Parcel supports Less files automatically using the @parcel/transformer-less plugin. When a .less file is detected, it will be installed into your project automatically.

Compiled Less files are also processed the same way as CSS, which means it is compiled for your browser targets, and any PostCSS plugins are also applied. CSS modules can also be used by naming your file with the .module.less extension.

Example usage


Referencing a Less file in an HTML file:

<link rel="stylesheet" href="style.less" />

Importing a Less file as a CSS module in JavaScript or TypeScript:

import * as classes from './style.module.less';

document.body.className = classes.body;

Directly compiling Less using the Parcel CLI

parcel build style.less



To configure Less, create a .lessrc file. To see the available options to configure Less see the official Less documentation.

Note: .lessrc.js, .lessrc.mjs, and .lessrc.cjs are also supported for JavaScript-based configuration, but should be avoided when possible because it reduces the effectiveness of Parcel's caching. Use a JSON based configuration format (e.g. .lessrc) instead.