Define global constants
<p>In Angular 1.x you can define constants like this:</p>

<pre class="lang-js prettyprint-override"><code>angular.module('mainApp.config', [])
    .constant('API_ENDPOINT', 'http://127.0.0.1:6666/api/')
</code></pre>

<p>What would be the equivalent in Angular (with TypeScript)?</p>

<p>I just don't want to repeat the API base url over and over again in all my services.</p>