Prior to this commit, i18n attributes defined on `<ng-template>` tags were not processed by the compiler. This commit adds the necessary logic to handle i18n attributes in the same way how these attrs are processed for regular elements.
PR Close#35681
This commit extends the range of tNode types that may have local refs to include `TNodeType.Container` to account for `<ng-template>`s. Original changes in https://github.com/angular/angular/pull/33415 didn't include that type and as a result, an error is thrown at runtime in case an i18n block contains an `<ng-template>` with local refs.
PR Close#35758
If an injectable has a `useClass`, Ivy injects the token in `useClass`, rather than the original injectable, if the injectable is re-provided under a different token. The correct behavior is that it should inject the re-provided token, no matter whether it has `useClass`.
Fixes#34110.
PR Close#34574
When binding to `[style]` we correctly sanitized/unwrapped properties but we did not do it for the object itself.
```
@HostBinding("style")
style: SafeStyle = this.sanitizer.bypassSecurityTrustStyle(
"background: red; color: white; display: block;"
);
```
Above code would fail since the `[style]` would not unwrap the `SafeValue` and would treat it as object resulting in incorrect behavior.
Fix#35476 (FW-1875)
PR Close#35564
Currently we resolve the `NgModuleRef.componentFactoryResolver` by going through the injector, but the problem is that `ComponentFactoryResolver` has a dependency on `NgModuleRef`, which means that if the module that's attached to the ref tries to inject `ComponentFactoryResolver` in its constructor, we'll create a circular dependency which throws at runtime.
These changes resolve the issue by creating the `ComponentFactoryResolver` manually ahead of time without going through the injector. We can do this safely, because the only dependency for the resolver is the current module ref which is providing it.
Aside from fixing the issue, another advantage to this approach is that it should reduce the amount of generated JS, because it removes a getter and a provider definitio.
Fixes#35580.
PR Close#35637
In #33705 we made it so that we generate pure functions for object/array literals in order to avoid having them be shared across elements/views. The problem this introduced is that further down the line the `ContantPool` uses the generated literal in order to figure out whether to share an existing factory or to create a new one. `ConstantPool` determines whether to share a factory by creating a key from the AST node and using it to look it up in the factory cache, however the key generation function didn't handle function invocations and replaced them with `null`. This means that the key for `{foo: pureFunction0(...)}` and `{foo: null}` are the same.
These changes rework the logic so that instead of generating a `null` key
for function invocations, we generate a variable called `<unknown>` which
shouldn't be able to collide with anything.
Fixes#35298.
PR Close#35481
In View Engine, host element of dynamically created component received attributes and classes extracted from component's selector. For example, if component selector is `[attr] .class`, the `attr` attribute and `.class` class will be add to host element. This commit adds similar logic to Ivy, to make sure this behavior is aligned with View Engine.
PR Close#34481
Before this change content queries with the `descendants: false` option, as implemented in ivy,
would not descendinto `<ng-container>` elements. This behaviour was different from the way the
View Engine worked. This change alligns ngIvy and VE behaviours when it comes to queries and the
`<ng-container>` elements and fixes a common bugs where a query target was placed inside the
`<ng-container>` element with a * directive on it.
Before:
```html
<needs-target>
<ng-container *ngIf="condition">
<div #target>...</div> <!-- this node would NOT match -->
</ng-container>
</needs-target>
```
After:
```html
<needs-target>
<ng-container *ngIf="condition">
<div #target>...</div> <!-- this node WILL match -->
</ng-container>
</needs-target>
```
Fixes#34768
PR Close#35384
When the same provider is resolved multiple times on the same node, the first invocation had the correct context, but all subsequent ones were incorrect because we were registering the hook multiple times under different indexes in `destroyHooks`.
Fixes#35167.
PR Close#35249
Currently the logic that handles ICUs located outside of i18n blocks may throw exceptions at runtime. The problem is caused by the fact that we store incorrect TNode index for previous TNode (index that includes HEADER_OFFSET) and do not store a flag whether this TNode is a parent or a sibling node. As a result, the logic that assembles the final output uses incorrect TNodes and in some cases throws exceptions (when incompatible structure is extracted from tView.data due to the incorrect index). This commit adjusts the index and captures whether TNode is a parent to make sure underlying logic manipulates correct TNode.
