19.0.0 (2024-11-19)

Breaking Changes

compiler

this.foo property reads no longer refer to template context variables. If you intended to read the template variable, do not use this..

core

Angular directives, components and pipes are now standalone by default.
- Specify standalone: false for declarations that are currently declared in @NgModules.
- ng update for v19 will take care of this automatically.
TypeScript versions less than 5.5 are no longer supported.
Timing changes for effect API (in developer preview):
- effects which are triggered outside of change detection run as part of
  the change detection process instead of as a microtask. Depending on the
  specifics of application/test setup, this can result in them executing
  earlier or later (or requiring additional test steps to trigger; see below
  examples).
- effects which are triggered during change detection (e.g. by input
  signals) run earlier, before the component's template.
ExperimentalPendingTasks has been renamed to PendingTasks.
The autoDetect feature of ComponentFixture will now
attach the fixture to the ApplicationRef. As a result, errors during
automatic change detection of the fixture be reported to the ErrorHandler.
This change may cause custom error handlers to observe new failures that were previously unreported.

createComponent will now render default fallback with empty projectableNodes.

When passing an empty array to projectableNodes in the createComponent API, the default fallback content
of the ng-content will be rendered if present. To prevent rendering the default content, pass document.createTextNode('') as a projectableNode.

// The first ng-content will render the default fallback content if present
createComponent(MyComponent. { projectableNodes: [[], [secondNode]] });

// To prevent projecting the default fallback content:
createComponent(MyComponent. { projectableNodes: [[document.createTextNode('')], [secondNode]] });

Errors that are thrown during ApplicationRef.tick
will now be rethrown when using TestBed. These errors should be
resolved by ensuring the test environment is set up correctly to
complete change detection successfully. There are two alternatives to
catch the errors:
- Instead of waiting for automatic change detection to happen, trigger
  it synchronously and expect the error. For example, a jasmine test
  could write expect(() => TestBed.inject(ApplicationRef).tick()).toThrow()
- TestBed will reject any outstanding ComponentFixture.whenStable promises. A jasmine test,
  for example, could write expectAsync(fixture.whenStable()).toBeRejected().
As a last resort, you can configure errors to not be rethrown by
setting rethrowApplicationErrors to false in TestBed.configureTestingModule.
The timers that are used for zone coalescing and hybrid
mode scheduling (which schedules an application state synchronization
when changes happen outside the Angular zone) will now run in the zone
above Angular rather than the root zone. This will mostly affect tests
which use fakeAsync: these timers will now be visible to fakeAsync
and can be affected by tick or flush.
The deprecated factories property in KeyValueDiffers has been removed.

elements

as part of switching away from custom CD behavior to the
hybrid scheduler, timing of change detection around custom elements has
changed subtly. These changes make elements more efficient, but can cause
tests which encoded assumptions about how or when elements would be checked
to require updating.

localize

The name option in the ng add @localize`` schematic has been removed in favor of the project option.

platform-browser

The deprecated BrowserModule.withServerTransition method has been removed. Please use the APP_ID DI token to set the application id instead.

router

The Router.errorHandler property has been removed.
Adding an error handler should be configured in either
withNavigationErrorHandler with provideRouter or the errorHandler
property in the extra options of RouterModule.forRoot. In addition,
the error handler cannot be used to change the return value of the
router navigation promise or prevent it from rejecting. Instead, if you
want to prevent the promise from rejecting, use resolveNavigationPromiseOnError.
The return type of the Resolve interface now includes
RedirectCommand.

common

Commit	Description
	add optional rounded transform support in cloudinary image loader (#55364)
	automatically use sizes auto in NgOptimizedImage (#57479)
	disable keyvalue sorting using null compareFn (#57487)

compiler

Commit	Description
	add diagnostic for unused standalone imports (#57605)
	add support for the `typeof` keyword in template expressions. (#58183)
	`this.a` should always refer to class property `a` (#55183)
	add more specific matcher for hydrate never block (#58360)
	avoid having to duplicate core environment (#58444)
	control flow nodes with root at the end projected incorrectly (#58607)
	fix `:host` parsing in pseudo-selectors (#58681)
	fix multiline selectors (#58681)
	handle typeof expressions in serializer (#58217)
	ignore placeholder-only i18n messages (#58154)
	resolve `:host:host-context(.foo)` (#58681)
	transform chained pseudo-selectors (#58681)

compiler-cli

Commit	Description
	'strictStandalone' flag enforces standalone (#57935)
	ensure template style elements are preprocessed as inline styles (#57429)
	generate the HMR replacement module (#58205)
	disable standalone by default on older versions of Angular (#58405)
	do not fail fatal when references to non-existent module are discovered (#58515)
	do not report unused declarations coming from an imported array (#57940)
	incorrectly generating relative file paths on case-insensitive platforms (#58150)
	make the unused imports diagnostic easier to read (#58468)
	report individual diagnostics for unused imports (#58589)
	reduce duplicate component style resolution (#57502)

