import type { FolderName, OpfsKey } from './types.js';
export interface OpfsMetadataCacheEntry {
    fullSize: number;
    type: string;
    folderName?: string;
    url?: string;
    etag?: string;
    lastModified?: string;
    evictable?: boolean;
}
export interface MetadataCacheLimits {
    maxEntries?: number;
    onEvictKey?: (key: OpfsKey) => void;
}
export declare class MetadataCacheImpl {
    private readonly cache;
    constructor(limits?: MetadataCacheLimits);
    get(key: OpfsKey): OpfsMetadataCacheEntry | undefined;
    set(key: OpfsKey, entry: OpfsMetadataCacheEntry): void;
    invalidateKeys(keys: Iterable<OpfsKey>): void;
    invalidateEntriesByFolder(folderName: FolderName): void;
    getEntriesByFolder(folderName: FolderName): IterableIterator<[OpfsKey, OpfsMetadataCacheEntry]>;
    invalidateAll(): void;
}
export declare function getOrCreateMetadataCache(folderName: FolderName, limits?: MetadataCacheLimits): MetadataCacheImpl;
export declare function getMetadataCache(): MetadataCacheImpl | null;