fix: re-add support for openapi-typescript 5 and 6 (#74)

package.json

@@ -51,12 +51,14 @@
     "defu": "^6.1.4",
     "ofetch": "^1.3.4",
     "ohash": "^1.1.3",
-    "openapi-typescript": "^7.0.0-next.10",
     "openapi-typescript-helpers": "^0.0.8",
     "pathe": "^1.1.2",
     "scule": "^1.3.0",
     "ufo": "^1.5.3"
   },
+  "peerDependencies": {
+    "openapi-typescript": "^5 || ^6 || ^7"
+  },
   "devDependencies": {
     "@nuxt/eslint-config": "^0.3.9",
     "@nuxt/module-builder": "^0.5.5",

src/openapi.ts

@@ -1,8 +1,15 @@
 import { resolve } from 'pathe'
 import { useNuxt } from '@nuxt/kit'
 import type { OpenAPI3, OpenAPITSOptions } from 'openapi-typescript'
+import openAPITS, { astToString } from 'openapi-typescript'
 import type { ApiEndpoint } from './module'
 
+declare module 'openapi-typescript' {
+  // exists in openapi-typescript@7
+  function _astToString(ast: unknown): string
+  export const astToString: typeof _astToString | undefined
+}
+
 export async function generateDeclarationTypes(
   endpoints: Record<string, ApiEndpoint>,
   globalOpenAPIOptions: OpenAPITSOptions,
@@ -29,15 +36,18 @@ async function generateSchemaTypes(options: {
   openAPITSOptions?: OpenAPITSOptions
 },
 ) {
-  const { default: openAPITS, astToString } = await import('openapi-typescript')
   const schema = await resolveSchema(options.endpoint)
 
   try {
     const ast = await openAPITS(schema, {
       ...options.openAPITSOptions,
       ...options.endpoint.openAPITS,
     })
-    return astToString(ast)
+    if (typeof ast !== 'string') {
+      // openapi-typescript 7
+      return astToString!(ast)
+    }
+    return ast
   }
   catch (error) {
     console.error(`Failed to generate types for ${options.id}`)