REST API speed improvement (#1577)

src/client/WebhookClient.js

@@ -34,13 +34,6 @@ class WebhookClient extends Webhook {
      */
     this.rest = new RESTManager(this);
 
-    /**
-     * API shortcut
-     * @type {Object}
-     * @private
-     */
-    this.api = this.rest.api;
-
     /**
      * The data resolver of the client
      * @type {ClientDataResolver}
@@ -63,6 +56,15 @@ class WebhookClient extends Webhook {
     this._intervals = new Set();
   }
 
+  /**
+   * API shortcut
+   * @type {Object}
+   * @private
+   */
+  get api() {
+    return this.rest.api;
+  }
+
   /**
    * Sets a timeout that will be automatically cancelled if the client is destroyed.
    * @param {Function} fn Function to execute