Package Exports

postcss-dir-pseudo-class
postcss-dir-pseudo-class/dist/index.cjs
postcss-dir-pseudo-class/dist/index.mjs

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (postcss-dir-pseudo-class) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

PostCSS Dir Pseudo Class

PostCSS Dir Pseudo Class lets you style by directionality using the :dir() pseudo-class in CSS, following the Selectors specification.

article h3:dir(rtl) {
  margin-right: 10px;
}

article h3:dir(ltr) {
  margin-left: 10px;
}

/* becomes */

[dir="rtl"] article h3 {
  margin-right: 10px;
}

[dir="ltr"] article h3 {
  margin-left: 10px;
}

Maintaining Specificity

Using PostCSS Dir Pseudo Class will not impact selector weight, but it will require having at least one [dir] attribute in your HTML. If you don’t have any [dir] attributes, consider using the following JavaScript:

// force at least one dir attribute (this can run at any time)
document.documentElement.dir=document.documentElement.dir||'ltr';

If you absolutely cannot add a [dir] attribute in your HTML or even force one via JavaScript, you can still work around this by presuming a direction in your CSS using the dir option, but understand that this will sometimes increase selector weight by one element (html).

Usage

Add PostCSS Dir Pseudo Class to your project:

npm install postcss-dir-pseudo-class --save-dev

Use PostCSS Dir Pseudo Class to process your CSS:

const postcssDirPseudoClass = require('postcss-dir-pseudo-class');

postcssDirPseudoClass.process(YOUR_CSS /*, processOptions, pluginOptions */);

Or use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssDirPseudoClass = require('postcss-dir-pseudo-class');

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

PostCSS Dir Pseudo Class runs in all Node environments, with special instructions for:

Node	PostCSS CLI	Webpack	Create React App	Gulp	Grunt

Options

dir

The dir option allows you presume a direction in your CSS. By default, this is not specified and you are required to include a direction [dir] attribute somewhere in your HTML, preferably on the html element.

Here’s an example of using the dir option to presume a left-to-right direction:

postcssDirPseudoClass({ dir: 'ltr' });

.example:dir(ltr) {
  margin-left: 10px;
}

.example:dir(rtl) {
  margin-right: 10px;
}

/* becomes */

html:not([dir="rtl"]) .example {
  margin-left: 10px;
}

[dir="rtl"] .example {
  margin-right: 10px;
}

preserve

The preserve option determines whether the original :dir() rule should remain in the CSS. By default, the original rule is not preserved.

postcssDirPseudoClass({ preserve: true });

article h3:dir(rtl) {
  margin-right: 10px;
}

article h3:dir(ltr) {
  margin-left: 10px;
}

/* becomes */

[dir="rtl"] article h3 {
  margin-right: 10px;
}

article h3:dir(rtl) {
  margin-right: 10px;
}

[dir="ltr"] article h3 {
  margin-left: 10px;
}

article h3:dir(ltr) {
  margin-left: 10px;
}