PostCSS Color Functional Notation

npm install postcss-color-functional-notation --save-dev

PostCSS Color Functional Notation lets you use space and slash separated color notation in CSS, following the CSS Color specification.

:root {
	--firebrick: rgb(178 34 34);
	--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
	--firebrick-hsl: hsla(0 68% 42%);
	--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}

/* becomes */

:root {
	--firebrick: rgb(178, 34, 34);
	--firebrick-a50: rgba(179, 34, 34, 0.5);
	--firebrick-hsl: hsl(0, 68%, 42%);
	--firebrick-hsl-a50: hsla(0, 68%, 42%, 0.5);
}

Usage

Add PostCSS Color Functional Notation to your project:

npm install postcss postcss-color-functional-notation --save-dev

Use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssColorFunctionalNotation = require('postcss-color-functional-notation');

postcss([
	postcssColorFunctionalNotation(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);

PostCSS Color Functional Notation runs in all Node environments, with special instructions for:

• Node
• PostCSS CLI
• PostCSS Load Config
• Webpack
• Next.js
• Gulp
• Grunt

Options

preserve

The preserve option determines whether the original notation is preserved. By default, it is not preserved.

postcssColorFunctionalNotation({ preserve: true })

:root {
	--firebrick: rgb(178 34 34);
	--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
	--firebrick-hsl: hsla(0 68% 42%);
	--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}

/* becomes */

:root {
	--firebrick: rgb(178, 34, 34);
	--firebrick-a50: rgba(179, 34, 34, 0.5);
	--firebrick-hsl: hsl(0, 68%, 42%);
	--firebrick-hsl: hsla(0 68% 42%);
	--firebrick-hsl-a50: hsla(0, 68%, 42%, 0.5);
}

@supports (color: rgb(0 0 0 / 0)) {
:root {
	--firebrick: rgb(178 34 34);
	--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
}
}

@supports (color: hsl(0 0% 0% / 0)) {
:root {
	--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}
}

enableProgressiveCustomProperties

The enableProgressiveCustomProperties option determines whether the original notation is wrapped with @supports when used in Custom Properties. By default, it is enabled.

Note

We only recommend disabling this when you set preserve to false or if you bring your own fix for Custom Properties.
See what the plugin does in its README.

postcssColorFunctionalNotation({ enableProgressiveCustomProperties: false })

:root {
	--firebrick: rgb(178 34 34);
	--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
	--firebrick-hsl: hsla(0 68% 42%);
	--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}

/* becomes */

:root {
	--firebrick: rgb(178, 34, 34);
	--firebrick: rgb(178 34 34);
	--firebrick-a50: rgba(179, 34, 34, 0.5);
	--firebrick-a50: rgb(70% 13.5% 13.5% / 50%);
	--firebrick-hsl: hsl(0, 68%, 42%);
	--firebrick-hsl: hsla(0 68% 42%);
	--firebrick-hsl-a50: hsla(0, 68%, 42%, 0.5);
	--firebrick-hsl-a50: hsl(0 68% 42% / 50%);
}

Custom properties do not fallback to the previous declaration