@mrporter/inseason-analytics/lib/importAnalytics.js

In Season Analytics Module

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

exports.default = importAnalytics;
exports.findScript = findScript;
exports.createScript = createScript;
function importAnalytics(src) {
    return new Promise(function (resolve, reject) {
        if (!attempt()) {
            var script = findScript(src) || createScript(src);
            script.addEventListener('load', attempt);
            script.addEventListener('error', attempt);
        }

        function attempt(event) {
            if (event) {
                event.target.removeEventListener('load', attempt);
                event.target.removeEventListener('error', attempt);
            }
            if (_typeof(window.NAP) === 'object' && _typeof(window.NAP.WebAn) === 'object') {
                resolve(window.NAP.WebAn);
                return true;
            }
            if (event) {
                reject(new Error(event.type === 'load' ? 'Expected analytics library at "' + event.target.src + '" to expose "window.NAP.WebAn"' : 'Could not fetch analytics library from "' + event.target.src + '"'));
            }
            return false;
        }
    });
}

function findScript(src) {
    var scripts = Array.from(document.getElementsByTagName('script'));
    return scripts.find(function (el) {
        return el.src === src;
    });
}

function createScript(src) {
    var script = document.createElement('script');
    script.async = true;
    script.src = src;
    document.head.appendChild(script);
    return script;
}