwise the plan is to release 4.0.0 and then immediately start working on 5.0.0-alpha, which uses the new Dart SDK.

Breaking changes #

@Pipe-annotated classes are no longer considered @Injectable, in that they aren't usable within a ReflectiveInjector. You can get this behavior back by adding the @Injectable() annotation to the @Pipe-annotated class. Similar changes are in progress for @Component and @Directive.
PLATFORM_{PIPES|DIRECTIVES|PROVIDERS}, which was only supported in an older version of the compiler, was removed. All of these must be manually included in lists in an @Directive or @Component annotation.
Removed formDirectives from COMMON_DIRECTIVES list; replace COMMON_DIRECTIVES with [CORE_DIRECTIVES, formDirectives] for components that use forms directives.
Forms API has been moved to a new package, angular_forms, which is going to be versioned and maintained alongside the core framework. This should allow better segmentation of code and easier contributions.
The router package is now being published separate as package:angular_router (not through package:angular/router.dart). In the near future it will be updated to a more Dart idiomatic "2.0" router, but for now it is an exact replica of the previous router.
Removed @{Component|Directive}#queries. This is replable using the same member-level annotation (i.e. @{Content|View}Child{ren}).
DynamicComponentLoader was renamed SlowComponentLoader to encourage users to prefer ComponentLoader. Additionally, arguments projectableNodes: and onDestroy: callbacks were removed - they were mostly unused, and confusing since they were undocumented.
Removed angular/platform/browser_static.dart; replace imports with angular/angular.dart.
Removed angular/platform/common_dom.dart; replace imports with angular/angular.dart.
Removed angular/testing.dart; Use angular_test package instead.
Removed angular/platform/testing.dart.
Removed platform/testing/browser_static.dart.
Removed MockNgZone.
Removed ViewEncapsulation.native, which is no longer supported.
Renamed FORM_DIRECTIVES to formDirectives.
Removed angular/common.dart; replace imports with angular/angular.dart.
Removed angular/compiler.dart; compiler should only be invoked via the transformers or via pkg:build directly using angular/source_gen.dart.
Deprecated @View() annotation was completely removed.
Deprecated second parameter to ExceptionHandler was completely removed.
Removed the runtime (dart:mirrors-based) interpreter. It is now required to always use the AngularDart transformer to pre-compile the code, even during development time in Dartium. package:angular2/reflection.dart was also removed.
The bootstrap function now always throws a runtime exception, and both it and bootstrapStatic are accessible via angular.dart instead of platform/browser.dart and platform/browser_static.dart #357.
Returning false from an event handler will no longer cancel the event. See #387 for details.
Removed Query and ViewQuery. Please use ContentChild/ContentChildren and ViewChild/ViewChildren in their place instead.
Removed the use_analyzer flag for the transformer. This is always true. #404.
Removed all other unused or unsupported flags from the transformer. There is now a single CompilerFlags class that is universally supported for all build systems.
Removed a number of classes that were never intended to be public.
Removed the second parameter to ExceptionHandler, which was a no-op anyway.
Removed outputs field from Directive. Outputs now must be declared using inline Output annotations.

New features #

Added support for functional directives: lightweight, stateless directives that apply a one-time transformation.
- One is defined by annotating a public, top-level function with @Directive().
- The function parameters specify its dependencies, similar to the constructor of a regular directive.
- Only the selector and providers parameters of the @Directive() annotation are permitted, because the other parameters are stateful.
- The function return type must be void.

@Directive(selector: '[autoId]')
void autoIdDirective(Element element, IdGenerator generator) {
  element.id = generator.next();
}

Added visibility property to Directive. Directives and components that don't need to be injected can set visibility: Visibility.none in their annotation. This prevents the compiler from generating code necessary to support injection, making the directive or component non-injectable and reducing the size of your application.

// This component can't be injected by other directives or components.
@Component(selector: 'my-component', visibility: Visibility.none)
class MyComponent { ... }

Added ComponentLoader, a high-level imperative API for creating components at runtime. It uses internal code-paths that already existed, and is much more future proof. ComponentLoader is usable within a @Directive(), an @Component(), and injectable services.

