feat(util-create-request): create request package (#257)

Author: AllanZhengYP

packages/types/src/command.ts

@@ -37,6 +37,7 @@ export interface Command<
 > {
   readonly input: InputType;
   readonly model: OperationModel;
+  readonly middlewareStack: MiddlewareStack<InputType, OutputType, StreamType>;
   resolveMiddleware(
     stack: MiddlewareStack<ClientInput, ClientOutput, StreamType>,
     configuration: ResolvedConfiguration

packages/types/src/middleware.ts

@@ -269,6 +269,14 @@ export interface MiddlewareStack<
    */
   clone(): MiddlewareStack<Input, Output, Stream>;
 
+  /**
+   * same to clone, but only filter in middlewares when evaluation callback
+   * function returns true.
+   */
+  filter(
+    callbackfn: (middlewareStats: HandlerOptions) => boolean
+  ): MiddlewareStack<Input, Output, Stream>;
+
   /**
    * Create a list containing the middlewares in this list as well as the
    * middlewares in the `from` list. Neither source is modified, and step