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https://github.com/angular/angular
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This is the compile-time implementation of the `hostDirectives` feature plus a little bit of runtime code to illustrate how the newly-generated code will plug into the runtime. It works by creating a call to the new `ɵɵHostDirectivesFeature` feature whenever a directive has a `hostDirectives` field. Afterwards `ɵɵHostDirectivesFeature` will patch a new function onto the directive definition that will be invoked during directive matching.
For example, if we take the following definition:
```ts
@Directive({
hostDirectives: [HostA, {directive: HostB, inputs: ['input: alias']}]
})
class MyDir {}
```
Will compile to:
```js
MyDir.ɵdir = ɵɵdefineComponent({
features: [ɵɵHostDirectivesFeature([HostA, {
directive: HostB,
inputs: {
input: "alias"
}
}])]
});
```
The template type checking is implemented during directive matching by adding the host directives applied on the host to the array of matched directives whenever the host is matched in a template.
Relates to #8785.
PR Close #46868
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|---|---|---|
| .. | ||
| util | ||
| view | ||
| BUILD.bazel | ||
| r3_ast_absolute_span_spec.ts | ||
| r3_ast_spans_spec.ts | ||
| r3_template_transform_spec.ts | ||
| README.md | ||
| style_parser_spec.ts | ||
Tests in this directory are excluded from running in the browser and only run in node.