Currently `EmbeddedViewRef.context` is read-only which means that the only way to update
it is to mutate the object which can lead to some undesirable outcomes if the template
and the context are provided by an external consumer (see #24515).
These changes make the property writeable since there doesn't appear to be a specific
reason why it was readonly to begin with.
PR Close#40360
fix https://github.com/angular/components/issues/21674
When setting `ngZoneRunCoalescing` to true, `onStable` is not emitted correctly.
the reason is before this commit, the code looks like this:
```
// application code call `ngZone.run()`
ngzone.run(() => {}); // step 1
// inside NgZone, in the OnInvoke hook, NgZone try to delay the checkStable()
function delayChangeDetectionForEvents(zone: NgZonePrivate) {
if (zone.lastRequestAnimationFrameId !== -1) { // step 9
return;
}
zone.lastRequestAnimationFrameId = zone.nativeRequestAnimationFrame.call(global, () => { // step 2
if (!zone.fakeTopEventTask) {
zone.fakeTopEventTask = Zone.root.scheduleEventTask('fakeTopEventTask', () => {
zone.lastRequestAnimationFrameId = -1; // step 3
updateMicroTaskStatus(zone); // step 4
checkStable(zone); // step 6
}, undefined, () => {}, () => {});
}
zone.fakeTopEventTask.invoke();
});
updatemicroTaskStatus(zone);
}
function updateMicroTaskStatus(zone: NgZonePrivate, ignoreCheckRAFId = false) {
if (zone._hasPendingMicrotasks ||
((zone.shouldCoalesceEventChangeDetection || zone.shouldCoalesceRunChangeDetection) &&
zone.lastRequestAnimationFrameId !== -1)) { // step 5
zone.hasPendingMicrotasks = true;
} else {
zone.hasPendingMicrotasks = false;
}
}
function checkStable(zone: NgZonePrivate) {
if (zone._nesting == 0 && !zone.hasPendingMicrotasks && !zone.isStable) { // step 7
try {
zone._nesting++;
zone.onMicrotaskEmpty.emit(null);
...
}
// application ref subscribe onMicroTaskEmpty
ngzone.onMicroTaskEmpty.subscribe(() => {
ngzone.run(() => { // step 8
tick();
});
});
```
and the process is:
1. step 1: application call ngZone.run()
2. step 2: NgZone delay the checkStable() call in a requestAnimationFrame, and also set
zone.lastRequestAnimationFrameId
3. step 3: Inside the requestAnimationFrame callback, reset zone.lastRequestAnimationFrameId first
4. step 4: update microTask status
5, step 5: if zone.lastRequestAnimationFrameId is -1, that means no microTask pending.
6. step 6: checkStable and trigger onMicrotaskEmpty emitter.
7. step 7: ApplicationRef subscribed onMicrotaskEmpty, so it will call another `ngZone.run()` to process
tick()
8. step 8: And this new `ngZone.run()` will try to check `zone.lastRequestAnimationFrameId` in `step 9`
when trying to delay the checkStable(), and since the zone.lastRequestAnimationFrameId is already reset
to -1 in step 3, so this ngZone.run() will run into step 2 again.
9. and become a infinite loop..., so onStable is never emit
in this commit, there is a new flag `zone.isCheckStableRunning` added to
prevent re-entry when `shouldCoaleascing` flag is enabled.
PR Close#40540
This commit adds support for Observables that now can be used as a part of APP_INITIALIZER. Previously, only
Primises were supported.
Closes#15088.
PR Close#33222
This PR performs a small refactoring to use `RuntimeError` class and corresponding error code (by calling
`throwProviderNotFoundError` which formats the message) to make it more consistent with other places where
similar errors are thrown.
PR Close#40901
This is a pre-requisite for #40360. Given the following template which has a listener
that references a variable from a parent template (`name`):
```
<ng-template let-name="name">
<button (click)="hello(name)"></button>
</ng-template>
```
We generate code that looks that looks like. Note how we access `name` through `ctx`:
```js
function template(rf, ctx) {
if (rf & 1) {
const r0 = ɵɵgetCurrentView();
ɵɵelementStart(0, "button", 2);
ɵɵlistener("click", function() {
ɵɵrestoreView(r0);
const name_r0 = ctx.name; // Note the `ctx.name` access here.
const ctx_r1 = ɵɵnextContext();
return ctx_r1.log(name_r0);
});
ɵɵelementEnd();
}
}
```
This works fine at the moment, because the template context object can't be changed after creation.
