grunt-usemin
Replaces references to non-optimized scripts or stylesheets into a set of HTML files (or any templates/views).
Getting Started
If you haven't used grunt before, be sure to check out the Getting Started guide, as it explains how to create a gruntfile as well as install and use grunt plugins. Once you're familiar with that process, install this plugin with this command:
npm install grunt-usemin --save-dev
Workflow
usemin is composed of 2 different tasks (useminPrepare
and usemin
) that are part of the same workflow:
- useminPrepare: detects special construction (blocks) in the HTML files and update the
grunt
config to run concat
/uglify
/cssmin
/requirejs
on the files referenced in the block. It does not changes the HTML files it is working on. - usemin: in the HTML and CSS files it treats, it replaces the blocks by a reference to a single file, as well as all references to images, scripts, CSS files, by their minified/revved/.. version if it is found on the disk. As such this target rewrites the HTML and CSS files it is working on.
Usually, useminPrepare
is launched first, then the concat
, uglify
, cssmin
and requirejs
tasks are launched (they will created the minified/revved version of the referenced files), and then, in the end usemin
is launched.
The useminPrepare task
A special task which uses the build block HTML comments in markup to get back the list of files to handle, and initialize the grunt configuration appropriately, and automatically.
Custom HTML "block" comments are provided as an API for interacting with the build script. These comments adhere to the following pattern:
... HTML Markup, list of script / link tags.
- type: either
js
or css
- path: the file path of the optimized file, the target output
An example of this in completed form can be seen below:
<script src="js/app.js"></script>
<script src="js/controllers/thing-controller.js"></script>
<script src="js/models/thing-model.js"></script>
<script src="js/views/thing-view.js"></script>
Internally, the task parses your HTML markup to find each of these blocks, and initializes for you the corresponding Grunt config for the concat / uglify tasks when type=js
, the concat / cssmin tasks when type=css
.
The task also handles use of RequireJS, for the scenario where you specify the main entry point for your application using the "data-main" attribute as follows:
<script data-main="js/main" src="js/vendor/require.js"></script>
One doesn't need to specify a concat/uglify/cssmin or RequireJS configuration anymore.
It is using only one target: html
, with a list of the concerned files. For example, in your Gruntfile.js
:
'useminPrepare': {
html: 'index.html'
}
Options
uglify
Type: 'string'
Default: 'uglify'
Name of the tool used to uglify the JavaScript.
cssmin
Type: 'string'
Default: 'cssmin'
Name of the tool used to minify the CSS.
dirs
Type: 'array of strings'
Default: nil
Used to limit the directories that will be looked for revved files when replacing reference. By default all subdirectories are looked at.
dest
Type: 'string'
Default: nil
Base directory where the transformed files should be output.
The usemin task
This task is responsible for replacing in HTML and CSS files, references to non-minified files with reference to their minified/revved version if they are found on the disk.
usemin: {
html: ['**/*.html'],
css: ['**/*.css'],
options: {
dirs: ['temp', 'dist']
}
}
License
BSD license and copyright Google