fix: allow null values for prompt_tokens_details and completion_tokens_details (#75)

* fix: allow null values for prompt_tokens_details and completion_tokens_details

Fixes #73 where OpenRouter API returns null for prompt_tokens_details and
completion_tokens_details but schema validation only allowed object or undefined.
Changed .optional() to .nullish() to accept null, undefined, or object values.

Co-Authored-By: Louis   <[email protected]>

* chore: bump version to 0.7.1

Co-Authored-By: Louis   <[email protected]>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Louis <[email protected]>

Author: devin-ai-integration[bot]

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/ai-sdk-provider",
-  "version": "0.7.0",
+  "version": "0.7.1",
   "license": "Apache-2.0",
   "sideEffects": false,
   "main": "./dist/index.js",

src/openrouter-chat-language-model.ts

@@ -733,13 +733,13 @@ const OpenRouterChatCompletionBaseResponseSchema = z.object({
         .object({
           cached_tokens: z.number(),
         })
-        .optional(),
+        .nullish(),
       completion_tokens: z.number(),
       completion_tokens_details: z
         .object({
           reasoning_tokens: z.number(),
         })
-        .optional(),
+        .nullish(),
       total_tokens: z.number(),
       cost: z.number().optional(),
     })