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src/Components/PhotoList.tsx

···
   let filterType: FilterType = FilterType.USER;
   let filter = '';
 
-  let os = "unknown";
-  (async () => {
-    os = await invoke('get_os');
-  })();
-
   let filteredPhotos: Photo[] = [];
 
   let closeWithKey = ( e: KeyboardEvent ) => {
···
       this.imageEl = document.createElement('img');
       this.imageEl.crossOrigin = 'anonymous';
 
-      this.imageEl.src = os === "windows" ? "http://photo.localhost/" : "photo://localhost" + photoPath + this.path + "?downscale";
+      this.imageEl.src = (window.OS === "windows" ? "http://photo.localhost/" : "photo://localhost") + photoPath + this.path + "?downscale";
 
       this.imageEl.onload = () => {
         this.image!.width = this.scaledWidth!;

src/Components/PhotoViewer.tsx

···
           if(!photoPath)
             photoPath = await invoke('get_user_photos_path') + '/';
 
-          imageViewer.src = await invoke('get_os') === "windows" ? "http://photo.localhost/" : 'photo://localhost' + (photoPath + props.currentPhotoView().path).split('\\').join('/') + "?full";
+          imageViewer.src = (window.OS === "windows" ? "http://photo.localhost/" : 'photo://localhost') + (photoPath + props.currentPhotoView().path).split('\\').join('/') + "?full";
           imageViewer.crossOrigin = 'anonymous';
         })();
 

src/index.tsx

···
 declare global{
   interface Window {
     CloseAllPopups: (() => void)[]
+    OS: string;
   }
 }
 
···
 
 import "./styles.css";
 import App from "./Components/App";
-
-render(() => <App />, document.getElementById("root") as HTMLElement);
+import { invoke } from "@tauri-apps/api/core";
 
-let f =  new FontFace('Rubik', 'url(https://cdn.phaz.uk/fonts/rubik/Rubik-VariableFont_wght.ttf)');
+(async () => {
+  window.OS = await invoke('get_os');
 
-f.load().then((font) => {
-  document.fonts.add(font);
-});
+  render(() => <App />, document.getElementById("root") as HTMLElement);
+  
+  let f =  new FontFace('Rubik', 'url(https://cdn.phaz.uk/fonts/rubik/Rubik-VariableFont_wght.ttf)');
+  
+  f.load().then((font) => {
+    document.fonts.add(font);
+  });
+})();