/**
 * Generate content-based unique key for a dataset item
 *
 * This function creates a deterministic hash by combining:
 * - The request's uniqueKey from Crawlee (ensures items from same request can be distinguished)
 * - The dataset item content (full or selected fields)
 *
 * Formula:
 * - With uniqueKeySelector: hash(requestUniqueKey + sorted(selectedFields))
 * - Without uniqueKeySelector: hash(requestUniqueKey + sorted(datasetItem))
 *
 * @param datasetItem - The scraped data item
 * @param requestUniqueKey - The request's unique key from Crawlee
 * @param uniqueKeySelector - Optional array of field names to use for unique key generation
 * @returns A SHA-256 hash combining request and content
 */
export declare function generateUniqueKey(datasetItem: any, requestUniqueKey: string, uniqueKeySelector?: string[]): string;
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