Angular 9.0.0 is finally released to the public. We've compiled the changes that were introduced from next.1 to Angular 9.0.0-rc.14.

Author: Lilia Fedorenko

Ladies and gentlemen, after a 3-month delay, the official version of Angular 9.0.0 is released to the public. (Who knows, perhaps this would also delay the release of the Angular 10.0.0 that was planned to be released in May 2020... We'll see.)

However, what does Angular 9.0.0 have? Let’s check out the highlights of the Next and Release Candidate versions.

In this article, we’ve compiled the changes that were introduced in versions of Angular 9.0.0-next.1 to Angular 9.0.0-RC.14, including bug fixes, breaking changes, reverts, deprecations, code refactoring, features, and performance improvements.

Angular website: angular.io

Angular changelog on GitHub: github.com/angular/changelog

Angular v9.0.0 (February 6, 2020)

The official release highlights and the CLI-powered automated update workflow are available on the official website in the angular v9 release announcement.

How to update to Angular v9:

Update your project to the latest version of Angular 8: ng update @angular/cli@8 @angular/core@8

Then update it to Angular v9: ng update @angular/cli @angular/core

Detailed update instructions can be found here: update.angular.io

Dependency updates

@angular/core now requires RxJS 6.5

@angular/compiler-cli now requires TypeScript 3.6 or 3.7

Angular 9.0.0-rc.14 (February 3, 2020)

Features

performance improvement for eventListeners

Bug Fixes

ivy: host-styling doesn't throw assert exception inside *ngFor

ngcc: cache correctly invalidated when moving/removing files/directories if the target is not compiled by Angular, ngcc isn't locked



Angular 9.0.0-rc.13 (February 1, 2020)

Features for ngcc:

now outdated ngcc artifacts are cleaned automatically

Bug Fixes

compiler-cli: sass is added as a valid CSS preprocessor extension subclass Promise without Symbol.species is allowed

common: http/testing expectOne lists the received requests if no matches extra & in http params is removed



Angular 9.0.0-rc.12 (January 30, 2020)

Features

ivy: static priority resolution is the same level as the directive it belongs to

language-service: completions for output $event properties as well as completions for $event variable added hover for the micro syntax in the structural directive



Performance Improvements for Ivy:

the unused argument in hostBindings function is removed

Bug Fixes

ivy: FatalDiagnosticError thrown from the pre-analysis phase is caught DebugNode/DebugElement are tree-shakeable in Ivy multi providers in ModuleWithProviders are not duplicated ViewContainerRef gets the correct parentInjector

language-service: duplicate returned definitions are pruned repeated symbol definitions for structural directive are removed added a warning instead of an error for missing context members the filename in code-frame error messages is re-enabled

ngcc: lockfile error message is improved



Angular 9.0.0-rc.11 (January 24, 2020)

Features

common: getLocaleCurrencyCode exposed publicly

compiler-cli: node 10 is required as runtime engine

language-service: specific suggestions for template context dialogs multiple symbol definitions supported

ngcc: ngcc is locked when processing



Performance Improvement for Ivy

more styling use-cases are added to benchmarks

Bug Fixes

ivy: component emitted correctly when it's removed from its module DebugNode.classes are working on SVG elements aliasing is disabled in template type-checking changes on detached child embedded views aren't detected eventListeners added outside angular context are not called type-check for multiple bindings to the same input type-check for properties which map to multiple fields any is used for generic context checks when !strictTemplates wrap 'as any' casts in parentheses when needed

language-service: diagnostic span points to the class name metadata in Declaration is non-optional getDiagnostics is renamed to getSemanticDiagnostics

ngcc: when analysis fails, the compilation isn't attempted private declarations aren't collected from external packages libraries using spread in object literals are processed ngcc is locked only after targeted entry-point check package.json updated deterministically



Angular 9.0.0-rc.10 (January 22, 2020)

The Angular 9.0.0-rc.10 version came out with a few bug fixes. Can the absence of new features or performance improvements mean that we're close to the official release?