The changes in #40360 allow for the object to be changed, which means that the `ctx` reference
inside the listener will be out of date, because it was bound during creation mode.
This PR aims to address the issue by accessing the context inside listeners through the saved
view reference. With the new code, the generated code from above will look as follows:
```js
function template(rf, ctx) {
if (rf & 1) {
const r0 = ɵɵgetCurrentView();
ɵɵelementStart(0, "button", 2);
ɵɵlistener("click", function() {
const restoredCtx = ɵɵrestoreView(r0);
const name_r0 = restoredCtx.name;
const ctx_r1 = ɵɵnextContext();
return ctx_r1.log(name_r0);
});
ɵɵelementEnd();
}
}
```
PR Close#40833
This commit adds `ngDevMode` guard to show the warning only
in dev mode (similar to how things work in other parts of Ivy runtime code).
The `ngDevMode` flag helps to tree-shake the warning from production builds
(in dev mode everything will work as it works right now) to decrease production bundle size.
PR Close#40876
In Chrome 83 passing a TrustedScript to eval just returns the
TrustedScript back without evaluating it, causing the
newTrustedFunctionFor{Dev,JIT} functions to fail. This is a browser bug
that has been fixed in Chrome 84, and only affects Angular applications
running with JIT (which includes unit tests).
As a temporary workaround for users still on Chrome 83, detect when this
occurs in the newTrustedFunctionFor* functions and fall back to the
straightforward, non-Trusted Types compatible implementation. The only
combination that is left affected consists of Angular applications
running with JIT, that have explicitly configured Trusted Types in
enforcement mode, with users that are still on Chrome 83.
Also correct docstring for newTrustedFunctionForJIT.
PR Close#40815
This commit implements creating of `ɵɵngDeclarePipe()` calls in partial
compilation, and processing of those calls in the linker and JIT compiler.
See #40677
PR Close#40803
This commit fixes the issue of the ASSERTION ERROR issue when
a projected node(RNode) inside an array is checked against the types
of TNodeType.Element, TNodeType.Container, TNodeType.ElementContainer,
TNodeType.IcuContainer, TNodeType.Projection. As it's inside an array,
it doesn't fall into any of those types, as a result, it throws
the ASSERTION ERROR.
PR Close#37120
PR Close#37167
The `AsyncPipe.transform<T>(emitter)` method must infer the `T`
type from the `emitter` parameter. Since we changed the `AsyncPipe`
to expect a `Subscribable<T>` rather than `Observable<T>` the
`EventEmitter.subscribe()` method needs to have a tighter signature.
Otherwise TypeScript struggles to infer the type and ends up making
it `unknown`.
Fixes#40637
PR Close#40644
fix https://github.com/angular/components/issues/21674
When setting `ngZoneRunCoalescing` to true, `onStable` is not emitted correctly.
The reason is before this commit, the code looks like this
```
// Application code call `ngZone.run()`
ngZone.run(() => {}); // step 1
// Inside NgZone, in the OnInvoke hook, NgZone try to delay the checkStable()
function delayChangeDetectionForEvents(zone: NgZonePrivate) {
if (zone.lastRequestAnimationFrameId !== -1) { // step 9
return;
}
zone.lastRequestAnimationFrameId = zone.nativeRequestAnimationFrame.call(global, () => { // step 2
if (!zone.fakeTopEventTask) {
zone.fakeTopEventTask = Zone.root.scheduleEventTask('fakeTopEventTask', () => {
zone.lastRequestAnimationFrameId = -1; // step 3
updateMicroTaskStatus(zone); // step 4
checkStable(zone); // step 6
}, undefined, () => {}, () => {});
}
zone.fakeTopEventTask.invoke();
});
updateMicroTaskStatus(zone);
}
function updateMicroTaskStatus(zone: NgZonePrivate, ignoreCheckRAFId = false) {
if (zone._hasPendingMicrotasks ||
((zone.shouldCoalesceEventChangeDetection || zone.shouldCoalesceRunChangeDetection) &&
zone.lastRequestAnimationFrameId !== -1)) { // step 5
zone.hasPendingMicrotasks = true;
} else {
zone.hasPendingMicrotasks = false;
}
}
function checkStable(zone: NgZonePrivate) {
if (zone._nesting == 0 && !zone.hasPendingMicrotasks && !zone.isStable) { // step 7
try {
zone._nesting++;
zone.onMicrotaskEmpty.emit(null);
...
