twitter bootstrap - Aurelia tutorial collapsible navbar not working -

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i'm following aurelia tutorial , i've noticed bootstrap collapsible navbar isn't working @ all. i've found someone's heroku app online exact same problem.

here's source

<template> <require from="bootstrap/css/bootstrap.css"></require> <require from="font-awesome/css/font-awesome.css"></require> <nav class="navbar navbar-default navbar-fixed-top" role="navigation">     <div class="navbar-header">         <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#example-navbar-collapse">             <span class="sr-only">toggle navigation</span>             <span class="icon-bar"></span>             <span class="icon-bar"></span>             <span class="icon-bar"></span>         </button>         <a class="navbar-brand" href="#">             <i class="fa fa-home"></i>             <span>${router.title}</span>         </a>     </div>     <div class="collapse navbar-collapse" id="example-navbar-collapse">         <ul class="nav navbar-nav">             <li repeat.for="row of router.navigation" class="${row.isactive ? 'active' : ''}">                 <a href.bind="row.href">${row.title}</a>             </li>         </ul>         <ul class="nav navbar-nav navbar-right">             <li class="loader" if.bind="router.isnavigating">                 <i class="fa fa-spinner fa-spin fa-2x"></i>             </li>         </ul>     </div> </nav> <div class="page-host">     <router-view></router-view> </div>

any idea going on this?

make sure you're including bootstrap library in application.

app.js

import 'bootstrap/js/bootstrap.min'; // or wherever

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