fix: add support for empty responses

Author: maxholman

__tests__/example.test.ts

@@ -185,6 +185,10 @@ describe('Example', () => {
       .addOperation(HttpMethods.HEAD, {
         operationId: 'checkUserIdAvailableCommand',
         security: noSecurityRequirement,
+        responses: {
+          204: new Response(api, 'HeadUserResponseFound'),
+          404: new Response(api, 'HeadUserResponseNotFound'),
+        },
       })
       .addOperation(HttpMethods.POST, {
         operationId: 'updateUserCommand',

lib/response.ts

@@ -4,31 +4,35 @@ import type { Header } from './header.js';
 import { MediaType, type MediaTypeOptions } from './media-type.js';
 
 interface ResponseOptions {
-  content: MediaType | MediaTypeOptions;
+  content?: MediaType | MediaTypeOptions;
   description?: string;
   headers?: Header[];
 }
 
 export class Response extends Construct {
   private options: ResponseOptions;
 
-  private content: MediaType;
+  private content?: MediaType | undefined;
 
-  constructor(scope: Construct, id: string, options: ResponseOptions) {
+  constructor(scope: Construct, id: string, options: ResponseOptions = {}) {
     super(scope, id);
     this.options = options;
 
-    this.content =
-      options.content instanceof MediaType
-        ? options.content
-        : new MediaType(this, `${id}MediaType`, options.content);
+    if (options.content) {
+      this.content =
+        options.content instanceof MediaType
+          ? options.content
+          : new MediaType(this, `${id}MediaType`, options.content);
+    }
   }
 
   public synth(): OpenAPIV3_1.ResponseObject {
     return {
       description: this.options.description || '',
       content: {
-        [this.options.content.contentType]: this.content.synth(),
+        ...(this.content && {
+          [this.content.contentType]: this.content.synth(),
+        }),
       },
     };
   }