bootstrap-vue/esm/utils/env.js

BootstrapVue, with more than 85 custom components, over 45 plugins, several custom directives, and over 300 icons, provides one of the most comprehensive implementations of Bootstrap v4 components and grid system for Vue.js. With extensive and automated W

/**
 * Utilities to get information about the current environment
 */
// --- Constants ---
export var hasWindowSupport = typeof window !== 'undefined';
export var hasDocumentSupport = typeof document !== 'undefined';
export var hasNavigatorSupport = typeof navigator !== 'undefined';
export var hasPromiseSupport = typeof Promise !== 'undefined';
/* istanbul ignore next: JSDOM always returns false */

export var hasMutationObserverSupport = typeof MutationObserver !== 'undefined' || typeof WebKitMutationObserver !== 'undefined' || typeof MozMutationObserver !== 'undefined';
export var isBrowser = hasWindowSupport && hasDocumentSupport && hasNavigatorSupport; // Browser type sniffing

export var userAgent = isBrowser ? window.navigator.userAgent.toLowerCase() : '';
export var isJSDOM = userAgent.indexOf('jsdom') > 0;
export var isIE = /msie|trident/.test(userAgent); // Determine if the browser supports the option passive for events

export var hasPassiveEventSupport = function () {
  var passiveEventSupported = false;

  if (isBrowser) {
    try {
      var options = {
        get passive() {
          // This function will be called when the browser
          // attempts to access the passive property.

          /* istanbul ignore next: will never be called in JSDOM */
          passiveEventSupported = true;
        }

      };
      window.addEventListener('test', options, options);
      window.removeEventListener('test', options, options);
    } catch (err) {
      /* istanbul ignore next: will never be called in JSDOM */
      passiveEventSupported = false;
    }
  }

  return passiveEventSupported;
}();
export var hasTouchSupport = isBrowser && ('ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0);
export var hasPointerEventSupport = isBrowser && Boolean(window.PointerEvent || window.MSPointerEvent);
/* istanbul ignore next: JSDOM only checks for 'IntersectionObserver' */

export var hasIntersectionObserverSupport = isBrowser && 'IntersectionObserver' in window && 'IntersectionObserverEntry' in window && // Edge 15 and UC Browser lack support for `isIntersecting`
// but we an use intersectionRatio > 0 instead
// 'isIntersecting' in window.IntersectionObserverEntry.prototype &&
'intersectionRatio' in window.IntersectionObserverEntry.prototype; // --- Getters ---

export var getEnv = function getEnv(key) {
  var fallback = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
  var env = typeof process !== 'undefined' && process ? process.env || {} : {};

  if (!key) {
    /* istanbul ignore next */
    return env;
  }

  return env[key] || fallback;
};
export var getNoWarn = function getNoWarn() {
  return getEnv('BOOTSTRAP_VUE_NO_WARN');
};