perf improvement

segmentio · Oct 24, 2022 · 3358219 · 3358219
1 parent 131e8f5
commit 3358219
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/packages/browser/src/core/user/index.ts b/packages/browser/src/core/user/index.ts
@@ -59,7 +59,12 @@ class Store {
 const ONE_YEAR = 365
 
 export class Cookie extends Store {
+  static _available: boolean | undefined
   static available(): boolean {
+    if (Cookie._available !== undefined) {
+      return Cookie._available
+    }
+
     let cookieEnabled = window.navigator.cookieEnabled
 
     if (!cookieEnabled) {
@@ -68,6 +73,8 @@ export class Cookie extends Store {
       jar.remove('ajs:cookies')
     }
 
+    Cookie._available = cookieEnabled
+
     return cookieEnabled
   }
 
@@ -137,13 +144,21 @@ export class Cookie extends Store {
 }
 
 export class LocalStorage extends Store {
+  static _available: boolean | undefined
+
   static available(): boolean {
+    if (LocalStorage._available !== undefined) {
+      return LocalStorage._available
+    }
+
     const test = 'test'
     try {
       localStorage.setItem(test, test)
       localStorage.removeItem(test)
+      LocalStorage._available = true
       return true
     } catch (e) {
+      LocalStorage._available = false
       return false
     }
   }