/**
 * Synonym dictionary for heuristic column mapping.
 * Harvested from existing broker adapters.
 */
import type { StandardField } from './types';
export declare const SYNONYMS: Record<StandardField, string[]>;
/**
 * Aggressively normalizes a header for matching: trim, strip BOM, lowercase, remove
 * spaces/dots/underscores so "Open Price" and "OpenPrice" match.
 */
export declare function normalizeHeader(h: string): string;
/** Check if a header matches a synonym (both normalized the same way). */
export declare function headerMatchesSynonym(header: string, synonym: string): boolean;