/** In-memory cache for Drive file IDs and metadata to reduce API round-trips. */
export interface FileCacheEntry {
    fileId: string;
    name: string;
    mimeType: string;
    revision: string;
    size: number;
    modifiedTime: string;
    cachedAt: number;
}
export declare class FileCache {
    private readonly byPath;
    private readonly byId;
    set(path: string, entry: FileCacheEntry): void;
    getByPath(path: string): FileCacheEntry | undefined;
    getById(fileId: string): FileCacheEntry | undefined;
    invalidate(fileId: string): void;
    invalidateAll(): void;
    size(): number;
}
export declare const fileCache: FileCache;
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