Identity Server: Introduction

In the SPA based sample applications, this blog has used so far user authentication has either been completely ignored in order to keep the examples simpler or the sites have used ASP.NET Core’s built in identity to encapsulate the whole SPA. In this post (or series of posts) I am going to share what I learn along the way of creating an Angular (2+) application that utilizes ASP.NET Core as its host/API/backend.

This post isn’t going to cover any code it is just going to be a lot of the information I gathered in the process of learning more about Identity Server.

Identity Server

According to their docs IdentityServer4 is an OpenID Connect and OAuth 2.0 framework for ASP.NET Core which enables Authentication as a Service, Single Sign-on, API Access Control and a Federation Gateway.

Obviously, that covers a lot of scenarios. The two that I am interested in are Authentication as a Service and the API Access Control which has driven my research which means that the other aspects of IdentityServer4 will not be included.

Official Samples

The IdentityServer GitHub account has a samples repo that contains a ton of examples. I have found the quickstart area of the repo to be the most helpful when starting out.

Based on all the quickstarts samples it looks like a typical setup involves a minimum of three projects. One for the API, one for the client and one for Identity Server. As you go through the samples the number of projects increase, but that is because of a wider range of scenarios that the sample is trying to cover.

References for learning

Damienbod has a whole series of blog posts related to IdentityServer4 and code to go along with it which can be found here. As a side note if you are interested in ASP.NET Core and you aren’t following damienbo you should be he has a ton of great content.

Blog posts

Identity Server Alternatives

Identity Server isn’t the only way to go there is a number of Software as a Service options that cover a lot of same scenarios. The following are some examples.

Auth0 – Check out the .NET Core related blogs by Jerrie Pelser
Amazon Cognito

Wrapping up

Obviously, I didn’t get a lot covered on how to actually do something with IdentityServer, but I wanted to share my starting point. This is an area I am going to continue digging it to and sharing information about as I learn more.

If you have any resources in this area please leave a comment below.

Upgrading a JavaScript Services Application

As part of the ASP.NET Core Basics series of posts, JavaScript Services was used to create a couple of front end for a basic contacts API using Aurelia and Angular 2. Theses applications were created a few months ago and JavaScript Services has kept moving since then. This post is going to look at one strategy for taking an application created on an older version of JavaScript Services and update it to match the current version. This post will be following the upgrade of the Angular project from ASP.NET Core Basics repo with the starting point of the code being from this release.

The strategy

One of the considerations when doing this upgrade was getting the changes that happen on the ASP.NET Core side of the application and not just the JavaScript bits. In order to make sure that nothing was missed I decided to use JavaScript Services to generate a new application and use that to compare with the implementations in the existing application.

Create comparison application

This is going to assume JavaScript Services is already installed. If it isn’t this page has instructions or this post has sections that deal with creating a new application using JavaScript Services.

The update

Following is the files that changed during this update. This is also the list of files I would check anytime an upgrade needs to be done.

There were a fair amount of changes in the files listed above and instead of posting the code the differences can be found here. The previous diff didn’t contain the webpack.config files and those diffs can be found here and here.

After all the files have been updated make sure to run the following command from a command prompt in your project directory to make sure webpack has vendor related items regenerated.

Wrapping up

This post is a lighter on the details that I do most of the time, but this type of upgrade would just have been a wall of code and not been overly useful and the commits on GitHub are a much better guide to what the upgrade looked like. My feeling is that over time the number of changes going forward may end up being smaller and easier to integrate.

Both the Aurelia and Angular projects have been upgraded and the final version of the code can be found here.

Aurelia with JavaScriptServices: Call to Node module failed

This is going to be a quick post on how to solve an error I go on a new Aurelia project created using JavaScriptServices. For a walk though of creating a project using JavaScripServices check out this post.

The problem

The project got created and would build with no issues, but when I tried to run it I got the following error.

Call to Node module failed with error: Error: Cannot find module ‘./wwwroot/dist/vendor-manifest.json’

The fix

After a little bit of searching I came across this issue on the JavaScriptServices repo with the same error. One of the comments on the issue suggested running the following command from a command prompt in the same directory as your project.

After running that command everything worked like a charm! It is worth noting that the command above can be found in project.json in the scripts prepublish section. From the little bit of reading I did it looks like this command should be rerun anytime a new vendor dependency is added.


I can’t get over how awesome JavaScriptServies is. Steve Sanderson (and team) have done an amazing job. Even with this little hiccup I got this new project up and running 10 times faster than I would have otherwise. It is also going to give me a push to look into webpack.

