PostCSS plugin to remove all unused variables in a CSS file.
PostCSS plugin to remove all unused variables in a CSS file.
A --variable
is considered unused if it, or any other variables consuming it are not accessed by a single var()
statement in the whole CSS file.
This is unsafe if there is a possibility of a second CSS file accessing variables from the first one.
postcss-unused-var
is outdated, deprecated, and didn't work right.:root
.var()
by following variable dependency graph.npm install postcss-prune-var --save-dev
const pruneVar = require('postcss-prune-var');
const yourConfig = {
plugins: [pruneVar()],
};
Use this option to exclude certain files or folders that would otherwise be scanned.
const pruneVar = require('postcss-prune-var');
const yourConfig = {
plugins: [pruneVar({skip: ['node_modules/**']})],
};
Input:
:root {
--root-unused: red;
--root-unused-proxy: var(--root-unused);
--root-used: blue;
}
.foo {
--unused: red;
--unused-proxy: var(--unused);
--proxied: pink;
--proxy: var(--proxied);
--used: green;
color: var(--root-used);
background: linear-gradient(to bottom, var(--used), var(--proxy));
}
Output
:root {
--root-used: blue;
}
.foo {
--proxied: pink;
--proxy: var(--proxied);
--used: green;
color: var(--root-used);
background: linear-gradient(to bottom, var(--used), var(--proxy));
}