# Summary How can I fix this typescript issue? I'm getting this error in the code below: `if ( typeof window !== "undefined" && "serviceWorker" in navigator && window.workbox !== undefined )` `Property 'workbox' does not exist on type 'Window & typeof globalThis'.ts(2339)` # Versions - `next-pwa`: ^5.6.0 - `next`: 13.5.6