Евгений

em: function(less, fontsize, basefontsize){
    if (less.functions.functionRegistry.get('ispixel')){
        basefontsize = (basefontsize) ? basefontsize.value : 16
        return fontsize.value/basefontsize+'em';
    }
}

.block {
    font-size: em(16px);
}

new BrowserWindow({
    x: ...,
    y: ...
})

const isDesktop = window.matchMedia('only screen and (min-width: 1024px)');

if (isDesktop.matches) {
    // todo...
}

var lineObjects = [];

function createPAtch(max) {
    // ...
    var randPosX=Math.floor(Math.random()*window.innerWidth);
    var randPosY=Math.floor(Math.random()*window.innerHeight);

    lineObjects.push({ x: randPosX, y: randPosY });
    // ...
}

fetch('/api.php', {
    method: 'POST',
    headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        action: 'auth',
        payload: {
            email: ...,
            password: ...
        }
    })
});

<?php

require_once 'auth.class.php';

if ($_POST['action'] === 'auth') {
    Auth::isAuth($_POST['payload']);
}

'use strict';

const block = document.querySelector('.block');
const replaced = block.outerHTML.replace(/div/g, 'span');

block.outerHTML = replaced;