postcss-selector-not

What is postcss-selector-not?

The postcss-selector-not package is a PostCSS plugin that transforms :not() pseudo-class selectors to work with older browsers that do not support them. It helps in writing more maintainable and readable CSS by allowing the use of the :not() pseudo-class in a way that is compatible with a wider range of browsers.

What are postcss-selector-not's main functionalities?

Transform :not() pseudo-class

This feature transforms the :not() pseudo-class to a format that is compatible with older browsers. In this example, the CSS rule 'a:not(.foo) { color: red; }' is processed to ensure compatibility.

const postcss = require('postcss');
const selectorNot = require('postcss-selector-not');

const css = 'a:not(.foo) { color: red; }';

postcss([selectorNot]).process(css).then(result => {
  console.log(result.css);
});

Other packages similar to postcss-selector-not

postcss-preset-env

postcss-preset-env allows you to use future CSS features today by converting modern CSS into something most browsers can understand. It includes a variety of plugins, including one that handles :not() pseudo-classes, making it a more comprehensive solution compared to postcss-selector-not.

postcss-nesting

postcss-nesting enables nesting of CSS rules, which can sometimes overlap with the use of :not() pseudo-classes for scoping styles. While it doesn't directly transform :not() selectors, it provides a different approach to writing maintainable CSS.

README

PostCSS Selector Not

npm install postcss-selector-not --save-dev

PostCSS Selector Not transforms :not() W3C CSS level 4 pseudo classes to :not() CSS level 3 selectors following the Selectors 4 Specification.

p:not(:first-child, .special) {
	color: red;
}

/* becomes */

p:not(:first-child):not(.special) {
	color: red;
}

[!CAUTION] Only lists of simple selectors (:not(.a, .b)) will work as expected. Complex selectors (:not(.a > .b, .c ~ .d)) can not be downgraded.

Usage

Add PostCSS Selector Not to your project:

npm install postcss postcss-selector-not --save-dev

Use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssSelectorNot = require('postcss-selector-not');

postcss([
	postcssSelectorNot(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);