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@csstools/postcss-light-dark-function
Advanced tools
npm install @csstools/postcss-light-dark-function --save-dev
PostCSS Light Dark Function lets you use the light-dark
color function in
CSS, following the CSS Color 5 Specification.
Read more about this feature on mdn:
light-dark()
color-scheme
With both features combined you can mix and match color schemes in a single document, while also respecting the user's preferences.
.foo {
color: light-dark(pink, magenta);
}
.bar {
--bar: light-dark(cyan, deepskyblue);
}
/* becomes */
.foo {
--csstools-light-dark-toggle--0: var(--csstools-color-scheme--dark) pink;
color: var(--csstools-light-dark-toggle--0, magenta);
color: light-dark(pink, magenta);
}
.bar {
--csstools-light-dark-toggle--1: var(--csstools-color-scheme--dark) cyan;
--bar: var(--csstools-light-dark-toggle--1, deepskyblue);
& * {
--csstools-light-dark-toggle--1: var(--csstools-color-scheme--dark) cyan;
--bar: var(--csstools-light-dark-toggle--1, deepskyblue);
}
}
@supports (color: light-dark(red, red)) {
.bar {
--bar: light-dark(cyan, deepskyblue);
}
}
Declare that your document supports both light and dark mode:
:root {
color-scheme: light dark;
}
/* becomes */
:root {
--csstools-color-scheme--dark: ;
color-scheme: light dark;
}@media (prefers-color-scheme: dark) {:root {
--csstools-color-scheme--dark: initial;
}
}
Dynamically alter the supported color scheme for some elements:
:root {
/* Root only supports light mode */
color-scheme: light;
}
.foo {
/* This element and its children only support dark mode */
color-scheme: dark;
}
/* becomes */
:root {
/* Root only supports light mode */
--csstools-color-scheme--dark: ;
color-scheme: light;
}
.foo {
/* This element and its children only support dark mode */
--csstools-color-scheme--dark: initial;
color-scheme: dark;
}
Add PostCSS Light Dark Function to your project:
npm install postcss @csstools/postcss-light-dark-function --save-dev
Use it as a PostCSS plugin:
const postcss = require('postcss');
const postcssLightDarkFunction = require('@csstools/postcss-light-dark-function');
postcss([
postcssLightDarkFunction(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);
PostCSS Light Dark Function runs in all Node environments, with special instructions for:
The preserve
option determines whether the original notation
is preserved. By default, it is preserved.
postcssLightDarkFunction({ preserve: false })
.foo {
color: light-dark(pink, magenta);
}
.bar {
--bar: light-dark(cyan, deepskyblue);
}
/* becomes */
.foo {
--csstools-light-dark-toggle--0: var(--csstools-color-scheme--dark) pink;
color: var(--csstools-light-dark-toggle--0, magenta);
}
.bar {
--csstools-light-dark-toggle--1: var(--csstools-color-scheme--dark) cyan;
--bar: var(--csstools-light-dark-toggle--1, deepskyblue);
& * {
--csstools-light-dark-toggle--1: var(--csstools-color-scheme--dark) cyan;
--bar: var(--csstools-light-dark-toggle--1, deepskyblue);
}
}
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
tofalse
or if you bring your own fix for Custom Properties.
See what the plugin does in its README.
postcssLightDarkFunction({ enableProgressiveCustomProperties: false })
FAQs
Use the light-dark() color function in CSS
We found that @csstools/postcss-light-dark-function demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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