How to use the esri-loader.loadScript function in esri-loader

public async canLoad(
        route: Route,
        segments: UrlSegment[]
    ): Promise {
        if (isLoaded()) {
            return true;
        }
        try {
            const options = this.getOptions();
            // load esri script and dojoConfig;
            await loadScript(options);
            // add cors enabled hosts
            const [config] = await loadModules(['esri/config']);
            for (const server of environment.trustedServers) {
                config.request.trustedServers.push(server);
            }
            return true;
        }
        catch (ex) {
            console.error(ex);
            return false;
        }
    }

loadScript (options) {
    return esriLoader.loadScript(options)
    .then(script => {
      // have to wrap this async side effect in Ember.run() so tests don't fail
      // may be able to remove this once we can have esriLoader use RSVP.Promise
      run(() => {
        // update the isLoaded computed property
        this.notifyPropertyChange('isLoaded');
        return script;
      });
    });
  },

load(options?: ILoadScriptOptions): Promise {
    this.loadScriptOptions = options ? options : {};
    return loadScript(options);
  }