[fix] cache Clipboard.isAvailable() value

Fix #1149 Close #1150
necolas · Oct 23, 2018 · 5855e55 · 5855e55
1 parent 5033e12
commit 5855e55
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/packages/react-native-web/src/exports/Clipboard/index.js b/packages/react-native-web/src/exports/Clipboard/index.js
@@ -8,11 +8,16 @@
  * @flow
  */
 
+let clipboardAvailable;
+
 export default class Clipboard {
   static isAvailable() {
-    return (
-      typeof document.queryCommandSupported === 'function' && document.queryCommandSupported('copy')
-    );
+    if (clipboardAvailable === undefined) {
+      clipboardAvailable =
+        typeof document.queryCommandSupported === 'function' &&
+        document.queryCommandSupported('copy');
+    }
+    return clipboardAvailable;
   }
 
   static getString(): Promise<string> {