PostCSS Gradients Interpolation Method
npm install @csstools/postcss-gradients-interpolation-method --save-dev
PostCSS Gradients Interpolation Method lets you use different interpolation methods in CSS gradient functions following CSS Images Module 4.
.example {
background-image: linear-gradient(in oklch, hsl(0deg 85% 75%) 0%, hsl(180deg 80% 65%) 100%);
}
:root {
--background-image: linear-gradient(in oklab, hsl(96, 42%, 24%) 0%, hsl(302, 67%, 25%) 100%);
}
/* becomes */
.example {
background-image: linear-gradient(rgb(245, 137, 137) 0%, rgb(248, 146, 114), rgb(244, 158, 94), rgb(235, 171, 82), rgb(220, 185, 81), rgb(201, 199, 95), rgb(177, 211, 118), rgb(151, 221, 146), rgb(125, 229, 177), rgb(103, 235, 208), rgb(94, 237, 237) 100%);
background-image: linear-gradient(in oklch, hsl(0deg 85% 75%) 0%, hsl(180deg 80% 65%) 100%);
}
:root {
--background-image: linear-gradient(rgb(56, 87, 35) 0%, rgb(64, 83, 46), rgb(70, 79, 54), rgb(76, 74, 62), rgb(82, 69, 68), rgb(86, 64, 75), rgb(91, 58, 81), rgb(95, 51, 87), rgb(99, 44, 93), rgb(103, 34, 98), rgb(106, 21, 104) 100%);
}
@supports (background: linear-gradient(in oklch, red 0%, red 0% 1%, red 2%)) {
:root {
--background-image: linear-gradient(in oklab, hsl(96, 42%, 24%) 0%, hsl(302, 67%, 25%) 100%);
}
}
Shortcomings
For best results you should always provide at least the color and position for each color stop. Double position color stops are supported.
.foo {
/* Only a color: can't transform */
background-image: linear-gradient(in oklch, black 0%, green, blue 100%);
/* Only an interpolation hint: can't transform */
background-image: linear-gradient(in oklch, black 0%, 25%, blue 100%);
}
.foo {
--red: red;
/* Color stop variable : can't transform */
background-image: linear-gradient(in oklch, black 0%, var(--red), blue 100%);
}
Usage
Add PostCSS Gradients Interpolation Method to your project:
npm install postcss @csstools/postcss-gradients-interpolation-method --save-dev
Use it as a PostCSS plugin:
const postcss = require('postcss');
const postcssGradientsInterpolationMethod = require('@csstools/postcss-gradients-interpolation-method');
postcss([
postcssGradientsInterpolationMethod(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);
PostCSS Gradients Interpolation Method runs in all Node environments, with special instructions for:
Options
preserve
The preserve
option determines whether the original notation
is preserved. By default, it is preserved.
postcssGradientsInterpolationMethod({ preserve: false })
.example {
background-image: linear-gradient(in oklch, hsl(0deg 85% 75%) 0%, hsl(180deg 80% 65%) 100%);
}
:root {
--background-image: linear-gradient(in oklab, hsl(96, 42%, 24%) 0%, hsl(302, 67%, 25%) 100%);
}
/* becomes */
.example {
background-image: linear-gradient(rgb(245, 137, 137) 0%, rgb(248, 146, 114), rgb(244, 158, 94), rgb(235, 171, 82), rgb(220, 185, 81), rgb(201, 199, 95), rgb(177, 211, 118), rgb(151, 221, 146), rgb(125, 229, 177), rgb(103, 235, 208), rgb(94, 237, 237) 100%);
}
:root {
--background-image: linear-gradient(rgb(56, 87, 35) 0%, rgb(64, 83, 46), rgb(70, 79, 54), rgb(76, 74, 62), rgb(82, 69, 68), rgb(86, 64, 75), rgb(91, 58, 81), rgb(95, 51, 87), rgb(99, 44, 93), rgb(103, 34, 98), rgb(106, 21, 104) 100%);
}
enableProgressiveCustomProperties
The enableProgressiveCustomProperties
option determines whether the original notation
is wrapped with @supports
when used in Custom Properties. By default, it is enabled.
preserve
to false
or if you bring your own fix for Custom Properties. See what the plugin does in its README.
postcssGradientsInterpolationMethod({ enableProgressiveCustomProperties: false })
.example {
background-image: linear-gradient(in oklch, hsl(0deg 85% 75%) 0%, hsl(180deg 80% 65%) 100%);
}
:root {
--background-image: linear-gradient(in oklab, hsl(96, 42%, 24%) 0%, hsl(302, 67%, 25%) 100%);
}
/* becomes */
.example {
background-image: linear-gradient(rgb(245, 137, 137) 0%, rgb(248, 146, 114), rgb(244, 158, 94), rgb(235, 171, 82), rgb(220, 185, 81), rgb(201, 199, 95), rgb(177, 211, 118), rgb(151, 221, 146), rgb(125, 229, 177), rgb(103, 235, 208), rgb(94, 237, 237) 100%);
background-image: linear-gradient(in oklch, hsl(0deg 85% 75%) 0%, hsl(180deg 80% 65%) 100%);
}
:root {
--background-image: linear-gradient(rgb(56, 87, 35) 0%, rgb(64, 83, 46), rgb(70, 79, 54), rgb(76, 74, 62), rgb(82, 69, 68), rgb(86, 64, 75), rgb(91, 58, 81), rgb(95, 51, 87), rgb(99, 44, 93), rgb(103, 34, 98), rgb(106, 21, 104) 100%);
--background-image: linear-gradient(in oklab, hsl(96, 42%, 24%) 0%, hsl(302, 67%, 25%) 100%);
}
Custom properties do not fallback to the previous declaration