}
// application ref subscribe onMicroTaskEmpty
ngZone.onMicroTaskEmpty.subscribe(() => {
ngZone.run(() => { // step 8
tick();
});
});
```
And the process is:
1. step 1: application call ngZone.run()
2. step 2: NgZone delay the checkStable() call in a requestAnimationFrame, and also set
zone.lastRequestAnimationFrameId
3. step 3: Inside the requestAnimationFrame callback, reset zone.lastRequestAnimationFrameId first
4. step 4: update microTask status
5, step 5: if zone.lastRequestAnimationFrameId is -1, that means no microTask pending.
6. step 6: checkStable and trigger onMicrotaskEmpty emitter.
7. step 7: ApplicationRef subscribed onMicrotaskEmpty, so it will call another `ngZone.run()` to process
tick()
8. step 8: And this new `ngZone.run()` will try to check `zone.lastRequestAnimationFrameId` in `step 9`
when trying to delay the checkStable(), and since the zone.lastRequestAnimationFrameId is already reset
to -1 in step 3, so this ngZone.run() will run into step 2 again.
9. And become a infinite loop..., so onStable is never emit
In this commit, the `zone.lastRequestAnimationFrameId` reset is moved after `checkStable()` call.
PR Close#40540
The codebase currently contains several `EMPTY_ARRAY` constants,
and they can end up in the bundle of an application.
A recent commit 6fbe219 tipped us off
as it introduced several `noop` occurrences in the golden symbol files.
After investigating with @petebacondarwin,
we decided to remove the duplicated symbols.
This probably shaves only a few bytes,
but this commit removes the duplicated functions,
by always using the one in `core/src/utils/empty`.
PR Close#40587
Previously, in `_mismatch()`, the `DefaultIterableDiffer` first checks
`_linkedRecords` for `itemTrackBy`, then checks `_unlinkedRecords`.
This cause the `DefaultIterableDiffer` to move "later" items that match the
`itemTrackBy` from the old collection, rather than using the "earlier" one.
Now we check `_unlinkedRecords` first, so that the `DefaultIterableDiffer`
can give a more stable and reasonable result after diffing. For example,
rather than (`a1` and `a2` have same trackById)
```
a1 b c a2 => b a2 c a1
```
we get
```
a1 b c a2 => b a1 c a2
```
where a1 and a2 retain their original order despite both
having the same track by value.
Fixes#23815
PR Close#23941
This is a follow up fix for
894286dd0c.
It turns out that comments can be closed in several ways:
- `<!-->`
- `<!-- -->`
- `<!-- --!>`
All of the above are valid ways to close comment per:
https://html.spec.whatwg.org/multipage/syntax.html#comments
The new fix surrounds `<` and `>` with zero width space so that it
renders in the same way, but it prevents the comment to be closed eagerly.
PR Close#40525
This is a follow up fix for
894286dd0c.
It turns out that comments can be closed in several ways:
- `<!-->`
- `<!-- -->`
- `<!-- --!>`
All of the above are valid ways to close comment per:
https://html.spec.whatwg.org/multipage/syntax.html#comments
The new fix surrounds `<` and `>` with zero width space so that it
renders in the same way, but it prevents the comment to be closed eagerly.
PR Close#40525
The injector system uses a bloom filter to determine if a token is
possibly defined in the node injector tree, which is stored across
multiple bloom buckets that each represent 32 bits of the full 256-bit
wide bloom hash. This means that a computation is required to determine
the exact bloom bucket which is responsible for storing any given 32-bit
interval, which was previously computed using three bitmask operations
and three branches to derive the bloom bucket offset.
This commit exploits the observation that all bits beyond the low 5 bits
of the bloom hash are an accurate representation for the bucket offset,
if shifted right such that those bits become the least significant bits.