// An `ExampleComponent`s generated code, including a `ComponentFactory`.
import 'example.template.dart' as ng;

class AdBannerComponent implements AfterViewInit {
  final ComponentLoader _loader;

  AdBannerComponent(this._loader);

  @override
  ngAfterViewInit() {
    final component = _loader.loadDetached(ng.ExampleComponentNgFactory);
    // Do something with this reference.
  }
}

You can now directly inject dart:html's Element or HtmlElement instead of ElementRef, which is "soft deprecated" (will be deprecated and removed in a future release).
findContainer has now been exposed from NgForm allowing easier creation of custom form implementations.
setUpControl has been exposed from the forms API to allow forms to setup their controls easier.
Inheritance for both component and directive metadata is now complete! Any field or method-level annotations (@Input, @Output, @ViewChild|Children, @ContentChild|Children) are now inherited through super types (extends, implements, with) #231:

class BaseComponent {
  @Input()
  String name;
}

// Also has an input called "name" now!
@Component(selector: 'comp')
class ConcreteComponent extends BaseComponent {}

Inputs that are of type bool now receive a default value of true instead of a value of null or an empty string. This allows a much more HTML-friendly syntax for your components:

<!-- All of these set a value of disabled=true -->
<fancy-button disabled></fancy-button>
<fancy-button [disabled]></fancy-button>
<fancy-button [disabled]="true"></fancy-button>

<!-- Value of disabled=false -->
<fancy-button [disabled]="false"></fancy-button>

@Component()
class FancyButton {
  @Input()
  bool disabled = false;
}

Added exports: [ ... ] to @Component, which allows the limited use of top-level fields and static methods/fields in a template without making an alias getter in your class. Implements #374.

import 'dart:math' show max;

@Component(
  selector: 'comp',
  exports: const [
    max,
  ],
  // Should write '20'
  template: '{{max(20, 10)}}',
)
class Comp {}

Limitations:
- Only top-level fields that are const (not final) can be exported.
Added @deferred as the first "compile-time" directive (it has no specific runtime code nor is it listed in a directives: [ ... ] list. Implements #406.

import 'package:angular2/angular2.dart';
import 'expensive_comp.dart' show ExpensiveComp;

@Component(
  selector: 'my-comp',
  directives: const [ExpensiveComp],
  template: r'''
    <expensive-comp @deferred></expensive-comp>
  ''',
)
class MyComp {}

Added preliminary support for component inheritance. Components now inherit inputs, outputs, host bindings, host listeners, queries, and view queries from all supertypes.
We use a new open sourcing tool called "CopyBara" that greatly simplifies both releasing and taking open source contributions. We are able to release to github more often, and accept PRs much more easily. You can view our bleeding github-sync branch for what has yet to be merged into master.
We no longer emit ng_*.json files as part of the compile process #276.
Attribute selectors (<ng-content select="custom-action[group='1']">) is now supported #237.
Lifecycle interfaces no longer need to be "re-implemented" on classes in order for the compiler to pick them up - we now respect the dependency chain #19.
Provider(useValue: ...) now accepts "complex const data structures", with the caveat that your data structure must not be invoking a private constructor #10.

Deprecations #

Support for shadow piercing combinators /deep/ and >>> to prevent style encapsulation is now deprecated. /deep/ is already deprecated and will be removed in Chrome 60. Its alias >>> is limited to the static profile of selectors, meaning it's not supported in style sheets. Continued use of these combinators puts Angular at risk of incompatibility with common CSS tooling. ::ng-deep is a drop-in replacement, intended to provide the same functionality as /deep/ and >>>, without the need to use deprecated or unsupported CSS syntax #454.

Bug fixes #

Compiler now warns when annotations are added to private classes or functions.
Compiler now warns when injecting into a field that is non-existent.
Fixed a long-standing bug on ngSwitch behavior in Dartium.
Fixed a bug in @deferred when nested views has DI bindings. Fixes #578.
The transformer now fails if any unsupported arguments are passed in.
Fixed a bug where @deferred did not work nested inside of <template>:

<template [ngIf]="someCondition">
  <expensive-comp @deferred></expensive-comp>
</template>

ngForm now allows onSubmit to be called with a null value.
Using inputs|outputs in the @Component annotation to rename an existing @Input() or @Output() now logs and fails the build during compilation.
Symbol collisions with dart:html no longer cause a runtime exception, all framework use of dart:html is now scoped behind a prefixed import.
Properly annotate methods in generated .template.dart code with @override.
Updated the documentation for OnInit and OnDestroy to mention more specifics about the contract and document "crash detection" cases where they may be called more than once.
*ngIf now properly checks that inputs do not change during change detection #453.
Properly typed TrackByFn as an int not a num #431.
Import aliases are supported by the compiler #245.

