feat(core): add API to inject attributes on the host node #54604
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jessicajaniuk
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Angular has the `@Attribute` decorator that allows for attributes to be injected from the host node, but we don't have an equivalent for the `inject` function. These changes introduce the new `HostAttributeToken` class that can be used to inject attributes similarly to `@Attribute`. It can be used as follows:
```typescript
import {HostAttributeToken, inject} from '@angular/core';
class MyDir {
someAttr = inject(new HostAttributeToken('some-attr'));
}
```
The new API works similarly to `@Attribute` with one key exception: it will throw a DI error when the attribute doesn't exist, instead of returning `null` like `@Attribute`. We made this change to align its behavior closer to other injection tokens.
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Angular has the
@Attributedecorator that allows for attributes to be injected from the host node, but we don't have an equivalent for theinjectfunction. These changes introduce the newHostAttributeTokenclass that can be used to inject attributes similarly to@Attribute. It can be used as follows:The new API works similarly to
@Attributewith one key exception: it will throw a DI error when the attribute doesn't exist, instead of returningnulllike@Attribute. We made this change to align its behavior closer to other injection tokens.