[tests]: https://img.shields.io/circleci/project/github/shellscape/postcss-less.svg [tests-url]: https://circleci.com/gh/shellscape/postcss-less [cover]: https://codecov.io/gh/shellscape/postcss-less/branch/main/graph/badge.svg [cover-url]: https://codecov.io/gh/shellscape/postcss-less [size]: https://packagephobia.now.sh/badge?p=postcss-less [size-url]: https://packagephobia.now.sh/result?p=postcss-less [PostCSS]: https://github.com/postcss/postcss [PostCSS-SCSS]: https://github.com/postcss/postcss-scss [LESS]: https://lesscss.org/ [Autoprefixer]: https://github.com/postcss/autoprefixer [Stylelint]: http://stylelint.io/

postcss-less

[![tests][tests]][tests-url] [![cover][cover]][cover-url] [![size][size]][size-url]

A [PostCSS] Syntax for parsing [LESS]

_Note: This module requires Node v6.14.4+. poscss-less is not a LESS compiler. For compiling LESS, please use the official toolset for LESS._

Install

Using npm:

npm install postcss-less --save-dev

Please consider becoming a patron if you find this module useful.

Usage

The most common use of postcss-less is for applying PostCSS transformations directly to LESS source. eg. ia theme written in LESS which uses [Autoprefixer] to add appropriate vendor prefixes.

import postcss from 'postcss';
import syntax from 'postcss-less';
const result = await postcss().process(lessText, { syntax: syntax });
result.content; // LESS with transformations

LESS Specific Parsing

@import

Parsing of LESS-specific @import statements and options are supported.

@import (option) 'file.less';

The AST will contain an AtRule node with:

• an import: true property
• a filename: property containing the imported filename
• an options: property containing any import options specified

Inline Comments

Parsing of single-line comments in CSS is supported.

:root {
  // Main theme color
  --color: red;
}

The AST will contain a Comment node with an inline: true property.

Mixins

Parsing of LESS mixins is supported.

.my-mixin {
  color: black;
}

The AST will contain an AtRule node with a mixin: true property.

!important

Mixins that declare !important will contain an important: true property on their respective node.

Variables

Parsing of LESS variables is supported.

@link-color: #428bca;

The AST will contain an AtRule node with a variable: true property.

_Note: LESS variables are strictly parsed - a colon (:) must immediately follow a variable name._

Stringifying

To process LESS code without PostCSS transformations, custom stringifier should be provided.

import postcss from 'postcss';
import syntax from 'postcss-less';
const less = 
    // inline comment

.container {
        .mixin-1();
        .mixin-2;
        .mixin-3 (@width: 100px) {
            width: @width;
        }
    }
.rotation(@deg:5deg){
      .transform(rotate(@deg));
    }
;
const result = await postcss().process(less, { syntax });
// will contain the value of less
const { content } = result;

Use Cases

• Lint LESS code with 3rd-party plugins.
• Apply PostCSS transformations (such as Autoprefixer) directly to the LESS source code

Meta

CONTRIBUTING

LICENSE (MIT)