A PostCSS plugin to replace CSS names based on a customizable renaming scheme.

• Getting Started
• Usage
• Options
  • strategy
  • by
  • prefix
  • except
  • ids
  • outputMapCallback

Getting Started

If using TypeScript, you will need "moduleResolution" to be "node16" or higher.

Install the plugin using npm

npm install --save-dev postcss postcss-rename

You can insert these plugins into your PostCSS stack

const postcss = require('postcss');
const classRename = require('postcss-rename');
const variableRename = require('postcss-rename/variable');

const myProcessedCss = postcss([
    classRename({ /* class renaming options here, see Options */ }),
    variableRename({ /* variable renaming options here, see Options */ }),
]).process(input).css;

Usage

postcss-rename makes it possible to rename CSS names in the generated stylesheet, which helps reduce the size of the CSS that is sent down to your users. It's designed to be used along with a plugin for a build system like Webpack that can rewrite HTML templates and/or references in JS. If you write such a plugin, let us know and we'll link it here!

Options

strategy

The renaming strategy to use:

• "none": Don't change names at all. This is the default strategy.

• "debug": Add an underscore at the end of each name. This is useful for keeping classes readable during debugging while still verifying that your templates and JavaScript aren't accidentally using non-renamed classes.

• "minimal": Use the shortest possible names, in order of appearance: the first class is renamed to .a, the second to .b, and so on.

This can also be a function that takes a CSS name (the full name in by-whole mode and the part in by-part mode) and returns its renamed value.

by

Note: this option only works for selector renaming.

Whether to rename in "by-whole mode" or "by-part mode".

• "whole": Rename the entire name at once, so for example .tall-image might become .a. This is the default mode.

• "part": Rename each hyphenated section of a name separately, so for example .tall-image might become .a-b.

This only applies to classes, and variables are always renamed in "by-whole mode"

prefix

A string prefix to add before every renamed class. This applies even if strategy is set to none.

In by-part mode, the prefix is applied to the entire class, but it isn't included in the output map.

When a prefix is given while renaming variables, a dash ("-") is added in between the prefix and the renamed CSS variable.

except

An array (or other Iterable) of names that shouldn't be renamed.

ids

Note: this option only works for selector renaming.

Whether to rename ID selectors as well as class selectors. Defaults to false. This does not apply to variable renaming.

outputMapCallback

A callback that's passed a map from original class names to their renamed equivalents, so that an HTML template or JS class references can also be renamed.

In by-part mode, this contains separate entries for each part of a class name. It doesn't contain any names that weren't renamed because of except.

Disclaimer: This is not an officially supported Google product.