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@Component({
  selector: 'searchable-container',
  template: `
    <ng-content></ng-content>
  `
})
export class SearchableContainerComponent {
  private searchables: SearchableDirective[] = [];
  private searchablesHighlight: SearchableHighlightDirective[] = [];

  ...

  search(searchTerm: string) {
    this.handleSearchables(searchTerm);
    this.handleHighlighters(searchTerm);
  }

  register(searchable, { highlight }) {
    // add the instance
  }

  unregister(searchable, { highlight }) {
    // remove the instance
  }

  ngAfterContentInit() {
    this.search(this.term);
  }

  private match(searchable: SearchableDirective) {
    return searchable.token.toLowerCase().indexOf(this._term.toLowerCase()) > -1;
  }

  private handleSearchables(searchTerm: string) {
    ..same
  }

  private handleHighlighters(searchTerm: string) {
    for (const searchableHighlight of this.searchablesHighlight) {
      searchableHighlight.highlight(searchableHighlight.token, searchTerm);
    }
  }
}