In v7 of Angular we removed `tsickle` from the default `ngc` pipeline.
This had the negative potential of breaking ES2015 output and SSR due
to a limitation in TypeScript.
TypeScript by default preserves type information for decorated constructor
parameters when `emitDecoratorMetadata` is enabled. For example,
consider this snippet below:
```
@Directive()
export class MyDirective {
constructor(button: MyButton) {}
}
export class MyButton {}
```
TypeScript would generate metadata for the `MyDirective` class it has
a decorator applied. This metadata would be needed in JIT mode, or
for libraries that provide `MyDirective` through NPM. The metadata would
look as followed:
```
let MyDirective = class MyDir {}
MyDirective = __decorate([
Directive(),
__metadata("design:paramtypes", [MyButton]),
], MyDirective);
let MyButton = class MyButton {}
```
Notice that TypeScript generated calls to `__decorate` and
`__metadata`. These calls are needed so that the Angular compiler
is able to determine whether `MyDirective` is actually an directive,
and what types are needed for dependency injection.
The limitation surfaces in this concrete example because `MyButton`
is declared after the `__metadata(..)` call, while `__metadata`
actually directly references `MyButton`. This is illegal though because
`MyButton` has not been declared at this point. This is due to the
so-called temporal dead zone in JavaScript. Errors like followed will
be reported at runtime when such file/code evaluates:
```
Uncaught ReferenceError: Cannot access 'MyButton' before initialization
```
As noted, this is a TypeScript limitation because ideally TypeScript
shouldn't evaluate `__metadata`/reference `MyButton` immediately.
Instead, it should defer the reference until `MyButton` is actually
declared. This limitation will not be fixed by the TypeScript team
though because it's a limitation as per current design and they will
only revisit this once the tc39 decorator proposal is finalized
(currently stage-2 at time of writing).
Given this wontfix on the TypeScript side, and our heavy reliance on
this metadata in libraries (and for JIT mode), we intend to fix this
from within the Angular compiler by downleveling decorators to static
properties that don't need to evaluate directly. For example:
```
MyDirective.ctorParameters = () => [MyButton];
```
With this snippet above, `MyButton` is not referenced directly. Only
lazily when the Angular runtime needs it. This mitigates the temporal
dead zone issue caused by a limitation in TypeScript's decorator
metadata output. See: https://github.com/microsoft/TypeScript/issues/27519.
In the past (as noted; before version 7), the Angular compiler by
default used tsickle that already performed this transformation. We
moved the transformation to the CLI for JIT and `ng-packager`, but now
we realize that we can move this all to a single place in the compiler
so that standalone ngc consumers can benefit too, and that we can
disable tsickle in our Bazel `ngc-wrapped` pipeline (that currently
still relies on tsickle to perform this decorator processing).
This transformation also has another positive side-effect of making
Angular application/library code more compatible with server-side
rendering. In principle, TypeScript would also preserve type information
for decorated class members (similar to how it did that for constructor
parameters) at runtime. This becomes an issue when your application
relies on native DOM globals for decorated class member types. e.g.
```
@Input() panelElement: HTMLElement;
```
Your application code would then reference `HTMLElement` directly
whenever the source file is loaded in NodeJS for SSR. `HTMLElement`
does not exist on the server though, so that will become an invalid
reference. One could work around this by providing global mocks for
these DOM symbols, but that doesn't match up with other places where
dependency injection is used for mocking DOM/browser specific symbols.
More context in this issue: #30586. The TL;DR here is that the Angular
compiler does not care about types for these class members, so it won't
ever reference `HTMLElement` at runtime.
Fixes#30106. Fixes#30586. Fixes#30141.
Resolves FW-2196. Resolves FW-2199.
PR Close#37382
In #29083 a call to `getCompilerFacade` was added to `ApplicationRef` which pulls in a bit of JIT-specific code. Since the code path that calls the function can't be hit for an AOT-compiled app, these changes add an `ngJitMode` guard which will allow for dead code elimination to drop it completely. Testing it out against a new CLI project showed a difference of ~1.2kb.
PR Close#37372
lifecycle hooks api detailed documentation contained links which were pointing to onChanges hook only which is removed, made each hook point towards its deafult page link
PR Close#36557
Previously the comments for these files referenced a path to "packages/core/src/render3/jit/compiler_facade_interface.ts" that does not exist in the current codebase.
This PR corrects the path in these comments.
PR Close#37370
Looks like we broke the `hasLocalChanges` check in the git client
when we moved it over from the merge script. The problem is that
we are using `git` in the first argument of `git.run`. That
means that we under-the-hood run `git git <..>`.
This commit fixes that, but also switches to a better variant
for ensuring no local changes because it exits with non-zero
when there are local changes.
PR Close#37489
The dev-infra rebase PR script currently does not work due to
the following issues:
1. The push refspec is incorrect. It refers to the `base` of the PR, and
not to the `head` of the PR.
2. The push `--force-with-lease` option does not work in a detached head
as no remote-tracking branch is set up.
PR Close#37489
We recently moved over the git client from the merge script to the
common dev-infra utils. This made specifying a token optional, but
it looks like the logic for sanitizing messages doesn't account
for that, and we currently add `<TOKEN>` between every message
character. e.g.
