JAVASCRIPT

bootstrap 4 navbar-collapse not working angular

<button class="navbar-toggler" type="button" (click)="navbarCollapsed = !navbarCollapsed" [attr.aria-expanded]="!navbarCollapsed" aria-controls="navbarContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
</button>

angular navbar expand not working

<!-----------------------------HTML-------------------------------->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
  <div class="container">
      <div class="navbar-brand">
          <a href="home">
              <i class="bi bi-bootstrap-fill"></i>
          </a>
      </div>
      <button type="button" class="navbar-toggler" (click)="isCollapsed = !isCollapsed">
          <span class="navbar-toggler-icon"></span>
      </button>
    <div class="collapse navbar-collapse" [ngbCollapse]="isCollapsed">
      ....
    </div>
  </div>
</nav>

<!-----------------------------typescript-------------------------------->

isCollapsed : boolean = false;

bootstrap 4 navbar-collapse not working angular

<div class="collapse navbar-collapse" [ngbCollapse]="navbarCollapsed" id="navbarSupportedContent">