google-maps-promise/es5/index.js

Wrapper for asynchronously load Google Maps API with Promise.

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	(factory((global.GoogleMapsPromise = {})));
}(this, (function (exports) { 'use strict';

var defaultUrlSettings = {
    url: 'https://maps.googleapis.com/maps/api/js',
    key: null,
    client: null,
    version: '3.32',
    channel: null,
    libraries: [],
    language: null,
    region: null,
    windowCallbackName: '__google_maps_api_provider_initializator__',
};
var windowWithAnything = window;
exports.urlSettings = Object.assign({}, defaultUrlSettings);
var resolvePromise;
var rejectPromise;
var promise;
var loaded;
var scriptElement;
init();
function load() {
    if (!loaded) {
        loaded = true;
        createLoader();
    }
    return promise;
}
function release() {
    if (!loaded) {
        cleanupEnvironment();
        return Promise.resolve();
    }
    return promise.then(cleanupEnvironment);
}
function init() {
    exports.urlSettings = Object.assign({}, defaultUrlSettings);
    loaded = false;
    promise = new Promise(function (resolve, reject) {
        resolvePromise = resolve;
        rejectPromise = reject;
    });
}
function createLoader() {
    if (windowWithAnything.google
        && windowWithAnything.google.maps) {
        resolvePromise(windowWithAnything.google.maps);
        return;
    }
    var onError = function () {
        return rejectPromise(new URIError("The script " + (scriptElement && scriptElement.src) + " is not accessible."));
    };
    scriptElement = document.createElement('script');
    scriptElement.type = 'text/javascript';
    scriptElement.src = createUrl();
    scriptElement.onerror = onError;
    windowWithAnything[exports.urlSettings.windowCallbackName] = function () {
        return resolvePromise(windowWithAnything.google.maps);
    };
    document.body.appendChild(scriptElement);
}
function createUrl() {
    var parts = [
        'callback=' + (exports.urlSettings.windowCallbackName
            || defaultUrlSettings.windowCallbackName),
    ];
    if (exports.urlSettings.key) {
        parts.push('key=' + exports.urlSettings.key);
    }
    if (exports.urlSettings.client) {
        parts.push('client=' + exports.urlSettings.client, 'v=' + (exports.urlSettings.version || defaultUrlSettings.version));
    }
    else if (exports.urlSettings.version) {
        parts.push('v=' + exports.urlSettings.version);
    }
    if (exports.urlSettings.channel) {
        parts.push('channel=' + exports.urlSettings.channel);
    }
    if (exports.urlSettings.libraries.length > 0) {
        parts.push('libraries=' + exports.urlSettings.libraries.join(','));
    }
    if (exports.urlSettings.language) {
        parts.push('language=' + exports.urlSettings.language);
    }
    if (exports.urlSettings.region) {
        parts.push('region=' + exports.urlSettings.region);
    }
    return (exports.urlSettings.url || defaultUrlSettings.url) + "?" + parts.join('&');
}
function cleanupEnvironment() {
    init();
    if (typeof windowWithAnything.google !== 'undefined') {
        delete windowWithAnything.google;
    }
    if (typeof windowWithAnything[exports.urlSettings.windowCallbackName] !== 'undefined') {
        delete windowWithAnything[exports.urlSettings.windowCallbackName];
    }
    if (scriptElement) {
        if (scriptElement.parentElement) {
            scriptElement.parentElement.removeChild(scriptElement);
        }
        scriptElement = null;
    }
}

exports.load = load;
exports.release = release;
exports.defaultUrlSettings = defaultUrlSettings;

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

})));