supersimplenet/postcss-unrgba

Convert rgba() values to hex

UnRGBA

UnRGBA changes rgba() values to hex. This can be useful for outputting CSS for older browsers like Internet Explorer 8.

/* before */

.hero {
	background: rgba(153, 221, 153, .8);
	border: solid 1px rgba(100, 102, 103, .8);
	border-right-color: rgba(100, 102, 103, 0);
}

/* after */

.hero {
	background: #99dd99;
	border: solid 1px #646667;
	border-right-color: transparent;
}

Usage

Add UnRGBA to your build tool:

npm install postcss-unrgba --save-dev

Node

require('postcss-unrgba')({ /* options */ }).process(YOUR_CSS);

PostCSS

Add PostCSS to your build tool:

npm install postcss --save-dev

Load UnRGBA as a PostCSS plugin:

postcss([
    require('postcss-unrgba')({ /* options */ })
]);

Gulp

Add Gulp PostCSS to your build tool:

npm install gulp-postcss --save-dev

Enable UnRGBA within your Gulpfile:

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

gulp.task('css', function () {
    return gulp.src('./css/src/*.css').pipe(
        postcss([
            require('postcss-unrgba')({ /* options */ })
        ])
    ).pipe(
        gulp.dest('./css')
    );
});

Grunt

Add Grunt PostCSS to your build tool:

npm install grunt-postcss --save-dev

Enable UnRGBA within your Gruntfile:

grunt.loadNpmTasks('grunt-postcss');

grunt.initConfig({
    postcss: {
        options: {
            processors: [
                require('postcss-unrgba')({ /* options */ })
            ]
        },
        dist: {
            src: 'css/*.css'
        }
    }
});

Options

method

Type: String
Default: 'replace'

clone

Copies any properties with rgba values to new properties using hex.

/* before */

.hero {
	background: rgba(153, 221, 153, .8);
}

/* after */

.hero {
	background: #99dd99;
	background: rgba(153, 221, 153, .8);
}

replace

Copies any properties with rgba values to new properties using hex while removing the original.

/* before */

.hero {
	background: rgba(153, 221, 153, .8);
}

/* after */

.hero {
	background: #99dd99;
}

warn

Warns whenever a property with an rgba value is found.

filter

Type: Boolean
Default: false

true

Uses the Internet Explorer proprietary filter to preserve alpha-transparent backgrounds.

/* before */

.hero {
	background: rgba(153, 221, 153, .8);
}

/* after */

.hero {
	filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr='#8099dd99',endColorstr='#8099dd99');
}

false

Uses regular hexadecimal values when processing backgrounds.

/* before */

.hero {
	background: rgba(153, 221, 153, .8);
}

/* after */

.hero {
	background: #99dd99;
}

properties

Type: Array
Default: ['background', 'background-color', 'color', 'border', 'border-bottom', 'border-bottom-color', 'border-color', 'border-left', 'border-left-color', 'border-right', 'border-right-color', 'border-top', 'border-top-color', 'outline', 'outline-color']

Specifies the properties on which rgba values will be processed. If a falsey value is passed then all properties will be processed.