fix: check for window's existance

src/dependencies.ts

@@ -52,18 +52,23 @@ export function hotjarInitScript(
   hotjarId: number,
   hotjarVersion: number
 ): boolean {
+  const hasWindow = typeof window !== 'undefined';
+
+  if (!hasWindow) return false;
+
   const hotjarScriptCode = `(function(h,o,t,j,a,r){h.hj=h.hj||function(){(h.hj.q=h.hj.q||[]).push(arguments)};h._hjSettings={hjid:${hotjarId},hjsv:${hotjarVersion}};a=o.getElementsByTagName('head')[0];r=o.createElement('script');r.async=1;r.src=t+h._hjSettings.hjid+j+h._hjSettings.hjsv;a.appendChild(r);})(window,document,'https://static.hotjar.com/c/hotjar-','.js?sv=');`;
   const isAppended = appendHeadScript(hotjarScriptCode, 'hotjar-init-script');
 
-  if (isAppended && window && window.hj) {
+  if (isAppended && hasWindow && window.hj) {
     return true;
   }
 
   throw Error('Hotjar initialization failed!');
 }
 
 export function hotjarStateChangeScript(relativePath: string): void {
-  if (window && window.hj) {
+  const hasWindow = typeof window !== 'undefined';
+  if (hasWindow && window.hj) {
     return window.hj('stateChange', relativePath);
   }
 
@@ -74,15 +79,17 @@ export function hotjarIdentifyScript(
   userId: string | null,
   userInfo: TUserInfo
 ): void {
-  if (window && window.hj) {
+  const hasWindow = typeof window !== 'undefined';
+  if (hasWindow && window.hj) {
     return window.hj('identify', userId, userInfo);
   }
 
   throw Error('Hotjar is not available! Is Hotjar initialized?');
 }
 
 export function checkReadyState(): boolean {
-  if (window && window.hj) {
+  const hasWindow = typeof window !== 'undefined';
+  if (hasWindow && window.hj) {
     return true;
   }