/**
 * Normalization utilities for labor ticket signatures.
 * Ensures consistent signatures regardless of API response format variations.
 */
/**
 * Normalize timestamps to consistent ISO format (handles Z vs +00:00 variations)
 */
export declare function normalizeTimestamp(ts: string | null | undefined): string | null;
/**
 * Normalize text values — null/undefined/empty-string all become null.
 * MM can flip between null and "" across API responses, so we treat them as equivalent.
 */
export declare function normalizeString(s: unknown): string | null;
/**
 * Normalize numbers — coerce strings to numbers, reject non-finite values.
 */
export declare function normalizeNumber(n: unknown): number | null;
/**
 * Normalize ID-like values (laborTicketRef, workOrderId, etc.) — always coerce to string.
 * Ensures "42" and 42 produce the same signature.
 */
export declare function normalizeLaborTicketRef(ref: unknown): string | null;
/**
 * Stable SQLite ledger key for labor tickets written from ERP → MM when `laborTicketRef`
 * is not yet known. Matches {@link tryLaborTicketLedgerErpImportKey} on the to-ERP path
 * so the first export cycle can dedupe against the post-import ledger row.
 */
export declare function tryLaborTicketLedgerErpImportKey(workOrderId: unknown, laborTicketId: unknown): string | null;
/**
 * Normalize reasons array for consistent signatures
 */
export declare function normalizeReasons(reasons: any[] | null | undefined): string[];
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