postcss-less
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:
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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.
postcss(plugins)
.process(lessText, { syntax: syntax })
.then(function (result) {
result.content // LESS with transformations
});
LESS Specific Parsing
@import
Parsing of LESS-specific @import statements and options are supported.
The AST will contain an AtRule node with:
- an
import: trueproperty - 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.
// Main theme color
--color: red;
}
The AST will contain a Comment node with an inline: true property.
Mixins
Parsing of LESS mixins is supported.
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.
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.
const syntax = require('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