add example

packages/astro/src/types/public/internal.ts

@@ -52,8 +52,18 @@ export interface RouteData {
 	 */
 	component: string;
 	/**
-	 * TBD
-	 * @param data
+	 * @param {any} data The optional parameters of the route
+	 * 
+	 * @description
+	 * A function that accepts a list of params, interpolates them with the route pattern, and returns the path name of the route.
+	 * 
+	 * ## Example
+	 * 
+	 * For a route such as `/blog/[...id].astro`, the `generate` function would return something like this:
+	 * 
+	 * ```js
+	 * console.log(generate({ id: 'presentation' })) // will log `/blog/presentation` 
+	 * ```
 	 */
 	generate: (data?: any) => string;
 	/**