Merge pull request #2943 from patrickarlt/expose-global

expose a global if window is present

src/Leaflet.js

@@ -21,8 +21,9 @@ if (typeof module === 'object' && typeof module.exports === 'object') {
 // define Leaflet as an AMD module
 } else if (typeof define === 'function' && define.amd) {
 	define(L);
+}
 
 // define Leaflet as a global L variable, saving the original L to restore later if needed
-} else {
+if (typeof window !== 'undefined') {
 	expose();
 }