Angular 2 with ASP.NET Core using JavaScriptServices

This was going to be the fist in a series of posts covering getting started using the RTM versions of ASP.NET Core and Angular 2 together which was going to follow a similar path as the series on Aurelia and ASP.NET Core the first entry of which can be found here.

In the process of writing this post I was reminded of JavaScripServices (they recently added Aurelia support!) and will be using it to get this project up and running instead of doing the work manually.

The code found here can be used as a starting point. The repo contains a solutions with an ASP.NET Core API (Contacts) project and a MCV 6 (Aurelia) project. This post will be add a new MVC 6 project for Angular 2.

JavaScriptServices introduction

JavaScriptServices is an open source project by Microsoft for ASP.NET Core developers to quickly get up and running with one of many JavaScript front ends. The following is their own description.

JavaScriptServices is a set of technologies for ASP.NET Core developers. It provides infrastructure that you’ll find useful if you use Angular 2 / React / Knockout / etc. on the client, or if you build your client-side resources using Webpack, or otherwise want to execute JavaScript on the server at runtime.

The great thing about using the generator that JavaScriptServcies provides is they handle the integration between all the different tools which can be challenging to get right on your own without a lot of time and research.

Project creation

First step is to install the Yeomen generator via npm using the following command from a command prompt.

When installation is complete create a new directory call Angular for the project. In the context of the repo linked above this new directory would be in Contact/src at the same level as the Aurelia and Contacts folders.

Open a command prompt and navigate to the newly created directory and run the following command to kick off the generation process.

This will present you will a list of frameworks to choose from. We are going with Angular 2, but Aurelia, Knockout, React and React with Redux are also available.


Hit enter and it will ask for a project name which gets defaulted to the directory name so just hit enter again unless you want to use a different name. This kicks off the project creation which will take a couple of minutes to complete.

Add new project to existing solution

To include the new Angular project in an existing solution right click on the src folder in the Solution Explorer and select Add > Existing Project.


This shows the open file dialog. Navigate to the directory for the new Angular project and select the Angular project file.


Wrapping up

Set the Angular project as the start up project and hit run and you will find yourself in a fully functional Angular 2 application. It is amazing how simple JavaScriptServices makes getting started with a new project.

The tool setup seems to be one of the biggest pain points with any SPA type JavaScript framework. Aurelia is a little friendlier to ASP.NET Core out of the box than Angular 2, but it still isn’t the simplest process ever. JavaScriptServices is one of those thing I wish I had tried out sooner.

In the near future I am going to redo the Aurelia project in this solution using JavaScriptServices. From there I will come back to the Angular project created in this post and integrate it with the Contact API used in the existing Aurelia application.

Completed code for this post can be found here.

Upgrading to npm 3 or 4

As part of writing a post on getting Angular 2 working with ASP.NET Core I needed to upgrade to npm verson 3. All went well on my main machine, but when I tried it on my laptop things didn’t go so well. No matter how many times I ran  npm install -g npm the version returned via  npm -v always returned 1.4.9.

After a bit of googling I came across this post on Stack Overflow. The post also points to npm’s github wiki on the upgrade process which can be found here. I am going to go over the option that I used to get my laptop upgraded.

Open an administrator command prompt and navigate to the install directory for nodejs. This should be either  C:\Program Files (x86)\nodejs or  C:\Program Files\nodejs and then run  npm install npm@latest.

Now if you run  npm -v you should see a 3.x version of npm.

npm 4

Since writing this npm 4 has come out. The above should still apply if you find that npm is stuck as a previous version. Check out the npm release notes page for details.

Aurelia with ASP.NET Core: Host Aurelia from a Controller

This is the forth entry in a series using Aurelia and ASP.NET Core together. Each post builds on the previous and all the code is available on Github.

Part 1 – Add Aurelia to an ASP.NET Core Project
Part 2 – Aurelia with an ASP.NET Core API
Part 3 – Aurelia with an ASP.NET Core API: Modeling and Displaying Data in Aurelia
Part 4 – Aurelia with ASP.NET Core: Host Aurelia from a Controller (this post)
Github repo with the code for all of the parts with a release to go with each post

The goal

So far the Aurelia application in this series has existed outside of the the ASP.NET Core application. This post is going move the Aurelia application to be hosted by a MVC controller and a razor view. This would allow an existing application to slowly be ported to Aurelia or allow portions of an application to be replaced by Aurelia as it made sense, etc.

