TheMiksa

import crypto from 'crypto';

const signString = private_key + data + private_key; // юзал для интеграции liqpay
const sha1 = crypto.createHash('sha1');

sha1.update(signString);
const signature = sha1.digest('base64');

const diffArray = (arr1, arr2) => {
            const newArr = [];
            for (let key of arr1) {
                if (arr2.indexOf(key) === -1) {
                    newArr[newArr.length] = key;
                }
            }
            for (let key of arr2) {
                if (arr1.indexOf(key) === -1 && newArr.indexOf(key)) {
                    newArr[newArr.length] = key;
                }
            }
            return newArr;
        }