5.2.0-beta1

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## 5.2.0-beta
 
-* Fix Safari Back-Forward Cache issue with lazyloading image elements (fixes [#711](https://github.com/aFarkas/lazysizes/issues/711))
+* Fix wrong window context under very rare SSR  (fixes [#717](https://github.com/aFarkas/lazysizes/pull/717))
 * Fix Safari Back-Forward Cache issue with lazyloading image elements (fixes [#711](https://github.com/aFarkas/lazysizes/issues/711))
 * Add lazyload of autoplay videos to unveilhooks  (fixes [#697](https://github.com/aFarkas/lazysizes/issues/697))
 

lazysizes-umd.js

@@ -1,13 +1,13 @@
 (function(window, factory) {
-	var lazySizes = factory(window, window.document, Date);
+	var lazySizes = factory(window, window.document);
 	if(typeof module == 'object' && module.exports){
 		module.exports = lazySizes;
 	} else if (typeof define == 'function' && define.amd) {
 		define(lazySizes);
 	} else {
 		window.lazySizes = lazySizes;
 	}
-}(window, function l(window, document, Date) {
+}(window, function l(window, document, Date) { // Pass in the windoe Date function also for SSR because the Date class can be lost
 	'use strict';
 	/*jshint eqnull:true */
 
@@ -64,6 +64,10 @@
 
 	var _getAttribute = 'getAttribute';
 
+	/**
+	 * Update to bind to window because 'this' becomes null during SSR
+	 * builds.
+	 */
 	var addEventListener = window[_addEventListener].bind(window);
 
 	var setTimeout = window.setTimeout;

lazysizes.js

@@ -5,7 +5,7 @@
 		module.exports = lazySizes;
 	}
 }(typeof window != 'undefined' ?
-      window : {}, function l(window, document, Date) {
+      window : {}, function l(window, document, Date) { // Pass in the windoe Date function also for SSR because the Date class can be lost
 	'use strict';
 	/*jshint eqnull:true */
 
@@ -62,6 +62,10 @@
 
 	var _getAttribute = 'getAttribute';
 
+	/**
+	 * Update to bind to window because 'this' becomes null during SSR
+	 * builds.
+	 */
 	var addEventListener = window[_addEventListener].bind(window);
 
 	var setTimeout = window.setTimeout;