feat: expose nodeHandler and add backward compat with layer as handle

Author: pi0

src/app.ts

@@ -20,9 +20,9 @@ export interface InputLayer {
   match?: Matcher
   handler: Handler | LazyHandler
   lazy?: boolean
-  /**
-   * @deprecated
-   */
+  /** @deprecated */
+  handle?: Handler
+  /** @deprecated */
   promisify?: boolean
 }
 
@@ -41,6 +41,7 @@ export type NodeHandler = (req: http.IncomingMessage, res: http.ServerResponse)
 export interface App extends NodeHandler {
   stack: Stack
   handler: EventHandler
+  nodeHandler: NodeHandler
   use: AppUse
 }
 
@@ -67,6 +68,7 @@ export function createApp (options: AppOptions = {}): App {
   }
 
   const app = nodeHandler as App
+  app.nodeHandler = nodeHandler
   app.stack = stack
   app.handler = handler
 
@@ -139,7 +141,7 @@ export function createAppEventHandler (stack: Stack, options: AppOptions) {
 }
 
 function normalizeLayer (input: InputLayer) {
-  let handler = input.handler
+  let handler = input.handler || input.handle
   // @ts-ignore
   if (handler.handler) {
     // @ts-ignore

src/handler.ts

@@ -28,7 +28,7 @@ export function callHandler (handler: Middleware, req: IncomingMessage, res: Ser
   })
 }
 
-export function defineLazyHandler (handler: LazyHandler, promisify?: boolean): PromisifiedHandler {
+export function defineLazyHandler (handler: LazyHandler, promisify?: boolean): Handler {
   let _promise: Promise<Handler>
   const resolve = () => {
     if (!_promise) {
@@ -45,7 +45,7 @@ export function defineLazyHandler (handler: LazyHandler, promisify?: boolean): P
 /** @deprecated Use defineLazyHandler */
 export const lazyHandle = defineLazyHandler
 
-export function useBase (base: string, handler: PromisifiedHandler): PromisifiedHandler {
+export function useBase (base: string, handler: Handler): Handler {
   base = withoutTrailingSlash(base)
   if (!base) { return handler }
   return function (req, res) {