Fix TypeScript error: only include cost in providerMetadata when defined

Author: brandonkachen

packages/internal/src/openrouter-ai-sdk/chat/index.test.ts

@@ -913,8 +913,7 @@ describe('doStream', () => {
               completionTokens: 227,
               promptTokens: 17,
               totalTokens: 244,
-              cost: undefined,
-            } as { completionTokens: number; promptTokens: number; totalTokens: number; cost: number | undefined },
+            },
           },
         },
         usage: {
@@ -1282,8 +1281,7 @@ describe('doStream', () => {
               completionTokens: 17,
               promptTokens: 53,
               totalTokens: 70,
-              cost: undefined,
-            } as { completionTokens: number; promptTokens: number; totalTokens: number; cost: number | undefined },
+            },
           },
         },
         usage: {
@@ -1385,8 +1383,7 @@ describe('doStream', () => {
               completionTokens: 17,
               promptTokens: 53,
               totalTokens: 70,
-              cost: undefined,
-            } as { completionTokens: number; promptTokens: number; totalTokens: number; cost: number | undefined },
+            },
           },
         },
         usage: {

packages/internal/src/openrouter-ai-sdk/chat/index.ts

@@ -547,7 +547,9 @@ export class OpenRouterChatLanguageModel implements LanguageModelV2 {
                 }
               }
 
-              openrouterUsage.cost = value.usage.cost
+              if (value.usage.cost !== undefined) {
+                openrouterUsage.cost = value.usage.cost
+              }
               openrouterUsage.totalTokens = value.usage.total_tokens
             }
 

packages/internal/src/openrouter-ai-sdk/completion/index.test.ts

@@ -492,8 +492,7 @@ describe('doStream', () => {
               promptTokens: 10,
               completionTokens: 362,
               totalTokens: 372,
-              cost: undefined,
-            } as any,
+            },
           },
         },
         usage: {

packages/internal/src/openrouter-ai-sdk/completion/index.ts

@@ -301,7 +301,9 @@ export class OpenRouterCompletionLanguageModel implements LanguageModelV2 {
                 }
               }
 
-              openrouterUsage.cost = value.usage.cost
+              if (value.usage.cost !== undefined) {
+                openrouterUsage.cost = value.usage.cost
+              }
               openrouterUsage.totalTokens = value.usage.total_tokens
             }