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https://github.com/ben-eb/gulp-uncss

DEPRECATED. Remove unused CSS selectors.
https://github.com/ben-eb/gulp-uncss

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DEPRECATED. Remove unused CSS selectors.

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README 

        
# Deprecation Notice



Since UnCSS is now a PostCSS plugin which can be combined with other CSS

processing steps, there is little incentive to add a separate pass to your

build step. Instead of using gulp-uncss, you can replicate the functionality

by the following gulp task:



```js

var gulp = require('gulp');

var postcss = require('gulp-postcss');

var uncss = require('postcss-uncss');



gulp.task('default', function () {

    var plugins = [

        uncss({

            html: ['index.html', 'posts/**/*.html', 'http://example.com']

        }),

    ];

    return gulp.src('./src/*.css')

        .pipe(postcss(plugins))

        .pipe(gulp.dest('./dest'));

});

```



Now you can add other plugins to complement UnCSS, such as [cssnano].



[cssnano]: https://github.com/ben-eb/cssnano



# [gulp][gulp]-uncss



> Remove unused CSS with [UnCSS][orig].



*If you have any difficulties with the output of this plugin, please use the

[UnCSS tracker][bugs].*



## Install



With [npm](https://npmjs.org/package/gulp-uncss) do:



```

npm install gulp-uncss --save-dev

```



## Example



Single files, globbing patterns and URLs are all supported by gulp-uncss, and

can be mixed and matched:



```js

var gulp = require('gulp');

var uncss = require('gulp-uncss');



gulp.task('default', function () {

    return gulp.src('site.css')

        .pipe(uncss({

            html: ['index.html', 'posts/**/*.html', 'http://example.com']

        }))

        .pipe(gulp.dest('./out'));

});

```



gulp-uncss can also be used in a pipeline that involves CSS pre-processing.

Utilising many transforms on a single file is one of gulp's strengths:



```js

var gulp = require('gulp');

var uncss = require('gulp-uncss');

var sass = require('gulp-sass');

var concat = require('gulp-concat');

var nano = require('gulp-cssnano');



gulp.task('default', function () {

    return gulp.src('styles/**/*.scss')

        .pipe(sass())

        .pipe(concat('main.css'))

        .pipe(uncss({

            html: ['index.html', 'posts/**/*.html', 'http://example.com']

        }))

        .pipe(nano())

        .pipe(gulp.dest('./out'));

});

```



In just a few lines, we compiled SCSS source into a single file, removed unused

CSS and minified the output!



## Options



Please see the [UnCSS documentation][docs] for all of the options you can use.

Some of them aren't as necessary when using gulp-uncss, because the CSS to

analyse comes from the stream rather than the HTML files. The main options you

will likely be using are:



### html

Type: `Array|String`

*Required value.*



An array which can contain an array of files relative to your `gulpfile.js`, and

which can also contain URLs. Note that if you are to pass URLs here, then the

task will take much longer to complete. If you want to pass some HTML directly

into the task instead, you can specify it here as a string.



### ignore

Type: `Array`

Default value: `undefined`



Selectors that should be left untouched by UnCSS as it can't detect user

interaction on a page (hover, click, focus, for example). Both literal names and

regex patterns are recognized.



### timeout

Type: `Integer`

Default value: `undefined`



Specify how long to wait for the JS to be loaded.



Note that `options.ignoreSheets` is *already defined* for you. gulp-uncss will

only process CSS files in the stream.



## Contributing



Pull requests are welcome. If you add functionality, then please add unit tests

to cover it.



## License



MIT © [Ben Briggs](http://beneb.info)



[bugs]:    https://github.com/giakki/uncss/issues

[docs]:    https://github.com/giakki/uncss#within-nodejs

[gulp]:    https://github.com/gulpjs/gulp

[orig]:    https://github.com/giakki/uncss