better handling of window global

package.json

@@ -89,6 +89,7 @@
     "@storybook/theming": "8.4.1",
     "@tsconfig/node22": "22.0.0",
     "@tsconfig/strictest": "2.0.5",
+    "@types/defined": "1.0.2",
     "@types/node": "22.8.6",
     "@types/superagent": "8.1.9",
     "@types/ua-parser-js": "0.7.39",

src/resource.ts

@@ -8,13 +8,14 @@ import Response from "superagent/lib/node/response";
 import VideomailError from "./util/error/VideomailError";
 import { FormInputs, FormMethod } from "./wrappers/form";
 
-const timezoneId = window.Intl.DateTimeFormat().resolvedOptions().timeZone;
-
 class Resource {
   private readonly options: VideomailClientOptions;
+  private readonly timezoneId: string;
 
   constructor(options: VideomailClientOptions) {
     this.options = options;
+
+    this.timezoneId = window.Intl.DateTimeFormat().resolvedOptions().timeZone;
   }
 
   private applyDefaultValue(videomail: PartialVideomail, name: string) {
@@ -45,7 +46,7 @@ class Resource {
       const request = await superagent("get", url)
         .type("json")
         .set("Accept", "application/json")
-        .set("Timezone-Id", timezoneId)
+        .set("Timezone-Id", this.timezoneId)
         .set(Constants.SITE_NAME_LABEL, this.options.siteName)
         .timeout(this.options.timeouts.connection);
 
@@ -69,7 +70,7 @@ class Resource {
     try {
       const request = await superagent(method, url)
         .query(queryParams)
-        .set("Timezone-Id", timezoneId)
+        .set("Timezone-Id", this.timezoneId)
         .send(videomail)
         .timeout(this.options.timeouts.connection);
 
@@ -158,7 +159,7 @@ class Resource {
       const res = await superagent
         .post(url)
         .type(formType)
-        .set("Timezone-Id", timezoneId)
+        .set("Timezone-Id", this.timezoneId)
         .send(formData)
         .timeout(this.options.timeouts.connection);
 

src/util/Browser.ts

@@ -16,11 +16,7 @@ class Browser {
   public constructor(options: VideomailClientOptions) {
     this.options = options;
 
-    const ua = defined(
-      options.fakeUaString,
-      typeof window !== "undefined" && window.navigator.userAgent,
-      "",
-    );
+    const ua = defined(options.fakeUaString, window.navigator.userAgent, "");
 
     const userAgentParser = new UAParser(ua);