Fix type errors in prompt-caching examples with @ts-expect-error

Add FIXME comments noting that providerMetadata.openrouter.usage should be
properly typed as OpenRouterUsage instead of JSONValue.

Author: subtleGradient

typescript/ai-sdk-v5/src/prompt-caching/anthropic-multi-message-cache.ts

@@ -69,7 +69,9 @@ async function main() {
       ],
     });
 
+    // FIXME: providerMetadata.openrouter.usage should have proper type with promptTokensDetails
     const cached1 =
+      // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
       result1.providerMetadata?.openrouter?.usage?.promptTokensDetails?.cachedTokens ?? 0;
     console.log(`  Response: ${result1.text.substring(0, 80)}...`);
     console.log(`  cached_tokens=${cached1}`);
@@ -110,7 +112,9 @@ async function main() {
       ],
     });
 
+    // FIXME: providerMetadata.openrouter.usage should have proper type with promptTokensDetails
     const cached2 =
+      // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
       result2.providerMetadata?.openrouter?.usage?.promptTokensDetails?.cachedTokens ?? 0;
     console.log(`  Response: ${result2.text.substring(0, 80)}...`);
     console.log(`  cached_tokens=${cached2}`);

typescript/ai-sdk-v5/src/prompt-caching/anthropic-no-cache-control.ts

@@ -59,7 +59,9 @@ async function main() {
       ],
     });
 
+    // FIXME: providerMetadata.openrouter.usage should have proper type with promptTokensDetails
     const cached1 =
+      // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
       result1.providerMetadata?.openrouter?.usage?.promptTokensDetails?.cachedTokens ?? 0;
     console.log(`  cached_tokens=${cached1}`);
 
@@ -87,7 +89,9 @@ async function main() {
       ],
     });
 
+    // FIXME: providerMetadata.openrouter.usage should have proper type with promptTokensDetails
     const cached2 =
+      // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
       result2.providerMetadata?.openrouter?.usage?.promptTokensDetails?.cachedTokens ?? 0;
     console.log(`  cached_tokens=${cached2}`);
 

typescript/ai-sdk-v5/src/prompt-caching/anthropic-user-message-cache.ts

@@ -81,8 +81,11 @@ async function main() {
 
     console.log('  Response:', result1.text.substring(0, 100) + '...');
     const usage1 = result1.providerMetadata?.openrouter?.usage;
+    // FIXME: providerMetadata.openrouter.usage should have proper type with promptTokensDetails, promptTokens, completionTokens
+    // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
     const cached1 = usage1?.promptTokensDetails?.cachedTokens ?? 0;
     console.log(
+      // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
       `  Tokens: prompt=${usage1?.promptTokens}, completion=${usage1?.completionTokens}, cached=${cached1}`,
     );
 
@@ -117,8 +120,11 @@ async function main() {
 
     console.log('  Response:', result2.text.substring(0, 100) + '...');
     const usage2 = result2.providerMetadata?.openrouter?.usage;
+    // FIXME: providerMetadata.openrouter.usage should have proper type with promptTokensDetails, promptTokens, completionTokens
+    // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
     const cached2 = usage2?.promptTokensDetails?.cachedTokens ?? 0;
     console.log(
+      // @ts-expect-error - usage is typed as JSONValue but should be OpenRouterUsage
       `  Tokens: prompt=${usage2?.promptTokens}, completion=${usage2?.completionTokens}, cached=${cached2}`,
     );