Performance #

Various small reductions to the size of generated code and the runtime.
Directives now generate their own change detector class (behind the scenes) instead of the code being re-created into every component that uses a directive.
Remove redundant calls to dbg(...) in dev-mode. This reduces the amount of work done and speeds up developer runtimes, such as those using the DartDevCompiler (DDC).
Some change detection code that was duplicated across all generated templates were moved internally to a new AppView#detectHostChanges method.
Introduced a new AppViewData structure in the generated code that decreases code size ~2% or more in some applications due to better code re-use and emit in dart2js.
We no longer change detect literals and simple final property reads.
Some of the enums used to manage change detection state have been simplified to int in order to reduce the cost in the generated code.

3.1.0 #

New features #

Exposed TouchFunction and ChangeFunction typedefs to make the transition to strong-mode easier for teams relying on these function definitions. We might remove them in a future release when they are no longer needed.
Added a flag to use an experimental new compiler that uses the Dart analyzer to gather metadata information. This flag will be turned on by default in 4.0:

transformers:
    angular2/transform/codegen:
        use_analyzer: true

WARNING: Using use_analyzer: true requires discontinuing use of the platform_* options, and fails-fast if both flags are used. See https://goo.gl/68VhMa for details.

WARNING: Using use_analyser: true doesn't yet work with most third-party packages due to a bug.

Deprecations #

Using dart:mirrors (i.e. running AngularDart without code generation) is now formally deprecated. In 4.0+ code generation will be the only way to run an AngularDart application, even in development mode. Please ensure you are using our transformer: https://goo.gl/rRHqO7.

Bug fixes #

CSS errors are now just warnings, and can be ignored. This is due to using a CSS parser for encapsulation - and the AngularDart transformer aggressively runs on all CSS files in a given package. We hope to make this smoother in a future release.
Do not generate throwOnChanges checks outside of dev-mode.

Performance #

Bypasses the deprecated event plugin system for all native DOM events.
At runtime interpolate is now represented by multiple functions (faster).
KeyValueDiffer (NgClass, NgStyle) optimized for initial add/removals.
No longer generates event handler registrations for directive outputs.

3.0.0 #

New features #

composeValidators and composeAsyncValidators now part of the public API.
angular2/testing.dart includes a test-only isDebugMode function.
(Forms) AbstractControl.markAsDirty now emits a status change event.

Breaking changes #

Requires at least Dart SDK 1.23.0.
Injecting null is no longer supported.
Remove unused useProperty argument in DI Provider api.
ReflectionCapabilities.isReflectionEnabled renamed to reflectionEnabled.
Malformed CSS warnings are errors now.

Removed forms async validators. Alternative:

control.valueChange((value) {
  rpc.validate(change).then((errors) {
    if (errors != null) control.setErrors(errors);
  });
});

Removed TitleService. To update the title, use dart:html:
```
document.title = 'My title';
```
DynamicComponentLoader now has a simplified API:

loadAsRoot, loadAsRootIntoNode replaced by a single load method that always creates the component root node instead of hoisting into an existing node.
Removed viewBindings from Component. This has been interchangeable with viewProviders for a while now.

BEFORE: dart @Component(viewBindings: const [])

AFTER: dart @Component(viewProviders: const [])
Removed EventManager from the public API. Code generation is now closer to document.addEventListener and having this interception layer would not allow further optimizations.
Removed IterableDifferFactory and KeyValueDifferFactory from the public API. We have planned compiler optimizations that will no longer allow overriding our diffing implementations. Looking into alternatives before a final 3.0.0 release that are lower cost.
ASYNC_VALIDATORS can no longer return a Stream instance, only Future.
The experimental NgTestBed was removed. Use package:angular_test now.
By default, the ExceptionHandler is a BrowserExceptionHandler, which prints exceptions to the console. If you don't want this behavior (i.e. releasing to production), make sure to override it.
ElementRef.nativeElement is now final (no setter).
DOM adapter is now completely removed from the API and generated code
A name parameter is now required for all @Pipe(...) definitions:

BEFORE: dart @Pipe(name: 'uppercase')

AFTER: dart @Pipe('uppercase')
DomEventsPlugin now requires a strongly typed interface to dart:html.

Null is no longer propagated as an initial change value. Code should be updated to either deliver a different initial value or components with an @Input() should have an appropriate default value.

BEFORE

<my-component [value]="null"></my-component>
...
String _value;

set value(String value) {
  _value = value ?? 'Default name';
}

AFTER

String _value = 'Default name';

set value(String value) { _value = value; }

Removed the isFirstChange() method of SimpleChange. Instead, check whether previousValue is null.
Removed NgPlural, deprecated as of 2.1.0.
Removed ObservableListDiffFactory, deprecated as of 2.1.0.

