feat: export getHonoContext (#884)

following #852, this should be more explicit. Still unstable, but less
experimental.

packages/waku/src/lib/hono/runner.ts

@@ -1,9 +1,10 @@
-import type { MiddlewareHandler } from 'hono';
+import type { Context, MiddlewareHandler } from 'hono';
 
+import { unstable_getCustomContext } from '../../server.js';
 import { resolveConfig } from '../config.js';
 import type { HandlerContext, MiddlewareOptions } from '../middleware/types.js';
 
-// Experimental Unstable API
+// Internal context key
 const HONO_CONTEXT = '__hono_context';
 
 const createEmptyReadableStream = () =>
@@ -13,6 +14,7 @@ const createEmptyReadableStream = () =>
     },
   });
 
+// Middleware runner (Is there a better name?)
 export const runner = (options: MiddlewareOptions): MiddlewareHandler => {
   const entriesPromise =
     options.cmd === 'start'
@@ -68,3 +70,11 @@ export const runner = (options: MiddlewareOptions): MiddlewareHandler => {
     await next();
   };
 };
+
+export const getHonoContext = <C extends Context = Context>() => {
+  const c = unstable_getCustomContext()[HONO_CONTEXT];
+  if (!c) {
+    throw new Error('Hono context is not available');
+  }
+  return c as C;
+};

packages/waku/src/unstable_hono.ts

@@ -1,6 +1,6 @@
 // These exports are for internal use only and subject to change without notice.
 
-export { runner } from './lib/hono/runner.js';
+export { runner, getHonoContext } from './lib/hono/runner.js';
 
 export const importHono = () => import('hono');
 export const importHonoNodeServer: any = () => import('@hono/node-server');