```
Executing: git <TOKEN>g<TOKEN>i<TOKEN>t<TOKEN>
<TOKEN>s<TOKEN>t<TOKEN>a<TOKEN>t<TOKEN>u<TOKEN>s<TOKEN>
```
PR Close#37489
Previously, we would simply prepend any relative URL with the HREF
for the current route (pulled from document.location). However,
this does not correctly account for the leading slash URLs that
would otherwise be parsed correctly in the browser, or the
presence of a base HREF in the DOM.
Therefore, we use the built-in URL implementation for NodeJS,
which implements the WHATWG standard that's used in the browser.
We also pull the base HREF from the DOM, falling back on the full
HREF as the browser would, to form the correct request URL.
Fixes#37314
PR Close#37341
Prevent duplicate notifications from being emitted when multiple URL change listeners are registered using SpyLocation#onUrlChange.
Use `@internal` annotation for the `_urlChangeSubscription` properties instead of the `private` access modifier. Otherwise, we get in trouble because of `SpyLocation implements Location`.
PR Close#37459
Use the strongly typed TestBed.inject rather than the weakly typed inject test utility function. Reuse injected dependency variables between sibling test cases.
PR Close#37459
Keen and I were talking about what it would take to support getting
references at a position in the current language service, since it's
unclear when more investment in the Ivy LS will be available. Getting TS
references from a template is trivial -- we simply need to get the
definition of a symbol, which is already handled by the language
service, and ask the TS language service to give us the references for
that definition.
This doesn't handle references in templates, but that could be done in a
subsequent pass.
Part of https://github.com/angular/vscode-ng-language-service/issues/29
PR Close#37437
The function signature selection algorithm is totally naive. It'd
unconditionally pick the first signature if there are multiple
overloads. This commit improves the algorithm by returning an exact
match if one exists.
PR Close#37494
Partial resubmit of #26243
Fixes incorrect url tree generation for empty path components with children.
Adds a test to demonstrate the failure of createUrlTree for those routes.
Fixes#13011Fixes#35687
PR Close#37446
Libraries are still build using view engine even after Ivy being the default engine for building angular apps. Added note on why libraries are built using VE and how they will be automatically compiled in Ivy using ngcc making it compatible for both
Fixes#35625
PR Close#36556
There is great workaround for implementing staleWhileRevalidate strategy in service-worker by setting strategy to freshness and timeout to 0u. Documented this in service worker config where all other strategies are documented
Fixes#20402
PR Close#37301
This PR provides a more helpful error than the one currently present:
`el.setAttribute is not a function`. It is not valid to have directives with host bindings
on `ng-template` or `ng-container` nodes. VE would silently ignore this, while Ivy
attempts to set the attribute and throws an error because these are comment nodes
and do not have `setAttribute` functionality.
It is better to throw a helpful error than to silently ignore this because
putting a directive with host binding on an `ng-template` or `ng-container` is most often a mistake.
Developers should be made aware that the host binding will have no effect in these cases.
Note that an error is already thrown in Ivy, as mentioned above, so this
is not a breaking change and can be merged to both master and patch.
Resolves#35994
PR Close#37111
This commit removes all markers from the inline template in
`AppComponent` and external template in `TemplateReference`.
Test scenarios should be colocated with the test cases themselves.
Besides, many existing cases are invalid. For example, if we want to
test autocomplete for HTML element, the existing test case is like:
```
<~{cursor} h1>
```
This doesn't make much sense, becasue the language service already sees
the `h1` tag in the template. The correct test case should be:
```
<~{cursor
```
IMO, this reflects the real-world use case better.
This commit also uncovers a bug in the way HTML entities autocompletion
is done. There's an off-by-one error in which a cursor that immediately
trails the ampersand character fails to trigger HTML entities
autocompletion.
PR Close#37475
Historically we have had a pullapprove group `fallback` which acted as
a catch all for files which did not match any other groups. This
group assigned reviews to IgorMinar, however it was not apparent that
this group was assigned. This change removes this assignment. This
group as active should always coincide with failures of the pullapprove
verification script. We continue to have this group as a secondary test
ensuring all files in the repo are captured by the pullapprove config.
PR Close#36456
**Problem**
After #31109 and #31865, it's still possible to get locked in state
`EXISTING_CLIENTS_ONLY`, without any possibility to get out (even by
pushing new updates on the server).
More specifically, if control doc `/latest` of `ngsw:/:db:control` once
gets a bad value, then the service worker will fail early, and won't be
able to overwrite `/latest` with new, valid values (the ones from future
updates).
For example, once in this state, URL `/ngsw/state` will show:
NGSW Debug Info:
Driver state: EXISTING_CLIENTS_ONLY (Degraded due to failed initialization: Invariant violated (initialize): latest hash 8b75… has no known manifest
Error: Invariant violated (initialize): latest hash 8b75… has no known manifest
at Driver.<anonymous> (https://my.app/ngsw-worker.js:2302:27)
at Generator.next (<anonymous>)
at fulfilled (https://my.app/ngsw-worker.js:175:62))
Latest manifest hash: 8b75…
Last update check: 22s971u
... with hash `8b75…` corresponding to no installed version.
