export interface DiffCacheSlot {
    cacheName: string;
    model: string;
    createdAt: number;
}
export declare function isDiffCacheEnabled(): boolean;
export declare function shouldCacheDiff(diffLength: number): boolean;
/**
 * Create a Gemini context cache containing the given diff text.
 * Returns the cache slot on success, or undefined on failure (logged).
 */
export declare function createDiffCache(diff: string, model?: string): Promise<DiffCacheSlot | undefined>;
/**
 * Returns the current diff cache slot if the model matches.
 * Falls back to undefined when:
 * - No cache exists
 * - The cache was created for a different model
 */
export declare function getCurrentDiffCache(model?: string): DiffCacheSlot | undefined;
/**
 * Delete the current diff cache from the Gemini API and clear local state.
 * Best-effort: errors are logged but not thrown.
 */
export declare function deleteDiffCache(): Promise<void>;
/** Clear local cache state without calling the API. */
export declare function clearDiffCacheLocal(): void;
/** Expose for testing. */
export declare function setDiffCacheForTesting(slot: DiffCacheSlot | undefined): void;