javascript - Bootstrap4 navbar always collapsed -

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for reason, exact same code have started working differently once updated angular... here navbar code 

<nav *ngif="authservice.isloggedin" class="navbar navbar-toggleable-md navbar-light bg-faded"> <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsupportedcontent" aria-controls="navbarsupportedcontent" aria-expanded="false" aria-label="toggle navigation">     <span class="navbar-toggler-icon"></span> </button> <a class="navbar-brand" routerlink="home">mavis</a>  <div class="collapse navbar-collapse" id="navbarsupportedcontent">     <ul class="navbar-nav mr-auto">         <li class="nav-item" *ngif="authservice.isadmin">             <a class="nav-link" routerlink="settings">settings</a>         </li>         <li class="nav-item">             <a class="nav-link" routerlink="home">home</a>         </li>         <li class="nav-item">             <a class="nav-link" routerlink="session">session</a>         </li>     </ul>     <div class="nav navbar-nav navbar-right">         <button (click)="logout()" class="navbar-brand"><strong>logout</strong></button>     </div> </div>

problem navbar collapsed, regardless of width of screen, looks great on phone, not on desktop. i'm sure setup bootstrap angular 2 project properly.. sure, added these 'angular-cli.json' file

"styles": [     "../node_modules/bootstrap/dist/css/bootstrap.min.css",     "styles.css"   ],   "scripts": [     "../node_modules/jquery/dist/jquery.js",     "../node_modules/tether/dist/js/tether.js",     "../node_modules/popper.js/dist/umd/popper.js",     "../node_modules/bootstrap/dist/js/bootstrap.js"   ],





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