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Mini Shell
Mini Shell
/**
* Utilities to get information about the current environment
*/
// --- Constants ---
export const hasWindowSupport = typeof window !== 'undefined'
export const hasDocumentSupport = typeof document !== 'undefined'
export const hasNavigatorSupport = typeof navigator !== 'undefined'
export const hasPromiseSupport = typeof Promise !== 'undefined'
/* istanbul ignore next: JSDOM always returns false */
export const hasMutationObserverSupport =
typeof MutationObserver !== 'undefined' ||
typeof WebKitMutationObserver !== 'undefined' ||
typeof MozMutationObserver !== 'undefined'
export const isBrowser = hasWindowSupport && hasDocumentSupport && hasNavigatorSupport
// Browser type sniffing
export const userAgent = isBrowser ? window.navigator.userAgent.toLowerCase() : ''
export const isJSDOM = userAgent.indexOf('jsdom') > 0
export const isIE = /msie|trident/.test(userAgent)
// Determine if the browser supports the option passive for events
export const hasPassiveEventSupport = (() => {
let passiveEventSupported = false
if (isBrowser) {
try {
const 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 const hasTouchSupport =
isBrowser && ('ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0)
export const hasPointerEventSupport =
isBrowser && Boolean(window.PointerEvent || window.MSPointerEvent)
/* istanbul ignore next: JSDOM only checks for 'IntersectionObserver' */
export const 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 const getEnv = (key, fallback = null) => {
const env = typeof process !== 'undefined' && process ? process.env || {} : {}
if (!key) {
/* istanbul ignore next */
return env
}
return env[key] || fallback
}
export const getNoWarn = () =>
getEnv('BOOTSTRAP_VUE_NO_WARN') || getEnv('NODE_ENV') === 'production'
Zerion Mini Shell 1.0