Bug Fixes

'noImplicityAny' incompatibility that appeared due to ts3.7 update is fixed

when removing parent in Ivy, you no longer need to wait for child animations to finish

diffing in ngStyle/ngClass correctly emits value changes

LOCALE_ID is set after app initializers in Ivy

pipes in host bindings are detected more accurately

DTS deep imports aren't added to missing packages list in ngcc

Angular 9.0.0-rc.9 (January 15, 2020)

Features

common: default currency code is now configurable

ivy: ExpressionChangedAfterChecked error message for attributes is improved

language-service: template reference variables support completions

i18n locale data includes currency code

language-service completion for $event variable is added hover/definitions for the structural directive are now supported



Performance Improvements for Ivy

create scenario and noop change detection are added to the styling benchmark

static style is added to the list of scenarios

the performance of styling algorithm benchmark is improved

Bug Fixes

forms: number length is accepted in length validators disabled input acceptance member is now properly applied

ivy: view dirty state isn't reset in check no changes mode decorator handlers don't run against declaration files overloaded constructors are handled in ngtsc ngClass now applies classes with trailing/leading spaces errors are prevented during DebugElement roots query that were outside angular context components with attribute selectors are bootstrapped correctly warnings are showed instead of throwing for unknown elements

language-service: break the hover/definitions for two-way binding CRLF offset in inline template i18n parser isn't used for templates only directives are visited

ngcc: avoid error due to circular dependency in EsmDependencyHost correctly detect dependencies in CommonJS correctly handle inline exports in UMD don't crash if symbol has no declarations handle UMD factories that do not use all params insert definitions after statement recognize re-exports with require() calls in UMD recognize re-exports with imported TS helpers in CommonJS and UMD



Angular 9.0.0-rc.8 (January 8, 2020)

Features

compiler: records the end of expression token

language-service: symbol type to hover tooltip was added documentation is shown on hover



Performance Improvements

Ivy now supports simple generic type constraints in local type ctors

Bug Fixes

common: trailing whitespace for CurrencyPipe was removed

ivy: advance instructions before i18nExp are appended output bound events are correctly associated with directives ngProjectAs marker name appears now at even attribute index field inheritance is skipped if InheritDefinitionFeature is present on parent def TestBed now wraps imports array function when overriding provider

language-service: the bug with completions after "let x of |" in ngFor was fixed expressions in an attribute are parsed correctly The pipe method no longer includes parentheses

ngcc: entry-point dependencies are captured from typings as well as the source trailing commas are no longer added in UMD imports



Angular 9.0.0-rc.7 (December 18, 2019)

Features

forms: NgModel disabled type expanded to work with strict template type checking

ivy: An error shows now when inheriting a ctor from an undecorated base A compilation error shows when providing undecorated classes



Performance Improvements

compiler: cloning cursors state optimized i18n digest computations work faster now shared interpolation regex is used

ivy: export scopes extracted from declaration files are cached the template is parsed twice during the analysis prior analysis work is used during incremental builds instances of DomElementSchemaRegistry are shared module resolution cache is used



Bug Fixes

animations: when a parent has a leave transition, the leaking detached nodes are fixed

common: ngStyle ignores undefined values now

ivy: duplicate errors are avoided in safe navigations and template guards when reading metadata in JIT mode, proto isn't used template diagnostics aren't produced when the scope is invalid better error is generated for template var writes i18n - the translate function is removed when clearing translations i18n instructions are no longer thrown off by sanitizer in IE11 ExpressionChangedAfterChecked error is improved DebugNode.attributes on IE now has a consistent attribute casing correct injectable name is now logged in warning message on IE JIT mode inheritance is working correctly now on IE10 injectable definition inheritance from undecorated class is working correctly on IE10 in JIT mode correct absolute source span is recorded for ngForOf expressions provider type checks reordered to align with VE unknown property and element checks are now working correctly in IE NgModule declarations field now has validation

language-service: HTML path includes the last node before the cursor properties and events now have proper completions let and of in ngFor completions are removed

ngcc: aliased classes are matched correctly between src and dts files CommonJS re-exports are handled by reference imports in dts files are handled when processing UMD UMD re-exports now are handled and UMD imports are rendered even in the case of no prior imports correct identifiers are used when updating typings files



Angular 9.0.0-rc.6 (December 11, 2019)

Performance improvements for Ivy:

Chain listener and chain styling instructions are added

Bug Fixes

bazel: improved performance of tsHost.writeFile()

common: closure locales updated to include directionality data

compiler: localized strings are ES5 compatible for JIT mode modern diagnostic formatting

compiler-cli: declaration-only template type check members allowed

ivy: a flag added to skip non-exported classes TestBed.overrideProvider aligned with what happens with providers in TestBed providers array change detection is not invoked for destroyed views SafeStyles in [style.prop] is handled correctly static coercion members are inherited from base classes ternary expressions are properly parenthesized when emitted when DI can't inject a ctor param, the error is more correct

language-service: accessing a string index signature using dot notation bug is fixed getExternalFiles() is removed js primitive type name is returned resolution logic in the banner is simplified

ngcc: bundle rootDir is the package path undecorated child migration is fixed when exportAs is present Angular error codes are logged correctly diagnostics from migrations are reported



Angular 9.0.0-rc.5 (December 4, 2019)

Performance Improvements

js-web-frameworks benchmark was added

duplicate state lookup and default function parameters are now avoided in Ivy

Bug Fixes

bazel: @angular/core is no longer relied on as a dependency for @angular/bazel installation template type checking in ng_module was reenabled

common: the input type is reflected in NgForOf and NgIf contexts

compiler: whitespace trimmed from i18n custom ids

compiler-cli & core: ngI18nClosureMode is guarded in generated code

ivy: insertion of views attached to a different container is now allowed -1 consistently returned from ViewContainerRef.indexOf for non-inserted view ngProjectAs templates correctly supported XLIFF placeholders parsed correctly HTML foreign objects inside SVG are correctly validated ICUs are supported with pipes

language-service: the correct type for ngFor exported values is determined if the metadata for NgModule is not found, the diagnostics are not produced Symbol.specics of Promise implemented parentheses are inserted for method completion missing modules are suggested instead of an error message host.errror() is used instead of console.error()

ngcc: legacy i18n message IDs are rendered by default



Angular 9.0.0-rc.4 (November 27, 2019)

Features for language service:

completions support indexed types and tuple (immutable) arrays

Performance improvements for Ivy:

if a viewRef is moved to the same position, no work is done

time micro-benchmarks creation bug is fixed

NgModuleDefs that were already processed aren't processed again (R3TestBed)

Angular 9.0.0-rc.3 (November 20, 2019)

Features

bazel: now you can use bazel v1.1.0 thanks to updated ng-add

core: missing-injectable migration should migrate empty object literal providers



Performance Improvements

ivy: has an added micro-benchmark focused on directive input update no longer stores public input names in two places extracts template's instruction first create pass processing improves the performance of transplanted views



Bug Fixes

bazel: added terser as an optional peer dependency

compiler-cli: getTsTypeFromBuiltinType was refactored

core: QueryList implements Iterable in the type system

ivy: the program is not constantly reanalyzed during incremental rebuilds cyclical dependency on imports is avoided constant object literals aren't shared across element and component instances ivy no longer infers the template context types in full mode fs-relative paths aren't emitted when rootDir(s) aren't in effect added an ExpressionChangedAfterItHasBeenCheckedError for SafeValue the assertion extended in directiveInject function to support IcuContainers i18n - ensures that colons in i18n metadata are not rendered i18n - supports "", "`" and "${" sequences in i18n messages moves setClassMetadata calls into a pure life properly inserts views before ng-container with injected ViewContainerRef properly inserts views into ViewContainerRef injected by querying watch mode diagnostics are reported correctly resets style property value defined using [style.prop.px] retains JIT metadata unless JIT mode is explicitly disabled shadows all DOM properties in DebugElement.properties supports for #id bootstrap selectors

language-service: makes Function alias callable provides completions for attribute values recomputes analyzed modules only when source files change removed getTemplateReferences() from LanguageService API

ngcc: always adds exports for ModuleWithProviders references correctly associate decorators with aliased classes correctly include internal .d.ts files do not emit ES2015 code in ES5 files generate correct metadata for classes with getter/setter properties properly detect the origin of constructor param types

router: make routerLinkActive work with query params which contain arrays

zone.js: fixes typo of zone.js patch vrdisplaydisconnected property



Angular 9.0.0-rc.2

Breaking change for i18n:

The CLDR data has been updated to v36.0.0, which may cause some localized data strings to change. For example, the space separator used in numbers in the fr locales changed from \xa0 to \u202f.