The controller

The controller isn’t going to be doing much other than returning a view that contains the entry point for the Aurelia application. This example will be using a new Aurelia  action on the  HomeController.

The view

Next create a view in the Views/Home folder named  Aurelia.cshtml to match the name of the action added to the  HomeController above. Right click on the Home folder and select Add > New Item.


This will show the Add New Item dialog. Using the search in the upper right corner serach for MVC and select MVC View Page. Enter Aurelia.cshtml as the name and click Add.

Enter the following in the newly created file.

This code defines a div that will host an Aurelia application named main.

Add a link to the Aurelia application

Inside of the Views/Shared folder open _Layout.cshtml which is where the MVC application’s navigation bar is defined. Locate the navigation bar code and add a list item and link that points to the  HomeController  Aurelia action defined above. The following is the full navigation bar for the MVC application including the new link for Aurelia.

Adjust Aurelia’s baseUrl

Finally inside the aurelia_project folder open  aurelia.json and adjust the  baseUrl property inside the  targets section to look for the scripts folder to be up one directory. This is required now with the Aurelia application being hosted inside the  HomeController which will cause the Aurelia application to look for its scripts in the Home/Scripts folder instead of the site’s main scripts folder. If you are going to have multiple Aurelia applications per MVC application then you may need to take a different path on this section.

Wrap up

Run the application and click the Aurelia link in the navigation bar and the Aurelia application from last week will run, but now it will still have the navigation bar from the MVC application showing. The  index.html file located in the wwwroot folder that was previously used to host the Aurelia application can be deleted.

The code associated with this post can be found here.

Aurelia with an ASP.NET Core API: Modeling and Displaying Data in Aurelia

This is the third entry in a series using Aurelia and ASP.NET Core together. Each post builds on the previous and all the code is available on Github.

Part 1 – Add Aurelia to an ASP.NET Core Project
Part 2 – Aurelia with an ASP.NET Core API
Part 3 – Aurelia with an ASP.NET Core API: Modeling and Displaying Data in Aurelia (this post)
Github repo with the code for all of the parts with a release to go with each post

Starting point

Starting with the code from last weeks post we have a single solution with two projects. The Contacts project contains a basic razor UI for CRUD operations related to contact management as well as an API to provide that contact data to other applications.

The Aurelia project is a MVC application with Aurelia. At the moment the MVC and Aurelia applications don’t interact. In its current state the Aurelia application will connect to the Contacts API, download a list of contacts, and display the names of the contacts.

The goal

This post will cover taking the data from the Contacts API and mapping it to a JavaScript model class. Next the existing display of contacts will be removed and replaced with a contact list component.

Create a model

Create a contacts folder inside the src folder of the Aurelia project. Next add a  contact.js file. This will be the model of a contact in the system. At the moment it only contains a constructor and a  getAddress function. getAddress is just a demonstration of the model providing some functionality and not just being a data container.

The  Contact class ends up with all the properties of the  data that was past to the constructor. In this case is all the properties from the  Contact class in the Contact project. Coming from a mostly C# background the dynamic nature of JavaScript takes a little bit of getting used too.

 File naming an view/view model location

I hit a problem with how my files were named and Aurelia’s view/view model location strategy. I haven’t found a list of the conventions, but here is what I found playing around based on a view model named ContactList.

Filename Element Located
ContactList contact-list No
Contact-List contact-list No
Contact-List Contact-List No
contactlist contactlist No
contact-list contact-list Yes

Had the class name been  Contactlist then the  contactlist in the list above would have worked. For more information on how view are located check out this section of the Aurelia documentation.

Renaming for consistency

Based on research into why a view was not being located I am doing a bit of reorganizing in the project. All the contact related files are moving to a new contacts folder and the  contactService.js is being renamed to  contact-service.js. This is following the idea of organizing code by feature instead of type of file.

Update the Contact Service to use the new Contact class

In the contacts folder open the  contact-service.js file. Next add an import for the  Contact model class.

Next to the  GetAll function add a line to convert the data to a  Contact.

Here is the complete contact-service.js file.

To verify the returned results are actually using the  Contact model class change the call in  App.js to use the  getAddress function instead of just printing the contact names.

Run the application and it will print customer addresses. Note that the URL for the Aurelia application is http://localhost:37472/index.html.

Adding a contact list

Add two new files to the contacts folder for  contact-list.html and  contact-list.js which will result in the following structure.


