fix how we check if running in browser, fixes #609

package.json

@@ -14,6 +14,7 @@
     "get-window": "^1.1.1",
     "immutable": "^3.8.1",
     "is-empty": "^1.0.0",
+    "is-in-browser": "^1.1.3",
     "keycode": "^2.1.2",
     "react-portal": "^3.0.0",
     "selection-is-backward": "^1.0.0",

src/constants/environment.js

@@ -1,4 +1,6 @@
 
+import browser from 'is-in-browser'
+
 /**
  * Browser matching rules.
  *
@@ -43,7 +45,7 @@ let OS
  * Run the matchers when in browser.
  */
 
-if (process.browser) {
+if (browser) {
   const { userAgent } = window.navigator
 
   for (const rule of BROWSER_RULES) {