fix/unbound fetch

dist/web/pubnub.js

@@ -6272,8 +6272,12 @@
 	        // no `document`, and `fetch` cannot be reached through a fresh browsing context — return the context `fetch`
 	        // directly. This is safe there: without a DOM there is no APM page script to monkey patch `fetch` in the
 	        // first place. This environment check is what keeps the unconditional call in the constructor safe.
+	        //
+	        // `fetch` must be bound to the global scope: native `fetch` requires its `this` to be the `Window` /
+	        // `WorkerGlobalScope`, and it is later invoked detached (`WebTransport.originalFetch(...)`). Without the bind
+	        // a service worker throws "Failed to execute 'fetch' on 'WorkerGlobalScope': Illegal invocation".
 	        if (typeof document === 'undefined' || !document.body)
-	            return fetch;
+	            return fetch.bind(globalThis);
 	        let iframe = document.querySelector('iframe[name="pubnub-context-unpatched-fetch"]');
 	        if (!iframe) {
 	            iframe = document.createElement('iframe');
@@ -6284,7 +6288,7 @@
 	        }
 	        if (iframe.contentWindow)
 	            return iframe.contentWindow.fetch.bind(iframe.contentWindow);
-	        return fetch;
+	        return fetch.bind(globalThis);
 	    }
 	}
 	/**

src/transport/web-transport.ts

@@ -444,7 +444,11 @@ export class WebTransport implements Transport {
     // no `document`, and `fetch` cannot be reached through a fresh browsing context — return the context `fetch`
     // directly. This is safe there: without a DOM there is no APM page script to monkey patch `fetch` in the
     // first place. This environment check is what keeps the unconditional call in the constructor safe.
-    if (typeof document === 'undefined' || !document.body) return fetch;
+    //
+    // `fetch` must be bound to the global scope: native `fetch` requires its `this` to be the `Window` /
+    // `WorkerGlobalScope`, and it is later invoked detached (`WebTransport.originalFetch(...)`). Without the bind
+    // a service worker throws "Failed to execute 'fetch' on 'WorkerGlobalScope': Illegal invocation".
+    if (typeof document === 'undefined' || !document.body) return fetch.bind(globalThis);
 
     let iframe = document.querySelector<HTMLIFrameElement>('iframe[name="pubnub-context-unpatched-fetch"]');
 
@@ -457,6 +461,6 @@ export class WebTransport implements Transport {
     }
 
     if (iframe.contentWindow) return iframe.contentWindow.fetch.bind(iframe.contentWindow);
-    return fetch;
+    return fetch.bind(globalThis);
   }
 }