core

Commit	Description
	Add a schematics to migrate to `standalone: false`. (#57643)
	Add async `run` method on `ExperimentalPendingTasks` (#56546)
	Add incremental hydration public api (#58249)
	Add rxjs operator prevent app stability until an event (#56533)
	add syntactic sugar for initializers (#53152)
	allow passing `undefined` without needing to include it in the type argument of `input` (#57621)
	allow running output migration on a subset of paths (#58299)
	change effect() execution timing & no-op `allowSignalWrites` (#57874)
	drop support for TypeScript 5.4 (#57577)
	experimental `resource()` API for async dependencies (#58255)
	experimental impl of `rxResource()` (#58255)
	flipping the default value for `standalone` to `true` (#58169)
	initial version of the output migration (#57604)
	introduce `afterRenderEffect` (#57549)
	introduce debugName optional arg to framework signal functions (#57073)
	introduce the reactive linkedSignal (#58189)
	mark input, output and model APIs as stable (#57804)
	mark signal-based query APIs as stable (#57921)
	migrate ExperimentalPendingTasks to PendingTasks (#57533)
	promote `outputFromObservable` & `outputToObservable` to stable. (#58214)
	Promote `takeUntilDestroyed` to stable. (#58200)
	stabilize `@let` syntax (#57813)
	support TypeScript 5.6 (#57424)
	treat directives, pipes, components as by default (#58229)
	allow signal write error (#57973)
	avoid breaking change with apps using rxjs 6.x (#58341)
	clean up event contract once hydration is done (#58174)
	ComponentFixture autoDetect feature works like production (#55228)
	Ensure the `ViewContext` is retained after closure minification (#57903)
	fallback to default ng-content with empty projectable nodes. (#57480)
	Fix fixture.detectChanges with autoDetect disabled and zoneless (#57416)
	fixes issues with control flow and incremental hydration (#58644)
	prevent errors on contract cleanup (#58614)
	Prevents trying to trigger incremental hydration on CSR (#58366)
	Re-assign error codes to be within core bounds (<1000) (#53455)
	resolve forward-referenced host directives during directive matching (#58492)
	rethrow errors during ApplicationRef.tick in TestBed (#57200)
	Schedulers run in zone above Angular rather than root (#57553)
	set encapsulation to `None` for empty component styles (#57130)
	remove deprecated `factories` Property in `KeyValueDiffers` (#58064)

elements

Commit	Description
	support `output()`-shaped outputs (#57535)
	switch to `ComponentRef.setInput` & remove custom scheduler (#56728)

forms

Commit	Description
	add ability to clear a FormRecord (#50750)
	fix FormRecord type inference (#50750)

http

Commit	Description
	promote `withRequestsMadeViaParent` to stable. (#58221)
	preserve all headers from Headers object (#57802)

language-service

Commit	Description
	add code fix for unused standalone imports (#57605)
	add code reactoring action to migrate `@Input` to signal-input (#57214)
	allow code refactorings to compute edits asynchronously (#57214)
	support converting to signal queries in VSCode extension (#58106)
	support migrating full classes to signal inputs in VSCode (#57975)
	support migrating full classes to signal queries (#58263)
	The suppress diagnostics option should work for external templates (#57873)

localize

Commit	Description
	remove deprecated `name` option. (#58063)

migrations

Commit	Description
	add a combined migration for all signals APIs (#58259)
	add schematic to migrate to signal queries (#58032)
	capture output migration stats (#58321)
	expose output as function migration (#58299)
	introduce signal input migration as `ng generate` schematic (#57805)
	migrate .pipe calls in outputs used in tests (#57691)
	print output migration stats in ng generate (#58321)
	remove complete calls for migrated outputs (#57671)
	replace .next usage on outputs (#57654)
	add outputs migration to combined shorthand (#58318)
	change imports to be G3 compatible (#57654)
	do not migrate next calls in template if not an EventEmitter (#58631)
	flip the default standalone flag in route-lazy-loading migration (#58474)
	include the output migration in the defaults of the signal migration (#58635)
	inject migration always inserting generated variables before super call (#58393)
	inject migration not inserting generated code after super call in some cases (#58393)
	migrate more .next output usages (#58282)
	properly bundle shared compiler code into migrations (#58515)
	properly handle comments in output migration (#57691)
	properly migrate output aliases (#58411)
	properly replace imports across files (#58414)
	properly resolve tsconfig paths on windows (#58137)
	replace removed NgModules in tests with their exports (#58627)

platform-browser

Commit	Description
	correctly add external stylesheets to ShadowDOM components (#58482)
	remove deprecated `BrowserModule.withServerTransition` method (#58062)

platform-server

Commit	Description
	destroy `PlatformRef` when error happens during the `bootstrap()` phase (#58112)

router

Commit	Description
	Add `routerOutletData` input to `RouterOutlet` directive (#57051)
	Align RouterModule.forRoot errorHandler with provider error handler (#57050)
	remove setter for `injector` on `OutletContext` (#58343)
	Update Resolve interface to include RedirectCommand like ResolveFn (#57309)