The view model

contact-list.js is the view model for the contact list and will handle calling the  ContactService to get a list of contacts to display. The contact service needs to be imported and injected via the constructor. Additionally the constructor is setting up an array that will be used to store the contacts after they are retrieved.

The call to the contact service is handled in the  created function which is automatically called as part of Aurelia’s component lifecycle. For more information on the component lifecycle see the official documentation here. The following is the full definition of the  ContactList view model class.

The view

contact-list.html is the view that Aurelia will map and use with contact-list.js. As before this view is going to be very basic to keep the noise down. The view is a template with an unordered list of contact names and their addresses.

The  repeat.for tells Aurelia to output a list item for each contact found in the  contacts property of the view model.  ${} is a one way binding to the  name property of the current contact. Also notice  ${contact.getAddress()} which is one way binding the result of a function from the  Contact model class.

Displaying a component

Now the component needs to be displayed. For simplicity the contact list will be shown directly from the main application view ( app.html). The sample from last week will need to be cleared out before adding the contact list view. In the end the view should contain the following.

require from is importing the contact list and then the  contact-list tag determines where the contact list will show. Aurelia makes all components available in this manner. They just needs to be required in to be used as a tag.

Finally make sure to clear out  app.js if using the sample from last week as retrieving contact list data has been moved to the contact list view model.

When the application needs it the  App class is where the application level router would go.

Wrap up

Aurelia is always a pleasant surprise after being away from it for awhile. After getting project setup and conventions down it is always pleasant to use. The documentation is very good for the most part. As you can tell from this post I had some trouble with conventions which is something I wish was covered better in the docs, and if it is and I just missed it please leave a comment.

The code associated with this post can be found here.

Aurelia with an ASP.NET Core API

In last week’s post I covered creating a new ASP.NET Core project and then adding in Aurelia. The Aurelia application did nothing except output hello world. This week I am going to take an existing contacts API and the Aurelia project from last week use them together to make the Aurelia application display the name of the contacts from the API.

Part 1 – Add Aurelia to an ASP.NET Core Project
Part 2 – Aurelia with an ASP.NET Core API (This Post)
Part 3 – Aurelia with an ASP.NET Core API: Modeling and Displaying Data in Aurelia
Part 4 – Aurelia with ASP.NET Core: Host Aurelia from a Controller
Github repo with the code for all of the parts with a release to go with each post

Starting point overview

When you download a copy of the repo you will find an ASP.NET Core solution that contains two projects. The Aurelia project, obviously, contains the Aurelia application.

The Contacts project has a bit more going on. It has a set of razor views and a controllers to go with them that support standard CRUD operations, which at the moment is the best way to get contact information in the database. It also contains the ContactsApiController which will be the controller used to feed contacts to the Aurelia application.

Multiple startup projects in Visual Studio

In order to test this application both the Contacts and Aurelia projects to startup when the solution is run. Visual Studio provides an easy way to accomplish this. In the Solution Explorer window right click on the Solution and click Set StartUp Projects.


This will launch the Solution Property Pages dialog. Looks for the Startup Project page under Common Properties.


Match the screenshot above by selecting the radio button for Multiple startup projects. Then using the arrows on the right to make sure that Contacts project will start first. Also set the Action on Contacts to be start without debugging since that project will just be feeding data and won’t need to be debugged at the moment.

Then on the Aurelia project set the Action to Start. Click OK and now both projects will start up when solution is run from Visual Studio.

Accessing Data from the API

In order to get data from the API we will need away to talk HTTP from Aurelia. Aurelia provides two libraries that provide this functionality which you can read about here. For this post I will be using Aurelia’s fetch client which based on the experimental Fetch API. The Fetch API isn’t supported by all browsers at point so if you need it there a polyfill can be found here.

Installing the Aurelia Fetch Client

If you started with the project from GitHub repo linked about then the fetch client will already be included in the projects dependencies, but if not I wanted to cover getting it installed. Using a command prompt run the following npm command in the project’s directory.

Alternately add the following line to the  dependencies section of the project’s  package.json file and when the file is saved Visual Studio will automatically restore the new package.

The last step to making sure the fetch client available in the client application is to make sure it is included in the  vendor-bundle.js that is created by the Aurelia CLI’s build process. To do this open the  aurelia.json file found in the aurelia_project folder. In the  bundles section look for the bundle named  vendor-bundle.js and in its  dependencies section add  "aurelia-fetch-client". The following an abbreviated example from my file to to make it clear where the new line should go.