**Solution**
Currently, when such a case happens, the service worker [simply fails
with an assertion][1]. Because this failure happens early, and is not
handled, the service worker is not able to update `/latest` to new
installed app versions.
I propose to detect this corrupted case (a `latest` hash that doesn't
match any installed version) a few lines above, so that the service
worker can correctly call its [already existing cleaning code][2].
[1]: https://github.com/angular/angular/blob/3569fdf/packages/service-worker/worker/src/driver.ts#L559-L563
[2]: https://github.com/angular/angular/blob/3569fdf/packages/service-worker/worker/src/driver.ts#L505-L519
This change successfully fixes the problem described above.
Unit test written with the help of George Kalpakas. Thank you!
PR Close#37453
The new tooling-cli-shared-api is used to guard changes to packages/compiler-cli/src/tooling.ts
which is a private API sharing channel between Angular FW and CLI.
Changes to this file should be rare and explicitly approved by at least two members
of the CLI team.
PR Close#37467
Update the pullapprove config to require multiple reviews for sensitive groups in order
to force distribution of knowledge and improve the review quality.
PR Close#37467
Previously, event listeners for component output events attached on an
Angular custom element before inserting it into the DOM (i.e. before
instantiating the underlying component) didn't fire for events emitted
during initialization lifecycle hooks, such as `ngAfterContentInit`,
`ngAfterViewInit`, `ngOnChanges` (initial call) and `ngOnInit`.
The reason was that that `NgElementImpl` [subscribed to events][1]
_after_ calling [ngElementStrategy#connect()][2], which is where the
[initial change detection][3] takes place (running the initialization
lifecycle hooks).
This commit fixes this by:
1. Ensuring `ComponentNgElementStrategy#events` is defined and available
for subscribing to, even before instantiating the component.
2. Ensuring `NgElementImpl` subscribes to `NgElementStrategy#events`
before calling `NgElementStrategy#connect()` (which initializes the
component instance).
Jira issue: [FW-2010](https://angular-team.atlassian.net/browse/FW-2010)
[1]: c0143cb2ab/packages/elements/src/create-custom-element.ts (L167-L170)
[2]: c0143cb2ab/packages/elements/src/create-custom-element.ts (L164)
[3]: c0143cb2ab/packages/elements/src/component-factory-strategy.ts (L158)Fixes#36141
PR Close#36161
Now in TS 3.9, classes in ES2015 can be wrapped in an IIFE.
This commit ensures that we still find the static properties that contain
decorator information, even if they are attached to the adjacent node
of the class, rather than the implementation or declaration.
Fixes#37330
PR Close#37436
There is an `exec()` helper provided by `utils/shelljs.ts`, which is a
wrapper around ShellJS' `exec()` with some default options (currently
`silent: true`). The intention is to avoid having to pass these options
to every invocation of the `exec()` function.
This commit updates all code inside `dev-infra/` to use this helper
whenever possible).
NOTE: For simplicity, the `utils/shelljs` helper does not support some
of the less common call signatures of the original `exec()`
helper, so in some cases we still need to use the original.
PR Close#37444
This change just fixes various typos and misspellings across several docs.
I've included also a fix for an issue surfaced via #37423.
Closes#37423
PR Close#37443
Clean up pullapprove tooling to use newly created common utils.
Additionally, use newly created logging levels rather than
verbose flagging.
PR Close#37338
Update the commit sha to require that PRs have been rebased beyond the one which has new header requirements so we don't get failures after merging
PR Close#37424
We recently added a better reporting mechanism for oauth tokens
in the dev-infra git util. Unfortunately the logic broke as part
of addressing PR review feedback. Right now, always the empty
promise from `oauthScopes` will be used as `getAuthScopes` considers
it as the already-requested API value. This is not the case as
the default promise is also truthy. We should just fix this by making
the property nullable.
PR Close#37439
Adds an assertion that the provided TOKEN has OAuth scope permissions for `repo`
as this is required for all merge attempts.
On failure, provides detailed error message with remediation steps for the user.
PR Close#37421
This finder is designed to only process entry-points that are reachable
by the program defined by a tsconfig.json file.
It is triggered by calling `mainNgcc()` with the `findEntryPointsFromTsConfigProgram`
option set to true. It is ignored if a `targetEntryPointPath` has been
provided as well.
It is triggered from the command line by adding the `--use-program-dependencies`
option, which is also ignored if the `--target` option has been provided.
Using this option can speed up processing in cases where there is a large
number of dependencies installed but only a small proportion of the
entry-points are actually imported into the application.
PR Close#37075
atscott
Paul Gschwendtner
Joey Perrott
crisbeto
Andrew Scott
Ajit Singh
AleksanderBodurri
Adam
Lars Gyrup Brink Nielsen
Ayaz Hafiz
Keen Yee Liau
Gerald Lang
George Kalpakas
Pete Bacon Darwin
Adrien Vergé
Wagner Maciel
Greg Magolan
Igor Minar
Amadou Sall