Ice

document.querySelector('#field').parentNode.className = 'other-class';

let cost = {
gruzchik:500,
usluga_2:1000,
usluga_3:1500
}

const path = require('path');
const gulp = require('gulp');
const plumber = require('gulp-plumber');
gulp.task('scripts', async function () {
gulp.src(path.resolve(__dirname,'src/js/background.js'))
.pipe(plumber())
...
.pipe(gulp.dest(path.resolve(__dirname,'dist/js')));

let garbage = {
x: 0,
calc: function(val){
return this.x*val;
}
}
{
garbage.x = 5;
let y = garbage.calc(2);
}