Create a client side service

It is important to not spread HTTP across the whole application and in order to achieve this goal it is a good idea to create a service that encapsulates the HTTP actions. For this example a contact service will be created that will handle all interactions with the ASP.NET Core API and the rest of the Aurelia application will just interact with the contact service.

To start create a services folder inside the src folder which contains the Aurelia client side application and added a new file to contain the new service called contactService.js.


The contact service will use the Aurelia fetch client to get all the contacts from the ASP.NET Core API. To do so it needs a constructor to allow injection and configuration of a HTTP client as well as a single function to get all the contacts. The following is the complete service.

A future post will come back to this code and make it more robust, but this post is just about getting data for the Aurelia application so the service is being kept as simple as possible.

Using the Contact Service

Again to keep the code as simple as possible the contact servers will be utilized directly in existing the existing  app.js file. The following is the class before any changes.

The following is the class after the changes to import and inject the contact service via the constructor as well as using the contact service to download and show the name of each contact.

Does it work?

At this point I used Visual Studio to launch both projects. In the Aurelia MVC application I navigated to http://localhost:37472/index.html which is the page that contains the Aurelia client application. Instead of being greeted by a list of contact names the application output “Hello World!”. That means that the Aurelia client application was running, but the contact service had failed for some reason. The console in the Chrome developer tools show the following error.

Fetch API cannot load http://localhost:13322/api/contactsApi/. No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://localhost:37472’ is therefore not allowed access. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.

The work around

Turns out that having two projects caused an issue I hadn’t considered. I now have to worry about cross-origin resource sharing. Not a topic that will be covered in this post. In order to work around this issues the Contacts project can be changed to added the following to the  Configure function of the  Startup class.

I am in no way saying that the above is the proper way to fix this issue. CORS is a subject I haven’t dug in to yet. The above is only meant to get this sample working. Please make sure to locate other resources on CORS for anything that is more than a demo.

Final thoughts

Running at this point will return the names of contacts as expected. Future posts will expand this application more. I want to get Angular 2 up as a new project in this same solution. When this solution has projects that contains the basics for MVC/razor, Aurelia and Angular 2 it will be in a good replacement the ASP.NET SPAs comparison reference application. Having each type of front end in a different project should make it easier to follow how each is set up. The code for today’s post can be found here.

Add Aurelia to an ASP.NET Core Project

In this post I am going to add a new project to the my existing ASP.NET Core Basics solution which can be found in this repository. The new project will be MVC 6  to which I will add in Aurelia. With both ASP.NET and Aurelia now being at RTM I thought this would be a good time to cover getting a new project setup.

Over time the ASP.NET Core Basics repo used in this post is going to be replacing my ASP.NET Core SPAs repo based on some feedback that having Aurelia and Angular 2 in the same project made it harder to see how each individual framework is setup.

Part 1 – Add Aurelia to an ASP.NET Core Project (This Post)
Part 2 – Aurelia with an ASP.NET Core API
Part 3 – Aurelia with an ASP.NET Core API: Modeling and Displaying Data in Aurelia
Part 4 – Aurelia with ASP.NET Core: Host Aurelia from a Controller
Github repo with the code for all of the parts with a release to go with each post

 Adding a new project to an existing solution

To add a new project to the existing solution right click on the solution and then click Add > New Project.


On the Add New Project dialog select ASP.NET Core Web Application (.NET Core), enter a name and then click OK.


On the New ASP.NET Core Web Application (.NET Core) dialog select Web Application. This application doesn’t need authentication so leave it set to No Authentication. Finally click OK.


After a few seconds the project creation will complete and the solution will contain two projects. The existing Contacts project that contains both a razor/normal implementation of a contacts list as well as an API implementation. The second project is the newly created Aurelia project.


Changing the startup project

Notice in the screenshot above that the Contacts project is in bold. This means that the Contacts project is set as the startup project and it will be the project that starts when the application is run (F5 or Cntrl + F5). In this post we will just be working with the Aurelia project so we need to make it the startup project. To do this right click the Aurelia project and select Set as StartUp Project.


Now if you hit F5 the Aurelia project will run. Visual Studio provides a lot of flexibility around which projects start up. You can select a single, have which ever project you have to have select, or even multiple projects.  In a later post we will need both projects to start up and I will cover that when we have the need.

Install the Aurelia CLI

Make sure you have a minimum of NodeJs 4.x or above installed. If you need the installer it can be found here. After the install is complete open a command prompt and run the following command to install the Aurelia CLI.

