Merge branch 'develop' into css-variables

# Conflicts:
#	demo/dist/demo.css
#	demo/index.html
#	dist/plyr.css
#	gulpfile.js
#	package.json
#	yarn.lock

1 files changed, 2 insertions, 0 deletions

diff --git a/src/js/utils/is.js b/src/js/utils/is.js
index ab28f2ab..b005cd31 100644
--- a/src/js/utils/is.js
+++ b/src/js/utils/is.js
@@ -19,6 +19,7 @@ const isEvent = input => instanceOf(input, Event);
 const isKeyboardEvent = input => instanceOf(input, KeyboardEvent);
 const isCue = input => instanceOf(input, window.TextTrackCue) || instanceOf(input, window.VTTCue);
 const isTrack = input => instanceOf(input, TextTrack) || (!isNullOrUndefined(input) && isString(input.kind));
+const isPromise = input => instanceOf(input, Promise);
 
 const isEmpty = input =>
     isNullOrUndefined(input) ||
@@ -65,6 +66,7 @@ export default {
     keyboardEvent: isKeyboardEvent,
     cue: isCue,
     track: isTrack,
+    promise: isPromise,
     url: isUrl,
     empty: isEmpty,
 };