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Monday , August 21 2017

Control how your bower packages are installed with a gulpfile in ASP.NET 5

ASP.NET 5 beta 8 is out. Yes, that’s a lot of betas, but it’s important to get things right when you’re doing something new like this. You can find instructions in our documentation for installing ASP.NET 5 beta8 on Windows, Mac and Linux.

ASP.NET 5 uses the NuGet package manager to get server-side libraries but for client-side things we recommend folks use Bower. The most popular JavaScript and CSS libraries are there, and there’s no need for us to duplicate them in NuGet. This means ASP.NET 5 folks get to use the same great client-side libraries that other open web technologies enjoy.

In very early builds of ASP.NET 5 we put those libraries in a folder outside the web root (wwwroot) into bower_components or npm_components and then used a gulp/grunt (think MSBuild for JavaScript) task to copy the files you want to deploy into wwwroot in preparation for deployment. However this confused a LOT of folks who weren’t familiar with these tools. It also meant another step after installing a new JavaScript library. For example, you’d install angular with bower, then manually edit the gulp file to copy the .js you wanted into the folder of your choice, then run gulp to actually move it. These are common tasks for many of today’s open web developers, but have been confusing for ASP.NET 5 users who don’t usually work on the command line. So, this was changed a while back and your bower libraries show up right in your wwwroot.

bower stuff under wwwroot

While this is convenient change and great to starters, at some point you’ll want to graduate to a more formal process and want to move your bower client libraries back out, and then setup a task to move in just a files you want. Let’s take a moment and switch it back the way it was.

Here’s how.

Update your .bowerrc and project.json

In the root of your project is a .bowerrc file. It looks like this:


"directory": "wwwroot/lib"

Change it to something like this, and delete your actual wwwroot/lib folder.


"directory": "bower_components"

Exclude your source bower folder from your project.json

You’ll also want to go into your project.json file for ASP.NET 5 and make sure that your source bower_components folder is excluded from the project and any packing and publishing process.

"exclude": [
"wwwroot",
"node_modules",
"bower_components"
],

Update your gulpfile.js

In your gulpfile, make sure that path is present in paths. There are totally other ways to do this, including having gulp install bower and figure out the path. It’s up to you how sophisticated you want your gulpfile to get as long as the result is that production ready .js ends up in your wwwroot ready to be served to the customer. Also include a lib or destination for where your resulting JavaScript gets copied. Could be scripts, could be js, could be lib as in my case.

var paths = 
webroot: "./" + project.webroot + "/",
bower: "./bower_components/",
lib: "./" + project.webroot + "/lib/"
;

Add a copy task to your Gulpfile

Now open your Gulpfile and note all the tasks. You’re going to add a copy task to copy in just the files you want for deployment with your web app.

Here is an example copy task:

gulp.task("copy", ["clean"], function () 
var bower =
"bootstrap": "bootstrap/dist/**/*.js,map,css,ttf,svg,woff,eot",
"bootstrap-touch-carousel": "bootstrap-touch-carousel/dist/**/*.js,css",
"hammer.js": "hammer.js/hammer*.js,map",
"jquery": "jquery/jquery*.js,map",
"jquery-validation": "jquery-validation/jquery.validate.js",
"jquery-validation-unobtrusive": "jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"

for (var destinationDir in bower)
gulp.src(paths.bower + bower[destinationDir])
.pipe(gulp.dest(paths.lib + destinationDir));

);

Do note this is a very simple and very explicit copy tasks. Others might just copy more or less, or even use a globbing wildcard. It’s up to you. The point is, if you don’t like a behavior in ASP.NET 5 or in the general build flow of your web application you have more power than ever before.

Right click the Bower node in the Solution Explorer and “Restore Packages.” You can also do this in the command line or just let it happen at build time.

image

Looking in this simplified screenshot, you can see the bower dependencies that come down into the ~/bower_components folder. Just the parts I want are moved into the ~/wwwroot/lib/** folder when the gulpfile runs the copy task.

A new flow for my JavaScript

Feel free to share in the comments links to your blog posts on how YOU like your gulpfiles and build process to work!


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