This gist demonstrates how the router.navigation property in the navigation.ts view does not work as expected when the router property type on the app.ts viewModel is set to any.

app.html

<template>
  <require from="bootstrap/css/bootstrap.css"></require>
  <require from="./header"></require>
  <require from="./navigation"></require>
  <div style="margin-top: 60px;">
    <navigation></navigation>
    <div id="master" style="margin-left:250px;padding-left:10px;border-left: 1px solid #000000;">
      <div class="alert alert-success" role="alert"><b>Well done!</b> You successfully read this important alert message.</div>
      <header></header>
      <router-view></router-view>
    </div>
    <div class="clear" style="clear:both;"></div>
  </div>
</template>

app.ts

import {Router} from 'aurelia-router';

export class App {
  router: Router; /* change the type of this variable to any and it won't work in navigation.ts */
  configureRouter(config, router){
    config.title = "Aurelia";
    config.options.root = '/';
    config.map([
      { route: ["", "login"], name: "login", moduleId: "login", nav: false},
      { route: "batch/overview", name: "overview", moduleId: "overview", title: "Übersicht", nav: true},
      { route: "batch/completed-jobs", name: "completed-jobs", moduleId: "completed-jobs", title: "Abgeschlossene Jobs", nav: true},
      { route: "batch/job-definitions", name: "job-definitions", moduleId: "job-definitions", title: "Job Definitionen", nav: true},
    ]);
    this.router = router;
  }
}

navigation.html

<template>
    <div id="navigation" style="width:250px;float:left;padding-left:10px;padding-right:5px;">
      <ul class="nav nav-pills nav-stacked">
        <li role="presentation" repeat.for="row of router.navigation" class="${row.isActive ? 'active' : ''}"><a href="${row.href}">${row.title}</a></li>
      </ul>
    </div>
</template>

navigation.ts

import {inject} from 'aurelia-framework';
import {Router} from 'aurelia-router';

@inject(Router)
export class Navigation {
  constructor(private router: Router){
  }
}