PR Close#35347
Given:
```
<div class="s1" [class]="null" [ngClass]="exp">
```
Notice that `[class]` binding is not a `string`. As a result the existing logic would not concatenate `[class]` with `class="s1"`. The resulting falsy value would than be sent to `ngClass` which would promptly clear all styles on the `<div>`
The new logic correctly handles falsy values for `[class]` bindings.
Fix#35335
PR Close#35350
In the `loadRenderer` we make an assumption that the value will always be an `LView`, but if there's a directive on the same node which injects `ViewContainerRef` the `LView` will be wrapped in an `LContainer`. These changes add a call to unwrap the value before we try to read the value off of it.
Fixes#35342.
PR Close#35343
Prior to this change, element namespace was not set for host elements of dynamically created components that resulted in incorrect rendering in a browser. This commit adds the logic to pick and set correct namespace for host element when component is created dynamically.
PR Close#35136
Inside `*ngFor` the second run of the styling instructions can get into situation where it tries to read a value from a binding which has not yet executed. As a result the read is `NO_CHANGE` value and subsequent property read cause an exception as it is of wrong type.
Fix#35118
PR Close#35133
This change changes the priority order of static styling.
Current priority:
```
(least priority)
- Static
- Component
- Directives
- Template
- Dynamic Binding
- Component
- Map/Interpolation
- Property
- Directives
- Map/Interpolation
- Property
- Template
- Map/Interpolation
- Property
(highest priority)
```
The issue with the above priority is this use case:
```
<div style="color: red;" directive-which-sets-color-blue>
```
In the above case the directive will win and the resulting color will be `blue`. However a small change of adding interpolation to the example like so. (Style interpolation is coming in https://github.com/angular/angular/pull/34202)
```
<div style="color: red; width: {{exp}}px" directive-which-sets-color-blue>
```
Changes the priority from static binding to interpolated binding which means now the resulting color is `red`. It is very surprising that adding an unrelated interpolation and style can change the `color` which was not changed. To fix that we need to make sure that the static values are associated with priority of the source (directive or template) where they were declared. The new resulting priority is:
```
(least priority)
- Component
- Static
- Map/Interpolation
- Property
- Directives
- Static
- Map/Interpolation
- Property
- Template
- Static
- Map/Interpolation
- Property
(highest priority)
```
PR Close#34938
Previously we would write to class/style as strings `element.className` and `element.style.cssText`. Turns out that approach is good for initial render but not good for updates. Updates using this approach are problematic because we have to check to see if there was an out of bound write to style and than perform reconciliation. This also requires the browser to bring up CSS parser which is expensive.
Another problem with old approach is that we had to queue the DOM writes and flush them twice. Once on element advance instruction and once in `hostBindings`. The double flushing is expensive but it also means that a directive can observe that styles are not yet written (they are written after directive executes.)
The new approach uses `element.classList.add/remove` and `element.style.setProperty/removeProperty` API for updates only (it continues to use `element.className` and `element.style.cssText` for initial render as it is cheaper.) The other change is that the styling changes are applied immediately (no queueing). This means that it is the instruction which computes priority. In some circumstances it may result in intermediate writes which are than overwritten with new value. (This should be rare)
Overall this change deletes most of the previous code and replaces it with new simplified implement. The simplification results in code savings.
PR Close#34804
NOTE: This change must be reverted with previous deletes so that it code remains in build-able state.
This change deletes old styling code and replaces it with a simplified styling algorithm.
The mental model for the new algorithm is:
- Create a linked list of styling bindings in the order of priority. All styling bindings ere executed in compiled order and than a linked list of bindings is created in priority order.
- Flush the style bindings at the end of `advance()` instruction. This implies that there are two flush events. One at the end of template `advance` instruction in the template. Second one at the end of `hostBindings` `advance` instruction when processing host bindings (if any).
- Each binding instructions effectively updates the string to represent the string at that location. Because most of the bindings are additive, this is a cheap strategy in most cases. In rare cases the strategy requires removing tokens from the styling up to this point. (We expect that to be rare case)S Because, the bindings are presorted in the order of priority, it is safe to resume the processing of the concatenated string from the last change binding.
