From e4faf548049a2a45eeba6a0c7651c2c057be5836 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Tue, 31 Mar 2020 13:09:44 +0200
Subject: [PATCH] move history api feature detection to utils

---
 js/controllers/location.js | 4 +++-
 js/utils/device.js         | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/js/controllers/location.js b/js/controllers/location.js
index 3b66876..3a9afd5 100644
--- a/js/controllers/location.js
+++ b/js/controllers/location.js
@@ -1,3 +1,5 @@
+import { supportsHistoryAPI } from '../utils/device.js'
+
 /**
  * Reads and writes the URL based on reveal.js' current state.
  */
@@ -98,7 +100,7 @@ export default class Location {
 		else if( currentSlide ) {
 			// If we're configured to push to history OR the history
 			// API is not avaialble.
-			if( config.history || !window.history ) {
+			if( config.history || supportsHistoryAPI === false ) {
 				window.location.hash = this.getHash();
 			}
 			// If we're configured to reflect the current slide in the
diff --git a/js/utils/device.js b/js/utils/device.js
index ec1034f..1e787fb 100644
--- a/js/utils/device.js
+++ b/js/utils/device.js
@@ -12,4 +12,6 @@ export const isAndroid = /android/gi.test( UA );
 // up slides. Zoom produces crisper results but has a lot of
 // xbrowser quirks so we only use it in whitelisted browsers.
 export const supportsZoom = 'zoom' in testElement.style && !isMobile &&
-				( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
\ No newline at end of file
+				( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
+
+export const supportsHistoryAPI = typeof window.history.replaceState === 'function' && !/PhantomJS/.test( UA );
\ No newline at end of file