This reduces the three bitmask operations and three branches with a
single shift operation, while additionally offering a code size
improvement.
PR Close#40489
Because the query now has `flags` which specify the mode, the static query
instruction can now be remove. It is simply normal query with `static` flag.
PR Close#40091
Previous implementation would fire changes `QueryList.changes.subscribe`
whenever the `QueryList` was recomputed. This resulted in artificially
high number of change notifications, as it is possible that recomputing
`QueryList` results in the same list. When the `QueryList` gets recomputed
is an implementation detail and it should not be the thing which determines
how often change event should fire.
This change introduces a new `emitDistinctChangesOnly` option for
`ContentChildren` and `ViewChildren`.
```
export class QueryCompWithStrictChangeEmitParent {
@ContentChildren('foo', {
// This option will become the default in the future
emitDistinctChangesOnly: true,
})
foos!: QueryList<any>;
}
```
PR Close#40091
This commit updates the logic that calculates `useFactory` function arguments to avoid relying on `instanceof`
checks (thus always retaining symbols) and relies on flags that DI decorators contain (as a monkey-patched property).
Another perf benefit is having less megamorphic reads while calculating args for the `useFactory` call: we used to
check whether a token has `ngMetadataName` property 4 times (in worst case), now we have just 1 megamorphic read in
all cases.
Closes#40143.
PR Close#40145
The `template` and `isInline` fields were previously stored in a nested
object, which was initially done to accommodate for additional template
information to support accurate source maps for external templates. In
the meantime the source mapping has been accomplished in a different
way, and I feel this flattened structure is simpler and smaller so is
preferable over the nested object. This change also makes the `isInline`
property optional with a default value of `false`.
PR Close#40383
When we attach a `ViewRef` to a `ViewContainerRef`, we save a reference to the container
onto the `ViewRef` so that we can remove it when the ref is destroyed. The problem is
that if the container's `hostView` is destroyed first, the `ViewRef` has no way of knowing
that it should stop referencing the container.
These changes remove the leak by not saving a reference at all. Instead, when a `ViewRef`
is destroyed, we clean it up through the `LContainer` directly. We don't need to worry
about the case where the container is destroyed before the view, because containers
automatically clean up all of their views upon destruction.
Fixes#38648.
PR Close#40219
In some browsers, notably a mobile version of webkit on iPad, the
result of calling `DOMParser.parseFromString()` returns a document
whose `body` property is null until the next tick of the browser.
Since this is of no use to us for sanitization, we now fall back to the
"inert document" strategy for this case.
Fixes#39834
PR Close#40107
The `ɵɵngDeclareComponent` calls are designed to be translated to fully
AOT compiled code during a build transform, but in cases this is not
done it is still possible to compile the declaration object in the
browser using the JIT compiler. This commit adds a runtime
implementation of `ɵɵngDeclareComponent` which invokes the JIT compiler
using the declaration object, such that a compiled component definition
is made available to the Ivy runtime.
PR Close#40127
The trustConstantHtml and trustConstantResourceUrl functions are only
meant to be passed constant strings extracted from Angular application
templates, as passing other strings or variables could introduce XSS
vulnerabilities.
To better protect these APIs, turn them into template tags. This makes
it possible to assert that the associated template literals do not
contain any interpolation, and thus must be constant.
Also add tests for the change to prevent regression.
PR Close#40082
DI providers can be defined via `useFactory` function, which may have arguments configured via `deps` array.
The `deps` array may contain DI flags represented by DI decorators (such as `@Self`, `@SkipSelf`, etc). Prior to this
commit, having the `@Host` decorator in `deps` array resulted in runtime error in Ivy. The problem was that the `@Host`
decorator was not taken into account while `useFactory` argument list was constructed, the `@Host` decorator was
treated as a token that should be looked up.
This commit updates the logic which prepares `useFactory` arguments to recognize the `@Host` decorator.
PR Close#40122
The `ɵɵngDeclareDirective` calls are designed to be translated to fully
AOT compiled code during a build transform, but in cases this is not
done it is still possible to compile the declaration object in the
browser using the JIT compiler. This commit adds a runtime
implementation of `ɵɵngDeclareDirective` which invokes the JIT compiler
using the declaration object, such that a compiled directive definition
is made available to the Ivy runtime.
