Empty value on production build

[webmatrixxxl]

Hello. I'm trying to get selector value and use it in my component class, but on production annotations[0].selector is empty.

import { Directive, ElementRef, AfterContentInit } from '@angular/core';

@Directive({
  selector: '[appLinkedCheckbox]'
})
export class LinkedCheckboxDirective implements AfterContentInit {
  private el: HTMLElement;

  constructor(el: ElementRef) {
    this.el = el.nativeElement;
  }

  public ngAfterContentInit() {
    let annotations = Reflect.getMetadata('annotations', this.constructor);
    let selector    = annotations[0].selector;  // This value is empty on production build
  }
}

@angular/cli: 1.0.0-rc.0
node: 7.7.4
os: darwin x64
@angular/common: 2.4.10
@angular/compiler: 2.4.10
@angular/core: 2.4.10
@angular/forms: 2.4.10
@angular/http: 2.4.10
@angular/platform-browser: 2.4.10
@angular/platform-browser-dynamic: 2.4.10
@angular/platform-server: 2.4.10
@angular/router: 3.4.10
@angular/compiler-cli: 2.4.10
@angular/cli: 1.0.0-rc.0