PR Close#34616
This change moves information from instructions to declarative position:
- `ɵɵallocHostVars(vars)` => `DirectiveDef.hostVars`
- `ɵɵelementHostAttrs(attrs)` => `DirectiveDef.hostAttrs`
When merging directives it is necessary to know about `hostVars` and `hostAttrs`. Before this change the information was stored in the `hostBindings` function. This was problematic, because in order to get to the information the `hostBindings` would have to be executed. In order for `hostBindings` to be executed the directives would have to be instantiated. This means that the directive instantiation would happen before we had knowledge about the `hostAttrs` and as a result the directive could observe in the constructor that not all of the `hostAttrs` have been applied. This further complicates the runtime as we have to apply `hostAttrs` in parts over many invocations.
`ɵɵallocHostVars` was unnecessarily complicated because it would have to update the `LView` (and Blueprint) while existing directives are already executing. By moving it out of `hostBindings` function we can access it statically and we can create correct `LView` (and Blueprint) in a single pass.
This change only changes how the instructions are generated, but does not change the runtime much. (We cheat by emulating the old behavior by calling `ɵɵallocHostVars` and `ɵɵelementHostAttrs`) Subsequent change will refactor the runtime to take advantage of the static information.
PR Close#34683
Fixes Ivy detecting changes inside child embedded views, even though they're detached.
Note that there's on subtlety here: I made the changes inside `refreshDynamicEmbeddedViews` rather than `refreshView`, because we support detecting changes on a detached view (evidenced by a couple of unit tests), but only if it's triggered directly from the view's `ChangeDetectorRef`, however we shouldn't be detecting changes in the detached child view when something happens in the parent.
Fixes#34816.
PR Close#34846
The major one that affects the angular repo is the removal of the bootstrap attribute in nodejs_binary, nodejs_test and jasmine_node_test in favor of using templated_args --node_options=--require=/path/to/script. The side-effect of this is that the bootstrap script does not get the require.resolve patches with explicitly loading the targets _loader.js file.
PR Close#34736
Currently ngtsc looks for the first `ConstructorDeclaration` when figuring out what the parameters are so that it can generate the DI instructions. The problem is that if a constructor has overloads, it'll have several `ConstructorDeclaration` members with a different number of parameters. These changes tweak the logic so it looks for the constructor implementation.
PR Close#34590
Unlike in View Engine, we currently reset the dirty state of
components in the check no changes change detection cycle.
This means that components cannot be marked as dirty from
view lifecycle hooks because the dirty state is reset and
the lifecycle hooks do not run in the check no changes CD cycle.
PR Close#34495
The major one that affects the angular repo is the removal of the bootstrap attribute in nodejs_binary, nodejs_test and jasmine_node_test in favor of using templated_args --node_options=--require=/path/to/script. The side-effect of this is that the bootstrap script does not get the require.resolve patches with explicitly loading the targets _loader.js file.
PR Close#34589
This commit improves `ExpressionChangedAfterChecked` error message for attributes by including attribute name and the content of the entire expression that contains interpolation(s). In order to achieve that, metadata is now stored in `TData` array when `attribute` and `attributeInterpolate` instructions are being called (similar to `property` and `propertyInterpolate` instructions).
PR Close#34505
Fixes classes with trailing or leading space that are passed to `ngClass` (e.g. `{'foo ': bar}`) not being applied in Ivy. The issue comes from the fact that when the styling differ builds up the style map it uses the trimmed key to look up the value in the map that uses non-trimmed keys.
Fixes#34476.
PR Close#34539
Follow-up from [this discussion](https://github.com/angular/angular/pull/33419#discussion_r339296216). In Ivy we don't use the schema to validate tag names, but instead we use feature detection to figure out whether an element is supported. While this should generally be more accurate, it'll also end up throwing for some more innocent cases. E.g. now Ivy throws an error for `main` elements in IE which is accurate since IE doesn't support the element, but is annoying since there is no functionality attached.
These changes switch to logging a warning instead, similarly to what we're doing for unknown properties.
PR Close#34524
The `getProjectAsAttrValue` in `node_selector_matcher` finds the
ProjectAs marker and then additionally checks that the marker appears in
an even index of the node attributes because "attribute names are stored
at even indexes". This is true for "regular" attribute bindings but
classes, styles, bindings, templates, and i18n do not necessarily follow
this rule because there can be an uneven number of them, causing the
next "special" attribute "name" to appear at an odd index. To address
this issue, ensure ngProjectAs is placed right after "regular"
attributes.
PR Close#34617
Prior to this commit, there were no `advance` instructions generated before `i18nExp` instructions and as a result, lifecycle hooks for components used inside i18n blocks were flushed too late. This commit adds the logic to generate `advance` instructions in front of `i18nExp` ones (similar to what we have in other places like interpolations, property bindings, etc), so that the necessary lifecycle hooks are flushed before expression value is captured.
