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postcss-custom-properties
Advanced tools
Use Custom Properties Queries in CSS
Weekly downloads
Readme
npm install postcss-custom-properties --save-dev
PostCSS Custom Properties lets you use Custom Properties in CSS, following the CSS Custom Properties specification.
:root {
--color-blue-dark: rgb(0, 61, 184);
--color-blue-light: rgb(0, 217, 255);
--color-pink: rgb(255, 192, 211);
--text-color: var(--color-pink);
}
.element {
/* custom props */
--border-color: var(--color-blue-light);
/* props */
border: 1px solid var(--border-color);
color: var(--text-color);
}
.element--dark {
--border-color: var(--color-blue-dark);
}
/* becomes */
:root {
--color-blue-dark: rgb(0, 61, 184);
--color-blue-light: rgb(0, 217, 255);
--color-pink: rgb(255, 192, 211);
--text-color: var(--color-pink);
}
.element {
/* custom props */
--border-color: var(--color-blue-light);
/* props */
border: 1px solid rgb(0, 217, 255);
border: 1px solid var(--border-color);
color: rgb(255, 192, 211);
color: var(--text-color);
}
.element--dark {
--border-color: var(--color-blue-dark);
}
Note:
:root
or html
selector.var()
will be used if the variable was not defined in the :root
or html
selector.Add PostCSS Custom Properties to your project:
npm install postcss postcss-custom-properties --save-dev
Use it as a PostCSS plugin:
const postcss = require('postcss');
const postcssCustomProperties = require('postcss-custom-properties');
postcss([
postcssCustomProperties(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);
PostCSS Custom Properties runs in all Node environments, with special instructions for:
The preserve
option determines whether properties using
custom properties should be preserved in their original form. By default these are preserved.
Custom property declarations are always preserved only var()
functions can be omitted.
postcssCustomProperties({ preserve: false })
:root {
--color-blue-dark: rgb(0, 61, 184);
--color-blue-light: rgb(0, 217, 255);
--color-pink: rgb(255, 192, 211);
--text-color: var(--color-pink);
}
.element {
/* custom props */
--border-color: var(--color-blue-light);
/* props */
border: 1px solid var(--border-color);
color: var(--text-color);
}
.element--dark {
--border-color: var(--color-blue-dark);
}
/* becomes */
:root {
--color-blue-dark: rgb(0, 61, 184);
--color-blue-light: rgb(0, 217, 255);
--color-pink: rgb(255, 192, 211);
--text-color: var(--color-pink);
}
.element {
/* custom props */
--border-color: var(--color-blue-light);
/* props */
border: 1px solid var(--border-color);
color: rgb(255, 192, 211);
}
.element--dark {
--border-color: var(--color-blue-dark);
}
If you're using Modular CSS such as, CSS Modules, postcss-loader
or vanilla-extract
to name a few, you'll probably
notice that custom properties are not being resolved. This happens because each file is processed separately so
unless you import the custom properties definitions in each file, they won't be resolved.
To overcome this, we recommend using the PostCSS Global Data plugin which allows you to pass a list of files that will be globally available. The plugin won't inject any extra code in the output but will provide the context needed to resolve custom properties.
For it to run it needs to be placed before the PostCSS Custom Properties plugin.
const postcss = require('postcss');
const postcssCustomProperties = require('postcss-custom-properties');
const postcssGlobalData = require('@csstools/postcss-global-data');
postcss([
postcssGlobalData({
files: [
'path/to/your/custom-selectors.css'
]
}),
postcssCustomProperties(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);
FAQs
Use Custom Properties Queries in CSS
The npm package postcss-custom-properties receives a total of 5,118,932 weekly downloads. As such, postcss-custom-properties popularity was classified as popular.
We found that postcss-custom-properties demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 5 open source maintainers collaborating on the project.
Did you know?
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