gulp-usemin

Replaces references to non-optimized scripts or stylesheets into a set of HTML files (or any templates/views).

This task is designed for gulp 3.

Attention: v0.3.0 options is not compatible with v0.2.0.

Usage

First, install gulp-usemin as a development dependency:

npm install --save-dev gulp-usemin

Then, add it to your gulpfile.js:

var usemin = require('gulp-usemin');
var uglify = require('gulp-uglify');
var minifyHtml = require('gulp-minify-html');
var minifyCss = require('gulp-minify-css');
var rev = require('gulp-rev');

gulp.task('usemin', function() {
  gulp.src('./*.html')
    .pipe(usemin({
      css: [minifyCss(), 'concat'],
      html: [minifyHtml({empty: true})],
      js: [uglify(), rev()]
    }))
    .pipe(gulp.dest('build/'));
});

API

Blocks

Blocks are expressed as:

<!-- build:<pipelineId>(alternate search path) <path> -->
... HTML Markup, list of script / link tags.
<!-- endbuild -->

pipelineId: pipeline id for options
alternate search path: (optional) By default the input files are relative to the treated file. Alternate search path allows one to change that
path: the file path of the optimized file, the target output

An example of this in completed form can be seen below:

<!-- build:css style.css -->
<link rel="stylesheet" href="css/clear.css"/>
<link rel="stylesheet" href="css/main.css"/>
<!-- endbuild -->

<!-- build:js js/lib.js -->
<script src="../lib/angular-min.js"></script>
<script src="../lib/angular-animate-min.js"></script>
<!-- endbuild -->

<!-- build:js1 js/app.js -->
<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>
<!-- endbuild -->

Options

assetsDir

Type: String

Alternate root path for assets. New concated js and css files will be written to the path specified in the build block, relative to this path. Currently asset files are also returned in the stream.

any pipelineId

Type: Array

If exist used for modify files. If does not contain string 'concat', then it added as first member of pipeline

ouputRelativePath

Type: String Relative location to html file for new concatenated js and css.

Use case

|
+- app
|   +- index.html
|   +- assets
|       +- js
|          +- foo.js
|          +- bar.js
|   +- css
|       +- clear.css
|       +- main.css
+- dist

We want to optimize foo.js and bar.js into optimized.js, referenced using relative path. index.html should contain the following block:

    <!-- build:css style.css -->
    <link rel="stylesheet" href="css/clear.css"/>
    <link rel="stylesheet" href="css/main.css"/>
    <!-- endbuild -->

    <!-- build:js js/optimized.js -->
    <script src="assets/js/foo.js"></script>
    <script src="assets/js/bar.js"></script>
    <!-- endbuild -->

We want our files to be generated in the dist directory. gulpfile.js should contain the following block:

gulp.task('usemin', function(){
  gulp.src('./app/index.html')
    .pipe(usemin({
      js: [uglify()]
      // in this case css will be only concatenated (like css: ['concat']).
    }))
    .pipe(gulp.dest('dist/'));
});

This will generate the following output:

|
+- app
|   +- index.html
|   +- assets
|       +- js
|          +- foo.js
|          +- bar.js
+- dist
|   +- index.html
|   +- js
|       +- optimized.js
|   +- style.css

index.html output:

    <link rel="stylesheet" href="style.css"/>

    <script src="js/optimized.js"></script>

Changelog

#####0.3.5

Support for conditional comments inside build blocks (by simplydenis)

#####0.3.4

When a file does not exist an error containing the missing path is thrown

#####0.3.3

fixed dependencies
Add support for multiple alternative paths (by peleteiro)

#####0.3.2

fixed assetsDir option (by rovjuvano)

#####0.3.1

fixed fails to create source map files by uglify({outSourceMap: true})

#####0.3.0

new version of options

#####0.2.3

fixed html minify bug

#####0.2.2

allow gulp-usemin to work with minified source HTML (by CWSpear)
fixed alternate path bug (by CWSpear)
add assetsDir option (by pursual)
add rev option (by pursual)

#####0.2.1

fixed subfolders bug

#####0.2.0

no minification by default. New options API

#####0.1.4

add alternate search path support

#####0.1.3

add support for absolute URLs (by vasa-chi)

#####0.1.1

fixed aggressive replace comments

#####0.1.0

fixed some bugs. Add tests.

#####0.0.2

add minification by default

#####0.0.1

initial release

bhstahl/gulp-usemin