PR Close#40101
Internally we store lifecycle hooks in the format `[index, hook, index, hook]` and when
iterating over them, we check one place ahead to figure out whether we've hit found
a hook or an index. The problem is that the loop is set up to iterate up to `hooks.length`
which means that we may go out of bounds on the last iteration, depending on where
we started. This appears to happen under a specific set of circumstances where a
directive calls `detectChanges` from an input setter while it has `ngOnChanges` and
`ngAfterViewInit` hooks.
These changes resolve the issue by only iterating up to `length - 1` which guarantees that
we can always look one place ahead.
This appears to have regressed some time in version 10.
Fixes#38611.
PR Close#40206
The types of directives and pipes that are used in a component's
template may be emitted into the partial declaration wrapped inside a
closure, which is needed when the type is declared later in the module.
This poses a problem for JIT compilation of partial declarations, as
this closure is indistinguishable from a class reference itself. To mark
the forward reference function as such, this commit changes the partial
declaration codegen to emit a `forwardRef` invocation wrapped around
the closure, which ensures that the closure is properly tagged as a
forward reference. This allows the forward reference to be treated as
such during JIT compilation.
PR Close#40117
PR #39876 introduced an error where the `onDestroy` of `ComponentRef`
would only get called if `ngDevMode` was set to true. This was because
in dev mode we would freeze `TCleanup` to verify that no more
static cleanup would get added to `TCleanup` array. This ensured
that `TCleanup` was always present in dev mode. In production the
`TCleanup` would get created only when needed. The resulting cleanup
code was incorrectly indented and would only run if `TCleanup` was
present causing this issue.
Fix#40105
PR Close#40120
Escape the content of the strings so that it can be safely inserted into a comment node.
The issue is that HTML does not specify any way to escape comment end text inside the comment.
`<!-- The way you close a comment is with "-->". -->`. Above the `"-->"` is meant to be text
not an end to the comment. This can be created programmatically through DOM APIs.
```
div.innerHTML = div.innerHTML
```
One would expect that the above code would be safe to do, but it turns out that because comment
text is not escaped, the comment may contain text which will prematurely close the comment
opening up the application for XSS attack. (In SSR we programmatically create comment nodes which
may contain such text and expect them to be safe.)
This function escapes the comment text by looking for the closing char sequence `-->` and replace
it with `-_-_>` where the `_` is a zero width space `\u200B`. The result is that if a comment
contains `-->` text it will render normally but it will not cause the HTML parser to close the
comment.
PR Close#40136
Prior to this change, the `setClassMetadata` call would be invoked
inside of an IIFE that was marked as pure. This allows the call to be
tree-shaken away in production builds, as the `setClassMetadata` call
is only present to make the original class metadata available to the
testing infrastructure. The pure marker is problematic, though, as the
`setClassMetadata` call does in fact have the side-effect of assigning
the metadata into class properties. This has worked under the assumption
that only build optimization tools perform tree-shaking, however modern
bundlers are also able to elide calls that have been marked pure so this
assumption does no longer hold. Instead, an `ngDevMode` guard is used
which still allows the call to be elided but only by tooling that is
configured to consider `ngDevMode` as constant `false` value.
PR Close#39987
Differs tries to inject parent differ in order to support extending.
This does not work in the 'root' injector as the provider overrides the
default injector. The fix is to just assume standard set of providers
and extend those instead.
PR close#25015
Issue close#11309 `Can't extend IterableDiffers`
Issue close#18554 `IterableDiffers.extend is not AOT compatible`
(This is fixed because we no longer have an arrow function in the
factory but a proper function which can be imported.)
PR Close#39981
This commit adds `ngDevMode` guard to run `checkNoChanges` only
in dev mode (similar to how things work in other parts of Ivy runtime code).
The `ngDevMode` flag helps to tree-shake this code from production builds
(in dev mode everything will work as it works right now) to decrease production bundle size.
PR Close#39964
This commit adds `ngDevMode` guard to show sanitization warnings only
in dev mode (similar to how things work in other parts of Ivy runtime code).
The `ngDevMode` flag helps to tree-shake these warnings from production builds
(in dev mode everything will work as it works right now) to decrease production bundle size.
PR Close#39959
