Reference run_worker_first in tutorial

Author: jamesopstad

src/content/docs/workers/vite-plugin/tutorial.mdx

@@ -147,12 +147,8 @@ The `main` field specifies the entry file for your Worker code.
 ### Add your API Worker
 
 ```ts title="worker/index.ts"
-interface Env {
-	ASSETS: Fetcher;
-}
-
 export default {
-	fetch(request, env) {
+	fetch(request) {
 		const url = new URL(request.url);
 
 		if (url.pathname.startsWith("/api/")) {
@@ -163,7 +159,7 @@ export default {
 
 		return new Response(null, { status: 404 });
 	},
-} satisfies ExportedHandler<Env>;
+} satisfies ExportedHandler;
 ```
 
 The Worker above will be invoked for any non-navigation request that does not match a static asset.
@@ -172,6 +168,21 @@ It returns a JSON response if the `pathname` starts with `/api/` and otherwise r
 :::note
 For top-level navigation requests, browsers send a `Sec-Fetch-Mode: navigate` header.
 If this is present and the URL does not match a static asset, the `not_found_handling` behavior will be invoked rather than the Worker.
+This implicit routing is the default behavior.
+
+If you would instead like to define the routes that invoke your Worker explicitly, you can provide an array of route patterns to [`run_worker_first`](/workers/static-assets/binding/#run_worker_first).
+This opts out of interpreting the `Sec-Fetch-Mode` header.
+
+<WranglerConfig>
+
+```toml
+name = "cloudflare-vite-tutorial"
+compatibility_date = "2025-04-03"
+assets = { not_found_handling = "single-page-application", run_worker_first = ["/api/*"] }
+main = "./worker/index.ts"
+```
+
+</WranglerConfig>
 :::
 
 ### Call the API from the client