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65 lines
2.7 KiB
65 lines
2.7 KiB
4 years ago
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/**
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* Utilities to get information about the current environment
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*/
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// --- Constants ---
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export var hasWindowSupport = typeof window !== 'undefined';
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export var hasDocumentSupport = typeof document !== 'undefined';
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export var hasNavigatorSupport = typeof navigator !== 'undefined';
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export var hasPromiseSupport = typeof Promise !== 'undefined';
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/* istanbul ignore next: JSDOM always returns false */
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export var hasMutationObserverSupport = typeof MutationObserver !== 'undefined' || typeof WebKitMutationObserver !== 'undefined' || typeof MozMutationObserver !== 'undefined';
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export var isBrowser = hasWindowSupport && hasDocumentSupport && hasNavigatorSupport; // Browser type sniffing
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export var userAgent = isBrowser ? window.navigator.userAgent.toLowerCase() : '';
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export var isJSDOM = userAgent.indexOf('jsdom') > 0;
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export var isIE = /msie|trident/.test(userAgent); // Determine if the browser supports the option passive for events
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export var hasPassiveEventSupport = function () {
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var passiveEventSupported = false;
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if (isBrowser) {
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try {
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var options = {
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get passive() {
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// This function will be called when the browser
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// attempts to access the passive property.
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/* istanbul ignore next: will never be called in JSDOM */
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passiveEventSupported = true;
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}
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};
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window.addEventListener('test', options, options);
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window.removeEventListener('test', options, options);
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} catch (err) {
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/* istanbul ignore next: will never be called in JSDOM */
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passiveEventSupported = false;
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}
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}
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return passiveEventSupported;
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}();
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export var hasTouchSupport = isBrowser && ('ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0);
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export var hasPointerEventSupport = isBrowser && Boolean(window.PointerEvent || window.MSPointerEvent);
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/* istanbul ignore next: JSDOM only checks for 'IntersectionObserver' */
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export var hasIntersectionObserverSupport = isBrowser && 'IntersectionObserver' in window && 'IntersectionObserverEntry' in window && // Edge 15 and UC Browser lack support for `isIntersecting`
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// but we an use intersectionRatio > 0 instead
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// 'isIntersecting' in window.IntersectionObserverEntry.prototype &&
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'intersectionRatio' in window.IntersectionObserverEntry.prototype; // --- Getters ---
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export var getEnv = function getEnv(key) {
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var fallback = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
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var env = typeof process !== 'undefined' && process ? process.env || {} : {};
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if (!key) {
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/* istanbul ignore next */
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return env;
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}
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return env[key] || fallback;
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};
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export var getNoWarn = function getNoWarn() {
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return getEnv('BOOTSTRAP_VUE_NO_WARN') || getEnv('NODE_ENV') === 'production';
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};
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