Less (based on gulp)

const fs = require("fs");
var accord         = require('accord');
var assign         = require('object-assign');
var path           = require('path');
var replaceExt     = require('replace-ext');

const readlineSync = require('readline-sync');

var less           = accord.load('less');




var options = {}

var _id = process.argv.indexOf("--src")+1;

if (_id) console.time('Time');

var opts = assign({}, {
     compress: false,
     paths: []
}, options);


var render = function (str, opts){

    less.render(str, opts).then(function(res) {

        var file = {}

        file.contents = Buffer.from(res.result);
        file.path = replaceExt(opts.filename, '.css');

        return file;
    }).then(function(file) {

        fs.writeFileSync(file.path, file.contents)

        console.log('compilled successfull')

        console.timeEnd('Time');

    }).catch(function(err) {

        // Convert the keys so PluginError can read them
        err.lineNumber = err.line;
        err.fileName = err.filename;

        // Add a better error message
        err.message = err.message + ' in file ' + err.fileName + ' line no. ' + err.lineNumber;

        console.log(err.message)
    });

}

var start = async function (){

    var flag = true;

    do{

        if (!_id){

            opts.filename = readlineSync.question('listening ');

            console.time('Time');

        }
        else{


            opts.filename = process.argv[_id];
        }

        if (!fs.existsSync(opts.filename)) {
            break;
        }

        var str = fs.readFileSync(opts.filename, "utf8");

        await render(str, opts);

    }while(flag);

    console.log('exit');

}

start();