Add openapi.yaml support (#119)

package.json

@@ -93,6 +93,7 @@
   "dependencies": {
     "@asteasolutions/zod-to-openapi": "^5.3.1",
     "itty-router": "4.0.26",
+    "js-yaml": "^4.1.0",
     "openapi3-ts": "^4.1.2",
     "zod": "^3.21.4"
   }

src/openapi.ts

@@ -16,6 +16,7 @@ import { OpenAPIRegistryMerger } from './zod/registry'
 import { z } from 'zod'
 import { OpenAPIObject } from 'openapi3-ts/oas31'
 import { OpenAPIRoute } from './route'
+const yaml = require('js-yaml')
 
 export type Route = <
   RequestType = IRequest,
@@ -240,6 +241,18 @@ export function OpenAPIRouter<
         status: 200,
       })
     })
+
+    router.get(
+      (options?.openapi_url || '/openapi.json').replace('.json', '.yaml'),
+      () => {
+        return new Response(yaml.dump(getGeneratedSchema()), {
+          headers: {
+            'content-type': 'text/yaml;charset=UTF-8',
+          },
+          status: 200,
+        })
+      }
+    )
   }
 
   if (options?.aiPlugin && options?.openapi_url !== null) {