fix(router): make router handler non preemtive by default (#194)

src/app.ts

@@ -114,7 +114,10 @@ export function createAppEventHandler (stack: Stack, options: AppOptions) {
       }
     }
     if (!event.res.writableEnded) {
-      throw createError({ statusCode: 404, statusMessage: 'Not Found' })
+      throw createError({
+        statusCode: 404,
+        statusMessage: `Cannot find any route matching ${event.req.url || '/'}.`
+      })
     }
   })
 }

src/router.ts

@@ -19,7 +19,11 @@ interface RouteNode {
   handlers: Partial<Record<RouterMethod | 'all', EventHandler>>
 }
 
-export function createRouter (): Router {
+export interface CreateRouterOptions {
+  preemtive?: boolean
+}
+
+export function createRouter (opts: CreateRouterOptions = {}): Router {
   const _router = _createRouter<RouteNode>({})
   const routes: Record<string, RouteNode> = {}
 
@@ -57,13 +61,16 @@ export function createRouter (): Router {
     }
 
     const matched = _router.lookup(path)
-
     if (!matched) {
-      throw createError({
-        statusCode: 404,
-        name: 'Not Found',
-        statusMessage: `Cannot find any route matching ${event.req.url || '/'}.`
-      })
+      if (opts.preemtive) {
+        throw createError({
+          statusCode: 404,
+          name: 'Not Found',
+          statusMessage: `Cannot find any route matching ${event.req.url || '/'}.`
+        })
+      } else {
+        return // Let app match other handlers
+      }
     }
 
     // Match method

test/router.test.ts

@@ -25,6 +25,19 @@ describe('router', () => {
     expect(res.text).toEqual('Hello')
   })
 
+  it('Multiple Routers', async () => {
+    const secondRouter = createRouter()
+      .add('/router2', eventHandler(() => 'router2'))
+
+    app.use(secondRouter)
+
+    const res1 = await request.get('/')
+    expect(res1.text).toEqual('Hello')
+
+    const res2 = await request.get('/router2')
+    expect(res2.text).toEqual('router2')
+  })
+
   it('Handle different methods', async () => {
     const res1 = await request.get('/test')
     expect(res1.text).toEqual('Test (GET)')