Event handlers are bound at initialization time. Therefore, the following will no longer work, because clickHandler is null during initialization.

@Component(
    selector: 'my-component',
    template: '<div (click)="clickHandler($event)"></div>')
class MyComponent {
  Function clickHandler;
}

Removed Component.moduleId, which was unused.

Deprecations #

@View will be removed in 4.0, only use @Component instead.
EventEmitter is now @Deprecated: Use Stream and StreamController.
ngSwitchCase replaces ngSwitchWhen (soft deprecation).
XHR is deprecated, along with the runtime/reflective compiler.
IterableDiffers and KeyValueDiffers are deprecated. The cost of looking up to see if a custom differ is available is too high for almost no use. Before they're removed, we'll have other customization options.

Bug fixes #

Updated various documentation to make cleaner and use Dart, not TS, samples.
Perf: Added performance improvements around generated code and type inference.
Fix: Key-value differ now detects removals when first key moves.
Fix: <ng-content select="..."> does not emit incorrect code (regression).
Perf: Optimized how reflective providers are resolved on application startup.
ngSwitchWhen now properly compares identity in Dartium.
Component/Directive#selector is now a @required property.
Angular warns in the console if using Dartium without checked mode.
Various performance improvements for both code size and runtime.
Various Dart idiomatic/style guide updates to the codebase.
ngIf now throws again if the bound value changes during change detection.
Fixed a bug where the router didn't work on a root path in IE11.
Fixed generated code that caused a strong-mode warning on AppView<...>.
Fixed a bug where DDC didn't work properly with "pure" Pipes.
Some simple types are now propagated to the generated .template.dart file.
When setting up a new NgControl, valueAccessor no longer can throw an NPE
Re-enabled strong-mode analysis within the project, and fixed some errors.

Refactoring #

We now use the formal <T> generic type syntax for methods, not /*<T>*/.
Removed NgZoneImpl, all the code exists in NgZone now.
We now generate specific code for view and content children (faster).
Projectable nodes now use the visitor pattern in AppView.
In generated .template.dart change detected primitives are typed.
Moved renderType as a static class member in generated code.

2.2.0 #

API changes #

Breaking changes
- Using @ViewQuery|Children|Content| in a constructor is no longer valid. This caused significant extra code to need to be generated for a case that is relatively rare. Code can safely be moved into a setter in most cases.

BEFORE ```dart class MyComponent { QueryList

MyComponent(@ContentChildren(ChildComponent) this._childComponents); } ```

AFTER ```dart class MyComponent { QueryList

@ContentChildren(ChildComponent) set childComponents(QueryList

Bug fixes #

Importing angular2/reflection.dart now works properly.

2.1.1 #

API changes #

Introduced angular2/reflection.dart as canonical way to opt-in to mirrors. In 2.2.0 it will be considered deprecated to enable runtime reflection by any other means.

2.1.0 #

API changes #

Breaking changes
- NgControlStatus no longer included in COMMON_DIRECTIVES and in FORM_DIRECTIVES. Needs to be manually included in your bootstrap or migrated off of
Deprecations
- Using @Query in a component constructor; move to field-level
- Renderer: Use dart:html directly
- NgControlStatus: A form control should set class they are interested in
- NgPlural: Was never formally supported in Angular Dart. Recommend using package:intl with getters on your @Component pointing to an Intl.message call until we have formal template support (planned)
- ObservableListDiff: Not properly implemented, will re-introduce later
Removed support for InjectorModule - was never formally supported

Bug fixes and other changes #

Documentation fixes and cleanups across the codebase
Code size and runtime performance improvements across the codebase
More reduction of STRONG_MODE exceptions in the compiler
Removed InjectorModule code (from TS-transpiler era)
Fixed a bug with ExceptionHandler not being called during change detection
Fixed a bug where controls were not marked dirty when an error was set

2.0.0 Release #

API changes #

Implemented NgTestBed to improve test infrastructure goo.gl/NAXXlN.
Removed Metadata classes used for angular annotations.
Added ComponentState to provide push change detection with better ergonomics and code generation.
ViewContainerRef.createEmbeddedView index parameter removed instead introduced insertEmbeddedView.
Added support for minimal code generation when user explicitly marks component with preserveWhitespace:false.

Bug fixes and other changes #

Improved ngFor performance.
Improved shared style host performance.
Improved @ViewChild/@ViewChildren performance.
Code and documentation cleanups.
Strong mode fixes.