PR Close#34436
The main logic of the `InheritDefinitionFeature` is to go through the prototype chain of a given Component and merge all Angular-specific information onto that Component def. The problem happens in case there is a Component in a hierarchy that also contains the `InheritDefinitionFeature` (i.e. it extends some other Component), so it inherits all Angular-specific information from its super class. As a result, the root Component may end up having duplicate information inherited from different Components in hierarchy.
Let's consider the following structure: `GrandChild` extends `Child` that extends `Base` and the `Base` class has a `HostListener`. In this scenario `GrandChild` and `Child` will have `InheritDefinitionFeature` included into the `features` list. The processing will happend in the following order:
- `Child` inherits `HostListener` from the `Base` class
- `GrandChild` inherits `HostListener` from the `Child` class
- since `Child` has a parent, `GrandChild` also inherits from the `Base` class
The result is that the `GrandChild` def has duplicated host listener, which is not correct.
This commit introduces additional logic that checks whether we came across a def that has `InheritDefinitionFeature` feature (which means that this def already inherited information from its super classes). If that's the case, we skip further fields-related inheritance logic, but keep going though the prototype chain to look for super classes that contain other features (like NgOnChanges), that we need to invoke for a given Component def.
PR Close#34244
Prior to this change, the ExpressionChangedAfterChecked error thrown in Ivy was missing useful information that was available in View Engine, specifically: missing property name for proprty bindings and also the content of the entire property interpolation (only a changed value was displayed) if one of expressions was changed unexpectedly. This commit improves the error message by including the mentioned information into the error text.
PR Close#34381
The ordering matters because we don't currently throw if multiple
configurations are provided (i.e. provider has *both* useExisting and
useFactory). We should actually throw an error in this case, but to
avoid another breaking change in v9, this PR simply aligns the Ivy
behavior with ViewEngine.
PR Close#34433
Currently we only run Saucelabs on PRs using the legacy View Engine
build. Switching that build to Ivy is not trivial and there are various
options:
1. Updating the R3 switches to use POST_R3 by default. At first glance,
this doesn't look easy because the current ngtsc switch logic seems to
be unidirectional (only PRE_R3 to POST_R3).
2. Updating the legacy setup to run with Ivy. This sounds like the easiest
solution at first.. but it turns out to be way more complicated. Packages
would need to be built with ngtsc using legacy tools (i.e. first building
the compiler-cli; and then building packages) and View Engine only tests
would need to be determined and filtered out. Basically it will result in
re-auditing all test targets. This is contradictory to the fact that we have
this information in Bazel already.
3. Creating a new job that runs tests on Saucelabs with Bazel. We specify
fine-grained test targets that should run. This would be a good start
(e.g. acceptance tests) and also would mean that we do not continue maintaining
the legacy setup..
This commit implements the third option as it allows us to move forward
with the general Bazel migration. We don't want to spend too much time
on our legacy setup since it will be removed anyway in the future.
PR Close#34277
We've got some tests that assert that the generate DOM looks correct. The problem is that IE changes the attribute order in `innerHTML` which caused the tests to fail. I've reworked the relevant tests not to assert directly against `innerHTML`.
PR Close#34305
Prior to this commit, values wrapped into SafeStyle were not handled correctly in [style.prop] bindings in case style sanitizer is present (when template contains some style props that require sanitization). Style sanitizer was not unwrapping values in case a given prop doesn't require sanitization.As a result, wrapped values were used as final styling values (see https://github.com/angular/angular/blob/master/packages/core/src/render3/styling/bindings.ts#L620). This commit updates the logic to unwrap safe values in sanitizer in case no sanitization is required.
PR Close#34286
Prior to this commit, calling change detection for destroyed views resulted in errors being thrown in some cases. This commit adds a check to make sure change detection is invoked for non-destroyed views only.
PR Close#34241
Prior to this commit, if a template (for example, generated using structural directive such as *ngIf) contains `ngProjectAs` attribute, it was not included into attributes array in generated code and as a result, these templates were not matched at runtime during content projection. This commit adds the logic to append `ngProjectAs` values into corresponding element's attribute arrays, so content projection works as expected.
