Add navigator global with userAgent property

.changeset/five-goats-hang.md

@@ -0,0 +1,5 @@
+---
+'nxjs-runtime': patch
+---
+
+Add `navigator` global with `userAgent` property

packages/runtime/src/fetch/fetch.ts

@@ -5,6 +5,7 @@ import { decoder } from '../polyfills/text-decoder';
 import { Request, type RequestInit } from './request';
 import { Response } from './response';
 import { Headers } from './headers';
+import { navigator } from '../navigator';
 import type { SwitchClass } from '../switch';
 
 declare const Switch: SwitchClass;
@@ -143,7 +144,7 @@ async function fetchHttp(req: Request, url: URL) {
 		req.headers.set('host', url.host);
 	}
 	if (!req.headers.has('user-agent')) {
-		req.headers.set('user-agent', `nx.js/${Switch.version.nxjs}`);
+		req.headers.set('user-agent', navigator.userAgent);
 	}
 	if (!req.headers.has('accept')) {
 		req.headers.set('accept', '*/*');

packages/runtime/src/index.ts

@@ -22,6 +22,7 @@ export type {
 export type { InspectOptions } from './inspect';
 export type * from './types';
 export type * from './console';
+export type * from './navigator';
 export type {
 	CanvasImageSource,
 	Canvas,
@@ -73,6 +74,8 @@ def('setInterval', setInterval);
 def('clearTimeout', clearTimeout);
 def('clearInterval', clearInterval);
 
+import './navigator';
+
 import * as WebAssembly from './wasm';
 def('WebAssembly', WebAssembly);
 

packages/runtime/src/navigator.ts

@@ -0,0 +1,33 @@
+import { def } from './utils';
+import type { SwitchClass } from './switch';
+
+declare const Switch: SwitchClass;
+
+/**
+ * The `Navigator` interface represents the state and the identity of the user agent.
+ * It allows scripts to query it and to register themselves to carry on some activities.
+ *
+ * A `Navigator` instance can be retrieved by accessing the global {@link navigator | `navigator`} property.
+ *
+ * @see https://developer.mozilla.org/docs/Web/API/Navigator
+ */
+export class Navigator {
+	constructor() {
+		throw new TypeError('Illegal constructor.');
+	}
+
+	/**
+	 * Returns the value used for the `User-Agent` HTTP request header for
+	 * HTTP requests initiated with {@link fetch | `fetch()`}.
+	 *
+	 * @example "my-app/0.0.1 (Switch; en-us; rv:14.1.2|AMS 1.5.4|E) nx.js/0.0.18"
+	 * @see https://developer.mozilla.org/docs/Web/API/Navigator/userAgent
+	 */
+	get userAgent(): string {
+		return `nx.js/${Switch.version.nxjs}`;
+	}
+}
+def('Navigator', Navigator);
+
+export const navigator: Navigator = Object.create(Navigator.prototype);
+def('navigator', navigator);