Performance improvements for core:

Now avoids unnecessary creating provider factory

Reverts/fixes for Ivy:

When template changes in ngc watch mode, the component recompiles

If the user compiles modules with TestBed, this is the only case when registered modules can be restored

R3TestBed now cleans up registered modules after each test

Angular 9.0.0-rc.1

Features

common: support loading locales from a global

ivy: graceful evaluation of unknown or invalid expressions

ivy: implement unknown element detection in jit mode



Performance Improvements to Ivy

add new benchmark focused on template creation

add ngIf-like directive to the ng_template benchmark

avoid native node retrieval from LView

avoid repeated native node retrieval and patching

avoid repeated tNode.initialInputs reads

move local references into consts array

Bug Fixes

compiler-cli: attach the correct viaModule to namespace imports pass SourceFile to getLeadingTriviaWidth remove unused CLI private exports

core: renderer-to-renderer2 migration not migrating methods undecorated-classes-with-di migration should report config errors

ivy: event handlers avoid implicit errors fixed several crash issues related to unknown localref target and unknown pipe more descriptive errors for nested i18n sections

language-service: should no longer crash if expr ends unexpectedly

ngcc: handle new __spreadArrays tslib helper override getInternalNameOfClass() and getAdjacentNameOfClass() for ES5 render adjacent statements after static properties render new definitions using the inner name of the class

service-worker: ensure initialization before handling messages



Angular 9.0.0-next.7

Bug Fixes

bazel: ng_package(data) should support non-text files

compiler-cli: fix typo in the diagnostic template info

core: initialize global ngDevMode without top-level side effects make injector.get() return default value with InjectFlags.Self flag

ivy: avoid unnecessary i18n instructions generation for with structural directives correct debug array names DebugNode throws exceptions when querying some properties ensure that window.ng utilities are published when NgModules are used i18n – start generated placeholder name at PH i18n – update the compiler to output MessageIds i18n – use MessageId for matching translations

language-service: Lazily instantiate MetadataResolver Use tsLSHost.fileExists() to resolve modules

ngcc: consistently use outer declaration for classes correctly read static properties for aliased classes resolve imports in .d.ts files for UMD/CommonJS bundles support UMD global factory in comma lists



Features

bazel: support ts_library targets as entry-points for ng_package

core: add dynamic queries schematic Mark TestBed.get as deprecated

ivy: expose window.ng.getDebugNode helper i18n – add syntax support for $localize metadata block i18n – reorganize entry-points for better reuse

language-service: enable logging on TypeScriptHost provide diagnostic for invalid templateUrls provide diagnostics for invalid styleUrls



Performance Improvements

ivy: avoid metamorphic reads during property binding avoid repeated view reads in pipe instructions avoid repeated LView reads in property instructions avoid unnecessary DOM reads in styling instructions binding update benchmark convert all node-based benchmark to use a testing harness guard listening to outputs with isDirectiveHost initialize TNode inputs/outputs on the first creation pass introduce a benchmark for listeners registration limit TNode.outputs reads run the expanding rows benchmark with es2015

language-service: keep analyzedModules cache when source files don’t change



Deprecations

core: TestBed.get function is marked as deprecated, use TestBed.inject instead.



Angular 9.0.0-next.6

Bug fixes

core: improve the “missing $localize” error message

ivy: capture template source mapping details during preliminary analysis handle expressions in i18n attributes properly i18n – do not generate jsdoc comments for $localize maintain coalesced listeners order match class and attribute value without case-sensitivity node placed in incorrect order inside ngFor with ng-container restore global state after running refreshView template compiler should render correct $localize placeholder names unable to bind to properties that start with class or style unable to override ComponentFactoryResolver provider in tests warn instead of throwing for unknown properties

service-worker: keep serving clients on older versions if the latest is invalidated

ngcc: only back up the original prepublishOnly script and not the overwritten one

language-service: Return empty external files during project initialization Use module resolution cache



Code Refactoring

bazel: remove @angular/bazel protractor rule now provided by @bazel/protractor



Features

language-service: add definitions for styleUrls add a script to rebuild, refresh Angular dist

service-worker: recover from EXISTING_CLIENTS_ONLY mode when there is a valid update



Performance Improvements

ivy: check for animation synthetic props in dev mode only introduce a node-based micro-benchmarks harness replace select instruction with advance run tree benchmark with bundles and ngDevMode off

ngcc: process tasks in parallel in async mode



Breaking changes

bazel: Angular bazel users using protractor_web_test_suite from @angular/bazel npm package should now switch to the @bazel/protractor npm package.



