node_modules/postcss-less/lib/index.js

const Input = require('postcss/lib/input');

const LessParser = require('./LessParser');
const LessStringifier = require('./LessStringifier');

module.exports = {
  parse(less, options) {
    const input = new Input(less, options);
    const parser = new LessParser(input);

    parser.parse();

    return parser.root;
  },

  stringify(node, builder) {
    const stringifier = new LessStringifier(builder);
    stringifier.stringify(node);
  },

  nodeToString(node) {
    let result = '';

    module.exports.stringify(node, (bit) => {
      result += bit;
    });

    return result;
  }
};