Non dom environment (#369)

* check dom variables in server side environment

* update changelog type check (#334)

* simplification of the test for the existence of the property

* test if window.document is defined

CHANGELOG.md

@@ -24,6 +24,7 @@
 
 - Fix warning due to strict comparison of SDF property in image sprite (#303)
 - Fix tile placeholder replacement to allow for placeholders to be in a URL more than once. (#348)
+- Fix type check for non dom environment. (#334)
 
 ## 1.15.2
 

src/util/browser.ts

@@ -41,7 +41,7 @@ const exported = {
         return linkEl.href;
     },
 
-    hardwareConcurrency: navigator && navigator.hardwareConcurrency || 4,
+    hardwareConcurrency: typeof navigator !== 'undefined' && navigator.hardwareConcurrency || 4,
 
     get prefersReducedMotion(): boolean {
         if (!matchMedia) return false;

src/util/dom.ts

@@ -3,7 +3,7 @@ import Point from './point';
 import assert from 'assert';
 
 export default class DOM {
-    private static readonly docStyle = window.document && window.document.documentElement.style;
+    private static readonly docStyle = typeof window !== 'undefined' && window.document && window.document.documentElement.style;
 
     private static userSelect: string;