/* @flow */
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// can we use __proto__?
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export const hasProto = '__proto__' in {}
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// Browser environment sniffing
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export const inBrowser = typeof window !== 'undefined'
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export const inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform
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export const weexPlatform = inWeex && WXEnvironment.platform.toLowerCase()
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export const UA = inBrowser && window.navigator.userAgent.toLowerCase()
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export const isIE = UA && /msie|trident/.test(UA)
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export const isIE9 = UA && UA.indexOf('msie 9.0') > 0
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export const isEdge = UA && UA.indexOf('edge/') > 0
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export const isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android')
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export const isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios')
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export const isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge
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export const isPhantomJS = UA && /phantomjs/.test(UA)
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export const isFF = UA && UA.match(/firefox\/(\d+)/)
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// Firefox has a "watch" function on Object.prototype...
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export const nativeWatch = ({}).watch
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export let supportsPassive = false
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if (inBrowser) {
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try {
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const opts = {}
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Object.defineProperty(opts, 'passive', ({
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get () {
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/* istanbul ignore next */
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supportsPassive = true
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}
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}: Object)) // https://github.com/facebook/flow/issues/285
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window.addEventListener('test-passive', null, opts)
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} catch (e) {}
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}
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// this needs to be lazy-evaled because vue may be required before
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// vue-server-renderer can set VUE_ENV
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let _isServer
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export const isServerRendering = () => {
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if (_isServer === undefined) {
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/* istanbul ignore if */
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if (!inBrowser && !inWeex && typeof global !== 'undefined') {
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// detect presence of vue-server-renderer and avoid
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// Webpack shimming the process
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_isServer = global['process'] && global['process'].env.VUE_ENV === 'server'
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} else {
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_isServer = false
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}
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}
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return _isServer
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}
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// detect devtools
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export const devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__
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/* istanbul ignore next */
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export function isNative (Ctor: any): boolean {
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return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
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}
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export const hasSymbol =
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typeof Symbol !== 'undefined' && isNative(Symbol) &&
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typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys)
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let _Set
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/* istanbul ignore if */ // $flow-disable-line
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if (typeof Set !== 'undefined' && isNative(Set)) {
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// use native Set when available.
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_Set = Set
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} else {
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// a non-standard Set polyfill that only works with primitive keys.
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_Set = class Set implements SimpleSet {
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set: Object;
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constructor () {
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this.set = Object.create(null)
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}
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has (key: string | number) {
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return this.set[key] === true
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}
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add (key: string | number) {
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this.set[key] = true
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}
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clear () {
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this.set = Object.create(null)
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}
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}
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}
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export interface SimpleSet {
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has(key: string | number): boolean;
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add(key: string | number): mixed;
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clear(): void;
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}
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export { _Set }
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