Angular 9.0.0-next.5

Bug fixes

ivy: add missing closure extern for $localize ensure binding ordering doesn’t mess up when a NO_CHANGE value is encountered 18n – handle translated text containing HTML comments ngcc – improve the “ngcc version changed” error message Prevent errors when querying for elements outside Angular context

ngcc: handle compilation diagnostics

language-service: create DirectiveKind enum invalidate Reflector caches when the program changes update all files/directories owned by DevInfra to new DevInfra Framework team alias re-add regressed templateUrl tests use ts.CompletionEntry for completions

common: HttpParams fromObject accepts ReadonlyArray



Features

ivy: implement $localize() global function

language-service: add definitions for templateUrl

core: Adds DI support for providedIn: 'platform'|'any' Introduce TestBed.inject to replace TestBed.get



Performance Improvements

ivy: add a microbenchmark for map-based style and class bindings add a microbenchmark for style and class bindings add element and text creation benchmark guard directive-related operations with a TNode flag properly initialize global state in the element_text_create benchmark remove renderStringify calls for text nodes creation remove repeated memory read / write in addComponentLogic run registerPostOrderHooks in the first template pass only

core: Make PlatformLocation tree-shakable



Reverts

docs: create Issue and Pull Request markdown doc, explaining automatic locking policy



Breaking changes

ivy: This commit removes the public export of hasBeenProcessed()

core: Injector.get now accepts abstract classes to return type-safe values. The previous implementation returned any through the deprecated implementation.



Angular 9.0.0-next.4

Bug fixes

ivy: debug node names should match user declaration ngtsc throws if “flatModuleOutFile” is set to null reset binding index before executing a template in refreshView call

ngcc: does not analyze dependencies for non-Angular entry-points



Features

ivy: use the schema registry to check DOM bindings

core: add undecorated classes with decorated fields schematic



Performance Improvements

ivy: minimize writes to the lView[BINDING_INDEX] / binding root store binding metadata in the ngDevMode only



Angular 9.0.0-next.3

Bug fixes

bazel: pin [@microsoft](https://github.com/microsoft)/api-extractor

ivy: get name directly from nativeNode handle empty bindings in the template type checker in ngcc, handle inline exports in commonjs code ngcc should only index .d.ts exports within the package ngTemplateOutlet error when switching between null and template value run template type-checking for all components

compiler: return enableIvy true when using readConfiguration

ngcc: handle deep imports that already have an extension ignore format properties that exist but are undefined

language-service: instantiate MetadataResolver once remove ‘context’ used for module resolution

common: update $locationShim to notify onChange listeners before emitting AngularJS events



Features

language-service: support selector-less directive as base classes in Ivy make the Ivy compiler the default for ngc convert all ngtsc diagnostics to ts.Diagnostics

core: add undecorated classes migration schematic

forms: formControlName also accepts a number

compiler: allow selector-less directives as base classes in View Engine



Performance Improvements

ivy: auto-call select(0) for non-empty views only avoid first template pass checks during view creation avoid for-of loops at runtime improve NaN checks in change detection interpolation micro-benchmark noop change detection micro-benchmark don’t create holey arrays read selected index only when need in prop bindings split hooks processing into init and check phases split view processing into render (create) and refresh (update) pass

core: make sanitization tree-shakable in Ivy mode



Breaking changes

ivy: make Hammer support tree-shakable. Previously, in Ivy applications, Hammer providers were included by default. With this commit, apps that want Hammer support must import HammerModule in their root module.



Angular 9.0.0-next.2

Bug fixes

bazel: disable treeshaking when generating FESM and UMD bundles

ivy: reuse compilation scope for incremental template changes.

compiler: do not remove whitespace wrapping i18n expansions



Performance Improvements

ivy: doesn’t read global state when interpolated values don’t change



Angular 9.0.0-next.1

Bug fixes

language-service: getSourceFile() should only be called on TS files Make Definition and QuickInfo compatible with TS LS

upgrade: compile downgraded components synchronously (if possible)



You can also compare with the previous version Angular 8.0

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