Merge pull request #26 from tamo/sw-unavailable

Output error when navigator.serviceWorker is unavailable

Author: gzuidhof

coi-serviceworker.js

@@ -115,29 +115,32 @@ if (typeof window === 'undefined') {
             return;
         }
 
-        // In some environments (e.g. Chrome incognito mode) this won't be available
-        if (n.serviceWorker) {
-            n.serviceWorker.register(window.document.currentScript.src).then(
-                (registration) => {
-                    !coi.quiet && console.log("COOP/COEP Service Worker registered", registration.scope);
-
-                    registration.addEventListener("updatefound", () => {
-                        !coi.quiet && console.log("Reloading page to make use of updated COOP/COEP Service Worker.");
-                        window.sessionStorage.setItem("coiReloadedBySelf", "updatefound");
-                        coi.doReload();
-                    });
+        // In some environments (e.g. Firefox private mode) this won't be available
+        if (!n.serviceWorker) {
+            !coi.quiet && console.error("COOP/COEP Service Worker not registered, perhaps due to private mode.");
+            return;
+        }
 
-                    // If the registration is active, but it's not controlling the page
-                    if (registration.active && !n.serviceWorker.controller) {
-                        !coi.quiet && console.log("Reloading page to make use of COOP/COEP Service Worker.");
-                        window.sessionStorage.setItem("coiReloadedBySelf", "notcontrolling");
-                        coi.doReload();
-                    }
-                },
-                (err) => {
-                    !coi.quiet && console.error("COOP/COEP Service Worker failed to register:", err);
+        n.serviceWorker.register(window.document.currentScript.src).then(
+            (registration) => {
+                !coi.quiet && console.log("COOP/COEP Service Worker registered", registration.scope);
+
+                registration.addEventListener("updatefound", () => {
+                    !coi.quiet && console.log("Reloading page to make use of updated COOP/COEP Service Worker.");
+                    window.sessionStorage.setItem("coiReloadedBySelf", "updatefound");
+                    coi.doReload();
+                });
+
+                // If the registration is active, but it's not controlling the page
+                if (registration.active && !n.serviceWorker.controller) {
+                    !coi.quiet && console.log("Reloading page to make use of COOP/COEP Service Worker.");
+                    window.sessionStorage.setItem("coiReloadedBySelf", "notcontrolling");
+                    coi.doReload();
                 }
-            );
-        }
+            },
+            (err) => {
+                !coi.quiet && console.error("COOP/COEP Service Worker failed to register:", err);
+            }
+        );
     })();
 }