Development Bundles

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In this guide we'll go through the steps required to set up steal-tools development bundles and speed up your application development process.

This guide assumes the reader has a working application that can benefit from using development bundles; if that's not your case, please go check out the Progressive Loading guide and follow this guide once you get the myhub app up and running.

Install Dependencies

Edit your package.json to get the dependencies required to support this feature:

"devDependencies": {
  "steal": "^1.3.0",
  "steal-tools": "^1.2.0",

If you are using the steal-less package, make sure to update it to "^1.2.0", like this:

"devDependencies": {
  "steal-less": "^1.2.0",

Run npm install after you saved the changes.

Add npm script to generate the bundle

Edit your package.json and add a new npm script like the following:

"scripts": {
  "deps-bundle": "steal-tools bundle --deps"

Save the changes and run the deps-bundle script:

npm run deps-bundle

This should create a file dev-bundle.js at the root folder of your project. If StealJS is also loading your CSS files there should be a dev-bundle.css file, too.

It is possible to provide an alternative destination folder using the --dest option, run steal-tools bundle --help to see all the options available.

Modify the StealJS script tag

Add the deps-bundle attribute to your StealJS script tag like this:

<script src="./node_modules/steal/steal.js" deps-bundle></script>

If the --dest option was provided, deps-bundle needs to be a string with the path to the dev-bundle file. E.g: if dest is set to foo/bar, deps-bundle should be set to foo/bar/dev-bundle.

and that's it! Load your index.html page in the browser, check the network tab and you should note a decreased number of outgoing requests along with faster load times.

My application loads faster, but I want more!!!

The previous setup creates a bundle with the application dependencies located in the node_modules folder; steal-tools bundle accepts a --dev flag that will also bundle the configMain for faster loading times.

Just be aware that you will have to create the bundle every time configMain changes.

The setup process is similar to the one we just went through, a couple of changes are required though:

Modify the npm script

Edit your package.json like this:

"scripts": {
  "dev-bundle": "steal-tools bundle --dev"

Run the new npm script after saving the changes.

npm run dev-bundle

Modify the StealJS script tag

A different attribute is needed to setup StealJS so it loads the bundle before configMain is loaded:

<script src="./node_modules/steal/steal.js" dev-bundle></script>

If the --dest option of steal-tools bundle was provided, please make sure to pass the path to the bundle through the dev-bundle attribute.

and you're all set! Reload your browser window, fast isn't it?