feat: type nitro app runtime hooks (#1316)

src/runtime/app.ts

@@ -16,6 +16,7 @@ import {
   createFetch as createLocalFetch,
 } from "unenv/runtime/fetch/index";
 import { createHooks, Hookable } from "hookable";
+import { NitroRuntimeHooks } from "../types";
 import { useRuntimeConfig } from "./config";
 import { cachedEventHandler } from "./cache";
 import { createRouteRulesHandler, getRouteRulesForPath } from "./route-rules";
@@ -26,16 +27,15 @@ import { handlers } from "#internal/nitro/virtual/server-handlers";
 export interface NitroApp {
   h3App: H3App;
   router: Router;
-  // TODO: Type hooks and allow extending
-  hooks: Hookable;
+  hooks: Hookable<NitroRuntimeHooks>;
   localCall: ReturnType<typeof createCall>;
   localFetch: ReturnType<typeof createLocalFetch>;
 }
 
 function createNitroApp(): NitroApp {
   const config = useRuntimeConfig();
 
-  const hooks = createHooks();
+  const hooks = createHooks<NitroRuntimeHooks>();
 
   const h3App = createApp({
     debug: destr(process.env.DEBUG),

src/runtime/types.ts

@@ -1,3 +1,6 @@
+import type { H3Event } from "h3";
+
+import type { RenderResponse } from "../types";
 export type { NitroApp } from "./app";
 export type {
   CacheEntry,
@@ -16,3 +19,11 @@ declare module "h3" {
     $fetch: typeof globalThis.fetch;
   }
 }
+
+export interface NitroRuntimeHooks {
+  "render:response": (
+    response: Partial<RenderResponse>,
+    context: { event: H3Event }
+  ) => void;
+  close: () => void;
+}