fix some serviceworker methods

src/client/dom/open.ts

@@ -11,6 +11,8 @@ export default function (client: ScramjetClient) {
 
 			const realwin = ctx.fn.apply(ctx.this, ctx.args);
 
+			if (!realwin) return ctx.return(realwin);
+
 			if (ScramjetClient.SCRAMJET in realwin.self) {
 				return ctx.return(realwin.self[ScramjetClient.SCRAMJET].windowProxy);
 			} else {

src/client/dom/serviceworker.ts

@@ -38,6 +38,24 @@ export default function (client: ScramjetClient, self: Self) {
 		},
 	});
 
+	client.Proxy("navigator.serviceWorker.getRegistrations", {
+		apply(ctx) {
+			ctx.return(new Promise((resolve) => resolve([registration])));
+		},
+	});
+
+	client.Trap("navigator.serviceWorker.ready", {
+		get(ctx) {
+			return new Promise((resolve) => resolve(registration));
+		},
+	});
+
+	client.Trap("navigator.serviceWorker.controller", {
+		get(ctx) {
+			return registration.active;
+		},
+	});
+
 	client.Proxy("navigator.serviceWorker.register", {
 		apply(ctx) {
 			if (ctx.args[0] instanceof URL) ctx.args[0] = ctx.args[0].href;
@@ -77,6 +95,9 @@ export default function (client: ScramjetClient, self: Self) {
 						if (prop === "scope") {
 							return ctx.args[0];
 						}
+						if (prop === "unregister") {
+							return () => {};
+						}
 
 						if (prop === "addEventListener") {
 							return () => {};