Add Aurelia to existing ASP.NET Core Project

In a command prompt navigate to the folder that contains the xproj file for the ASP.NET Core project created above. Now the Aurelia CLI can be used to setup a new Aurelia project at the current location using the following command.

There will be a series of prompts the first of which is the selection of which platform to use. Select the option for ASP.NET Core (option 2). I used the defaults for most of the remaining prompts. The exception was for unit testing which I selected no on just to keep the project simpler not because I think testing is a bad idea.

When the Aurelia CLI finishes its file creation and dependency restore your project will contain the highlighted new files and folders.


Notice that I have a warning on Dependencies that something is not installed. There is a quirky issue with Visual Studio that Scott Hanselman has blogged about here. He goes in to a good bit of detail about what is going on as well as suggesting a work around. It has to do with npm and not being about to restore an optional package that isn’t meant for Windows machines.


The Aurelia CLI creates a set of tasks to help with building, transpiling the Aurelia part of the applications. I wrote a couple of posts over the couple few weeks dealing with converting a project to use glup as well as how to get gulp working with ES 2015.

I am going to cover the abbreviated version of those two post here. Add a new file called  gulpfile.babel.js in the root of the project, where your  project.json is located. The Aurelia CLI added all the needed items in the  devDependencies section of  package.json.

gulp no go

At this point I attempted to include the tasks under  aurelia_project/tasks using  require('require-dir')('aurelia_project/tasks');. This failed completely. I couldn’t get any of the items in the tasks folder to show up. I am not sure why this didn’t work. My best guess is that the tasks in the tasks folder are exporting  gulp.series and not  gulp.task. I just don’t know enough about gulp at this point to now how to fix/work around this or if what I am trying to do is just not the right way it should be used.

The gulp work around

I spent more time that I would have like working on getting gulp to pick up the items in the tasks folder, but I don’t want to have to run a CLI command every time I do a build to make sure all the Aurelia related files are up to date. As a work around I decided to add a gulp task to invoke the CLI command for me.

To start open  package.json  and add the following to the  devDependencies section which allows shell commands to be run from gulp.

Next in  gulpfile.babel.js added the proper imports and created tasks for the CLI commands I wanted to run. In the case I am just showing the build command.

Using the Task Runner Explorer this task can now be set to run after a build of the MVC project.


This accomplishes what I wanted, but it feels like a hack. If anyone knows a better way please let me know.

It’s Alive!

At this point if you run the application it will go to the normal default home page that gets created by the Visual Studio template. For me that address is  http://localhost:37472/. From there if you add index.html, the full address is  http://localhost:37472/index.html, you will be invoking the Aurelia application.

At this point all you will see is “Hello World!”. Not that impressive I know, but it is a starting point that we will build on in future posts.

The associated code can be found here.

Unexpected token import with gulp

I have started to play with the release version of Aurelia. My current goal is to see what it takes to get going with Aurelia and ASP.NET Core now that both are RTM. I have hit a couple of road blocks that have ended up being new post of their own. For example this post that covers converting a new ASP.NET Core application to use gulp is one example. Today’s post is going to cover another issue I hit trying to use the gulp tasks created by the Aurelia CLI. There will not be anything Aurelia related in this post that will another post at a later date.

gulp setup

My gulpfile.js is nothing but a reference a directory of tasks. The full file looks like the following.

Then I have a single task in tasks/exampleTask.js that consists of the following.

The error

With the above in place if you look at the task runner explorer you will see that Gulpfile.js shows a failed to load error instead of the helloGulp task.


As suggested by task runner explorer open the output window. There are many different things that use the output window so be sure and change show output from option to Task Runner Explorer. With that done you will be able to see why the task failed to load. The following is the error I am getting.

The fix

I did some googling and I found this post by Mark Goodyear on using ES6 (or ES 2015) with gulp. It turns out the tasks generated by the Aurelia CLI are using ES 2015 and in order to use ES 2015 with gulp there are a few steps that must be taken first. Mark does a great job explaining those steps, but I am going to include a summary from the Visual Studio perspective.

Verify the devDependencies section in  package.json contains the following. require-dir is only required if your gulpfile or tasks are using it.

Next create a  .babelrc file at the same level as the  package.json file with the following contents.

Then rename  gulpfile.js to  gulpfile.babel.js.

Back in the Task Runner Explorer hit the refresh button in the top left of the window which should now load your list of tasks under Gulpfile.babel.js with no errors.