support reasoning for openrouter

Author: narengogi

src/providers/openrouter/chatComplete.ts

@@ -10,7 +10,7 @@ import {
   generateErrorResponse,
   generateInvalidProviderResponseError,
 } from '../utils';
-import { transformReasoningParams } from './utils';
+import { transformReasoningParams, transformUsageOptions } from './utils';
 
 export const OpenrouterChatCompleteConfig: ProviderConfig = {
   model: {
@@ -82,6 +82,9 @@ export const OpenrouterChatCompleteConfig: ProviderConfig = {
   },
   usage: {
     param: 'usage',
+    transform: (params: Params) => {
+      return transformUsageOptions(params);
+    },
   },
   stream: {
     param: 'stream',
@@ -90,12 +93,7 @@ export const OpenrouterChatCompleteConfig: ProviderConfig = {
   stream_options: {
     param: 'usage',
     transform: (params: Params) => {
-      if (params.stream_options?.include_usage) {
-        return {
-          include: params.stream_options?.include_usage,
-        };
-      }
-      return null;
+      return transformUsageOptions(params);
     },
   },
   response_format: {

src/providers/openrouter/utils.ts

@@ -1,5 +1,9 @@
 import { Params } from '../../types/requestBody';
 
+interface OpenrouterUsageParam {
+  include?: boolean;
+}
+
 interface OpenRouterParams extends Params {
   reasoning?: OpenrouterReasoningParam;
 }
@@ -17,3 +21,11 @@ export const transformReasoningParams = (params: OpenRouterParams) => {
   }
   return Object.keys(reasoning).length > 0 ? reasoning : null;
 };
+
+export const transformUsageOptions = (params: OpenRouterParams) => {
+  let usage: OpenrouterUsageParam = { ...params.usage };
+  if (params.stream_options?.include_usage) {
+    usage.include = params.stream_options?.include_usage;
+  }
+  return Object.keys(usage).length > 0 ? usage : null;
+};