npm install @csstools/postcss-stepped-value-functions --save-dev
PostCSS Stepped Value Functions lets you use round, rem and mod stepped value functions, following the CSS Values 4 specification.
.test-functions {
padding: 8px mod(18px, 5px) 1px calc(rem(15px, 6px) + 50%);
transform: rotate(mod(-140deg, -90deg));
top: round(15px, 4px);
right: round(nearest, 15px, 4px);
bottom: round(up, 15px, 7px);
left: round(down, 15px, 4px);
width: round(to-zero, 15px, 4px);
}
/* becomes */
.test-functions {
padding: 8px 3px 1px calc(3px + 50%);
transform: rotate(-50deg);
top: 16px;
right: 16px;
bottom: 21px;
left: 12px;
width: 12px;
}Add PostCSS Stepped Value Functions to your project:
npm install postcss @csstools/postcss-stepped-value-functions --save-devUse it as a PostCSS plugin:
const postcss = require('postcss');
const postcssSteppedValueFunctions = require('@csstools/postcss-stepped-value-functions');
postcss([
postcssSteppedValueFunctions(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);Given the dynamic nature of custom properties it's impossible to know what the variable value is, which means the plugin can't compute a final value for the stylesheet.
Because of that, any usage that contains a var is skipped.
The preserve option determines whether the original notation
is preserved. By default, it is not preserved.
postcssSteppedValueFunctions({ preserve: true }).test-functions {
padding: 8px mod(18px, 5px) 1px calc(rem(15px, 6px) + 50%);
transform: rotate(mod(-140deg, -90deg));
top: round(15px, 4px);
right: round(nearest, 15px, 4px);
bottom: round(up, 15px, 7px);
left: round(down, 15px, 4px);
width: round(to-zero, 15px, 4px);
}
/* becomes */
.test-functions {
padding: 8px 3px 1px calc(3px + 50%);
padding: 8px mod(18px, 5px) 1px calc(rem(15px, 6px) + 50%);
transform: rotate(-50deg);
transform: rotate(mod(-140deg, -90deg));
top: 16px;
top: round(15px, 4px);
right: 16px;
right: round(nearest, 15px, 4px);
bottom: 21px;
bottom: round(up, 15px, 7px);
left: 12px;
left: round(down, 15px, 4px);
width: 12px;
width: round(to-zero, 15px, 4px);
}