chore: add middy like interfaces to commons package

packages/commons/src/index.ts

@@ -1,3 +1,4 @@
 export * from './utils/lambda';
+export * from './utils/middy';
 export * as ContextExamples from './tests/resources/contexts';
 export * as Events from './tests/resources/events';

packages/commons/src/utils/middy/MiddyInterfaces.ts

@@ -0,0 +1,19 @@
+import { Context } from 'aws-lambda';
+
+interface MiddyLikeRequest<TEvent = unknown, TResult = unknown, TErr = Error, TContext extends Context = Context> {
+  event: TEvent
+  context: TContext
+  response: TResult | null
+  error: TErr | null
+  internal: {
+    [key: string]: unknown
+  }
+}
+
+declare type MiddlewareFn<TEvent = unknown, TResult = unknown, TErr = Error, TContext extends Context = Context> = (request: MiddyLikeRequest<TEvent, TResult, TErr, TContext>) => unknown;
+
+export interface MiddyLikeMiddlewareObj<TEvent = unknown, TResult = unknown, TErr = Error, TContext extends Context = Context> {
+  before?: MiddlewareFn<TEvent, TResult, TErr, TContext>
+  after?: MiddlewareFn<TEvent, TResult, TErr, TContext>
+  onError?: MiddlewareFn<TEvent, TResult, TErr, TContext>
+}

packages/commons/src/utils/middy/index.ts

@@ -0,0 +1 @@
+export * from './MiddyInterfaces';