fix: avoid install installed plugin (#1214)

iamkun · Nov 23, 2020 · a92eb6c · a92eb6c
1 parent 34cfb92
commit a92eb6c
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/index.js b/src/index.js
@@ -387,7 +387,12 @@ dayjs.prototype = proto;
 })
 
 dayjs.extend = (plugin, option) => {
+  if (plugin.installed) {
+    return dayjs
+  }
+
   plugin(option, Dayjs, dayjs)
+  plugin.installed = true
   return dayjs
 }