interface ComposedContext {
$implicit: any;
templateRefs: TemplateRef<ComposedContext>[];
[key: string]: any;
}
<ng-template #pluck let-object>
<ng-container *return="object.hello"></ng-container>
</ng-template>
<ng-container *compose="let hello of [ pluck ] use { hello: 'World!' }">
{{ hello }} // World!
</ng-container>
