/**
* Copyright 2025 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import type { CacheControlEphemeral } from '@anthropic-ai/sdk/resources/messages';
/**
* Creates a cache control metadata object for prompt caching.
* Returns `{ cache_control: ... }` so it can be spread into metadata.
*
* @param options - Cache control options. Type defaults to 'ephemeral'.
* @returns Object with cache_control property to spread into part metadata.
*
* @example
* ```ts
* import { anthropic, cacheControl } from '@genkit-ai/anthropic';
*
* const response = await ai.generate({
* model: anthropic.model('claude-sonnet-4-5'),
* system: {
* text: longSystemPrompt,
* metadata: { ...cacheControl() } // default ephemeral
* },
* messages: [{ role: 'user', content: [{ text: 'Hello' }] }]
* });
*
* // Or with explicit TTL:
* metadata: { ...cacheControl({ ttl: '1h' }) }
* ```
*/
export function cacheControl(options?: Partial<CacheControlEphemeral>): {
cache_control: CacheControlEphemeral;
} {
return {
cache_control: {
type: options?.type ?? 'ephemeral',
...(options?.ttl && { ttl: options.ttl }),
},
};
}
export function removeUndefinedProperties<T>(obj: T): T {
if (typeof obj !== 'object' || obj === null) {
return obj;
}
return Object.fromEntries(
Object.entries(obj).filter(([_, value]) => value !== undefined)
) as T;
}
