list-all-tailwindcss.js

// https://regex101.com/r/30Xvde/1

const fs = require('fs')

const VAR_REG = /(?:@extend\s.\\@|&:extend\(\.\\@|@extend\s.\\\$)([^\;\r\n\t\s\)]+)/gm;

const sassInput = fs.readFileSync('style/style.scss', 'utf-8');
const lessInput = fs.readFileSync('style/style.less', 'utf-8');
const stylusInput = fs.readFileSync('style/style.styl', 'utf-8');

function getVariables(input) {
    return Array.from(input.matchAll(VAR_REG)).map(([, key]) => key);
}

[sassInput, lessInput, stylusInput].map(getVariables).forEach((v) => console.log(v));