2.0.0-beta.22 #

API changes #

POTENTIALLY BREAKING Observable features new use the new observable package, instead of observe.
Removed Renderer.createViewRoot.

Bug fixes and other changes #

Improved compiler errors.
Fixes to reduce code size.
Support the latest pkg/build.
Now require Dart SDK 1.19 at a minimum.
Added .analysis_options to enforce a number of style rules.

2.0.0-beta.21 #

Our push towards better performance has started showing results in this release. This update provides 5-10% speedup in components. >20% reduction in Dart code size emitted from compiler.

API changes #

Added support for '??' operator in template compiler.
Removed unused animation directives to create more Darty/compile time version.
Removed unused i18n pipes to prepare for dart:intl based solution.
Language facades removed (isPresent, isBlank, getMapKey, normalizeBool, DateWrapper, RegExpWrapper, StringWrapper, NumberWrapper, Math facades, SetWrapper, ListWrapper, MapWrapper, StringMapWrapper, ObservableWrapper, TimerWrapper).
Deprecated unused ROUTER_LINK_DSL_TRANSFORM.
Refactor(element.dart) is now app_element.dart.
AppView moved to app_view. DebugAppView moved to debug/debug_app_view.dart.
The deprecated injection Binding and bind have been removed.
Remove global events and disposables (instead of :window type targets, use dart APIs).

Bug fixes and other changes #

Improved change detection performance.
Improved error messages reported by template compiler.
Optimized [class.x]="y" type bindings.
Switched to js_util for browser_adapter to make angular CSP compliant.
Started strongly typing element members in compiled template code.
Cheatsheet and code docs updated.
Router fixes

2.0.0-beta.20 #

API changes #

Added ngBeforeSubmit event to ngForm API to allow better validation.
Global events removed from event binding syntax (dart:html APIs provide better alternative).

Bug fixes and other changes #

Reduced template code size.
Cleanup of facades.
Class Documentation updates.
ngForm submit changed to sync.
Removed disposables in generated template code.

2.0.0-beta.19 #

API changes #

Remove existing implementation of web workers, to be replaced in the future with Dart import override for dart:html.

Bug fixes and other changes #

Remove throwOnChanges parameter from all change detection calls in generated template.dart.
Unused and empty assertArrayOfStrings API removed.
Update BrowserDomAdapter from dart:js to package:js.
Reset change detection to guard against template exception.
Delete unused files.
Clean up the NgIf directive and remove facades.
Enabled Travis-CI.
Update tests that should only run in the browser.
Add angular transformer which deletes any pre-existing generated files from Bazel.
Add DI library entrypoint to support VM tests.
Fix the Math facade (improper annotation): @Deprecated(description).
Clean up animation classes.
Remove library name declarations.
Run dart formatter on all code.
Remove unused testing/lang_utils.dart.

2.0.0-beta.18 #

This is the first release of Angular 2 for Dart that is written directly in Dart, instead of generated from TypeScript.

API changes #

The Provider constructor and provide() function are now more intuitive when they have a single argument.

Before, const Provider(Foo) or provide(Foo) would provide a null object. To provide a Foo object, you had to use const Provider(Foo, useClass:Foo) or provide(Foo, useClass:Foo). Now you can omit the useClass:Foo. Either of the following provides a Foo instance:

const Provider(Foo)
// or
provide(Foo)

If you want the old behavior, change your code to specify useValue:

const Provider(Foo, useValue: null)
// or
provide(Foo, useValue: null)

Known issues #

Some types of dependency injection don't work. (https://github.com/dart-lang/angular2/issues/10)

Bug fixes and other changes #

Fix lower bound of pkg/build dependency.
Fixes for dependency upper bounds: build and protobuf.
Bumping min version of pkg/intl and pkg version.
Remove redundant declaration of el.
Security Update. Secure Contextual Escaping Implementation.
Fix Intl number formatting.
Enforce strong mode for angular2.dart.
Updating README and CONTRIBUTING.md for first release.
Enforce dartfmt for dart/angular2.
Add //dart/angular2/build_defs with default resolved_identifiers.
Import cleanup.
Annotate browser-only tests.
Include .gitignore in files sent to GitHub.
Fix a strong mode error in angular2 (strong mode type inference miss).
Add compiler tests.
Delete unused libraries in lib/src.
Updated pubspec: authors, description, homepage.
Angular strong mode fixes for DDC support.
Add _LoggerConsole implementation of Console for the TemplateCompiler.
Mark Binding and bind() as deprecated. Replaced by Provider and provide().

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