PR Close#34200
Prior to this commit, i18n runtime code failed with the exception saying that no provider was found for ChangeDetectorRef for a pipe used in ICU. The problem happened because the underlying `createViewRef` function was not taking into account IcuContainer as a valid TNodeType. This commit updates the `createViewRef` function to return corresponding ViewRef for TNodeType.IcuContainer.
PR Close#34198
Fixes ngtsc incorrectly logging an unknown element diagnostic for HTML elements that are inside an SVG `foreignObject` with the `xhtml` namespace.
Fixes#34171.
PR Close#34178
Prior to this commit, the unknown element can happen twice for AOT-compiled components: once during compilation and once again at runtime. Due to the fact that `schemas` information is not present on Component and NgModule defs after AOT compilation, the second check (at runtime) may fail, even though the same check was successful at compile time. This commit updates the code to avoid the second check for AOT-compiled components by checking whether `schemas` information is present in a logic that executes the unknown element check.
PR Close#34024
Prior to this commit, there was a runtime check in i18n logic to make sure "other" case is always present in an ICU. That was not a requirement in View Engine, so ICUs that previously worked may produce errors. This commit removes that restriction and adds support for ICUs without "other" cases.
PR Close#34042
When inserting a `viewRef` it is possible to not provide
an `index`, which is regarded as appending to the end of
the container.
If the `viewRef` already exists in the container, then
this results in a move. But there was a fault in the logic
that computed where to insert the `viewRef` that did not
account for the fact that the `viewRef` was already in
the container, so the insertion `index` was outside the
bounds of the array.
Fixes#33924
PR Close#34052
Prior to this commit, all styles extracted from Component's template (defined using <style> tags) were ignored by JIT compiler, so only `styles` array values defined in @Component decorator were used. This change updates JIT compiler to take styles extracted from the template into account. It also ensures correct order where `styles` array values are applied first and template styles are applied second.
PR Close#34017
This commit fixes a compatibility bug where pre-order lifecycle
hooks (onInit, doCheck, OnChanges) for directives on the same
host node were executed based on the order the directives were
matched, rather than the order the directives were instantiated
(i.e. injection order).
This discrepancy can cause issues with forms, where it is common
to inject NgControl and try to extract its control property in
ngOnInit. As the NgControl directive is injected, it should be
instantiated before the control value accessor directive (and
thus its hooks should run first). This ensures that the NgControl
ngOnInit can set up the form control before the ngOnInit
for the control value accessor tries to access it.
Closes#32522
PR Close#34026
The assertion that we have in the `directiveInject` instruction is too restrictive and we came across some pattern where it throws unnecessarily. This commit removes that assertion for now and more detailed investigation is needed to decide is we need to restrict the set of TNodeType again.
This commit also adds a test which triggered the TNodeType.View to come up in the `directiveInject` instruction, so it might be useful to avoid regressions during further refactoring.
PR Close#33948
When asking for a ViewContainerRef on <ng-container> we do reuse <ng-container> comment
node as a LContainer's anachor. Before this fix the act of re-using a <ng-container>'s
comment node would result in this comment node being re-appended to the DOM in the wrong
place. With the fix in this PR we make sure that re-using <ng-container>'s comment node
doesn't result in unwanted DOM manipulation (ng-gontainer's comment node is already part
of the DOM and doesn't have to be re-created / re-appended).
PR Close#33816
Prior to this commit the assert that we have in `directiveInject` (assert introduced recently) didn't include IcuContainer TNode type and as a result, the error is thrown in case pipes with dependencies are used inside ICUs. This commit extends the assert to allow for IcuContainer TNode types.
PR Close#33832
Currently if a consumer does something like the following, the object literal will be shared across the two elements and any instances of the component template. The same applies to array literals:
```
<div [someDirective]="{}"></div>
<div [someDirective]="{}"></div>
```
These changes make it so that we generate a pure function even if an object is constant so that each instance gets its own object.
Note that the original design for this fix included moving the pure function factories into the `consts` array. In the process of doing so I realized that pure function are also used inside of directive host bindings which means that we don't have access to the `consts`.
These changes also:
* Fix an issue that meant that the `pureFunction0` instruction could only be run during creation mode.
* Make the `getConstant` utility slightly more convenient to use. This isn't strictly required for these changes to work, but I had made it as a part of a larger refactor that I ended up reverting.
PR Close#33705
This is a breaking change in nodejs rules 0.40.0 as part of the API review & cleanup for the 1.0 release. Their APIs are identical as ts_web_test was just karma_web_test without the config_file attribute.
