gulp-usemin

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

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.

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

If you need to call the same pipeline twice, you need to define each task as a function that returns the stream object that should be used.

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

Blocks are expressed as:

<!-- build:<pipelineId>(alternate search path) <path> -->
... HTML Markup, list of script / link tags.
<!-- endbuild -->
  • pipelineId: pipeline id for options or remove to remove a section
  • 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 -->
 
<!-- build:remove -->
<script src="js/localhostDependencies.js"></script>
<!-- endbuild -->
 
<!-- build:inlinejs -->
<script src="../lib/angular-min.js"></script>
<script src="../lib/angular-animate-min.js"></script>
<!-- endbuild -->
 
<!-- build:inlinecss -->
<link rel="stylesheet" href="css/clear.css"/>
<link rel="stylesheet" href="css/main.css"/>
<!-- endbuild -->

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.

Type: String

Default alternate search path for files. Can be overridden by the alternate search path option for a given block.

Type: Array

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

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

Type: Boolean

Keep HTML comment when processing

|
+- 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 () {
  return 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>

#####0.3.14

  • fixed #91

#####0.3.13

  • works fine only with gulp-foreach

#####0.3.12

  • fixed #121

#####0.3.11

  • fixed #88

#####0.3.10

  • fixed uppercase Q bug (on case-sensetive file systems)

#####0.3.9

  • async tasks support

#####0.3.8

  • allow removal option (by tejohnso)
  • added support for single quotes (by adicirstei)

#####0.3.7

  • ouputRelativePath renamed outputRelativePath

#####0.3.6

  • ouputRelativePath option (by bhstahl)

#####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