"dependencies": {
    "@babel/preset-env": "^7.4.5",
    "bootstrap": "^4.3.1",
    "browser-sync": "^2.26.7",
    "css-element-queries": "^1.2.0",
    "del": "^4.1.0",
    "font-awesome": "^4.7.0",
    "gulp": "^3.0.0",
    "gulp-autoprefixer": "^6.0.0",
    "gulp-clean-css": "^4.0.0",
    "gulp-concat": "^2.6.1",
    "gulp-ignore": "^2.0.2",
    "gulp-imagemin": "^5.0.3",
    "gulp-minify": "^3.1.0",
    "gulp-plumber": "^1.2.1",
    "gulp-rename": "^1.4.0",
    "gulp-replace": "^1.0.0",
    "gulp-rimraf": "^0.2.2",
    "gulp-sass": "^3.0.2",
    "gulp-sequence": "^1.0.0",
    "gulp-sourcemaps": "^2.6.5",
    "gulp-uglify": "^3.0.2",
    "gulp-watch": "^5.0.1",
    "javascript-detect-element-resize": "^0.5.3",
    "jquery": "^3.4.1",
    "libphonenumber-js": "^1.7.21",
    "run-sequence": "^2.2.1",
    "undescores-for-npm": "^1.0.0"
  }

import { getPhoneCode } from 'libphonenumber-js';
$jq(function(){
  console.log(getPhoneCode('GB'));
}

Uncaught SyntaxError: Unexpected token {

var lib = require('libphonenumber-js');
$jq(function(){
  lib.isValidNumberForRegion('23123412', 'GB')
}

Uncaught ReferenceError: require is not defined