Avoid registering custom elements if already registered

github · Mar 9, 2018 · be29a0a · be29a0a
1 parent dc3f3bb
commit be29a0a
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Showing 3 changed files with 12 additions and 6 deletions.
diff --git a/src/relative-time-element.js b/src/relative-time-element.js
@@ -54,5 +54,7 @@ function updateNowElements() {
 //   var time = new RelativeTimeElement()
 //   # => <relative-time></relative-time>
 //
-window.RelativeTimeElement = RelativeTimeElement
-window.customElements.define('relative-time', RelativeTimeElement)
+if (!window.customElements.get('relative-time')) {
+  window.RelativeTimeElement = RelativeTimeElement
+  window.customElements.define('relative-time', RelativeTimeElement)
+}
diff --git a/src/time-ago-element.js b/src/time-ago-element.js
@@ -14,5 +14,7 @@ export default class TimeAgoElement extends RelativeTimeElement {
   }
 }
 
-window.TimeAgoElement = TimeAgoElement
-window.customElements.define('time-ago', TimeAgoElement)
+if (!window.customElements.get('time-ago')) {
+  window.TimeAgoElement = TimeAgoElement
+  window.customElements.define('time-ago', TimeAgoElement)
+}
diff --git a/src/time-until-element.js b/src/time-until-element.js
@@ -14,5 +14,7 @@ export default class TimeUntilElement extends RelativeTimeElement {
   }
 }
 
-window.TimeUntilElement = TimeUntilElement
-window.customElements.define('time-until', TimeUntilElement)
+if (!window.customElements.get('time-until')) {
+  window.TimeUntilElement = TimeUntilElement
+  window.customElements.define('time-until', TimeUntilElement)
+}