PR Close#33802
Prior to this change, setting style prop value to undefined or empty string would not result in resetting prop value in case the style prop is defined using [style.prop.px] syntax. The problem is that the check for empty value (and thus reseting the value) considered successful only in case of `null` value. This commit updates the check to use `isStylingValueDefined` function that also checks for undefined and empty string.
PR Close#33780
Prior to this change, ComponentFactory.create function invocation in Ivy retained the content of the host element (in case host element reference or CSS seelctor is provided as an argument). This behavior is different in View Engine, where the content of the host element was cleared, except for the case when ShadowDom encapsulation is used (to make sure native slot projection works). This commit aligns Ivy and View Engine and makes sure the host element is cleared before component content insertion.
PR Close#33487
Prior to this change, namespaced elements such as SVG elements would not
participate correctly in directive matching as their namespace was not
ignored, which was the case with the View Engine compiler. This led to
incorrect behavior at runtime and template type checking.
This commit resolved the issue by ignoring the namespace of elements and
attributes like they were in View Engine.
Fixes#32061
PR Close#33555
When debugging `LView`s it is easy to get lost since all of them have
the same name. This change does three things:
1. It makes `TView` have an explicit type:
- `Host`: for the top level `TView` for bootstrap
- `Component`: for the `TView` which represents components template
- `Embedded`: for the `TView` which represents an embedded template
2. It changes the name of `LView` to `LHostView`, `LComponentView`, and
`LEmbeddedView` depending on the `TView` type.
3. For `LComponentView` and `LEmbeddedView` we also append the name of
of the `context` constructor. The result is that we have `LView`s which
are name as: `LComponentView_MyComponent` and `LEmbeddedView_NgIfContext`.
The above changes will make it easier to understand the structure of the
application when debugging.
NOTE: All of these are behind `ngDevMode` and will get removed in
production application.
PR Close#33449
Prior to this commit, i18n runtime logic used `elementAttributeInternal` function (that uses `setAttribute` function under the hood) for all elements where i18n attributes are present. However the `<ng-container>` elements in a template may also have i18n attributes and calling `setAttribute` fails, since they are represented as comment nodes in DOM. This commit ensures that we call `setAttribute` on nodes with TNodeType.Element type (that support that operation) only.
PR Close#33599
This patch introduces a `firstUpdatePass` flag which can be used inside
of instruction code to determine if this is the first time each
instruction is running inside of the update block of a template or
a hostBindings function.
PR Close#31270
In ViewEngine we used to throw an error if we encountered an unknown element while rendering. We have this already for Ivy in AoT, but we didn't in JiT. These changes implement the error for JiT mode.
PR Close#33419
Prior to this commit, i18n logic which ensures that elements removed in a translation are also removed in DOM, didn't take into account the fact that elements may have local refs. As a result, remove operation failed, since there is no corresponding tNode found. This commit updates the logic to skip all local refs while going though the list of nodes to ensure that DOM matches elements present in translation.
PR Close#33415
`bindingIndex` stores the current location of the bindings in the
template function. Because it used to be stored in `LView` that `LView`
was not reentrant. This could happen if a binding was a getter and had
a side-effect of calling `detectChanges()`.
By moving the `bindingIndex` to `LFrame` where all of the global state
is kept in reentrant way we correct the issue.
PR Close#33235
Removes `ngBaseDef` from the compiler and any runtime code that was still referring to it. In the cases where we'd previously generate a base def we now generate a definition for an abstract directive.
PR Close#33264
This commit adds CopyDefinitionFeature, which supports the case where an
entire decorator (@Component or @Directive) is inherited from parent to
child.
The existing inheritance feature, InheritDefinitionFeature, supports merging
of parent and child definitions when both were originally present. This
merges things like inputs, outputs, host bindings, etc.
CopyDefinitionFeature, on the other hand, compensates for a definition that
was missing entirely on the child class, by copying fields that aren't
ordinarily inherited (like the template function itself).
This feature is intended to only be used as part of ngcc code generation.
PR Close#33362
Miško Hevery
Andrew Kushnir
crisbeto
zhuyujie
Pawel Kozlowski
Andrew Scott
Greg Magolan
Paul Gschwendtner
atscott
Pete Bacon Darwin
Kara Erickson
horn
JoostK
JiaLiPassion
Matias Niemelä
Alex Rickabaugh