/**
 * StrictDB — Automatic Timestamp Injection
 *
 * Pure utility functions for injecting created_at / updated_at timestamps.
 * Immutable — always returns new objects, never mutates input.
 */
import type { TimestampFieldNames } from './types.js';
export interface ResolvedTimestampConfig {
    enabled: boolean;
    createdAt: string;
    updatedAt: string;
}
/**
 * Resolve user-provided timestamp config into a normalized form.
 */
export declare function resolveTimestampConfig(config?: boolean | TimestampFieldNames): ResolvedTimestampConfig;
/**
 * Inject created_at and updated_at into an insert document.
 * User-provided values are preserved (never overwritten).
 */
export declare function injectInsertTimestamps<T extends Record<string, unknown>>(doc: T, config: ResolvedTimestampConfig, now?: Date): T;
/**
 * Inject updated_at into an update operation's $set.
 * User-provided values in $set are preserved. Never adds created_at on updates.
 */
export declare function injectUpdateTimestamps<T extends Record<string, unknown>>(update: T, config: ResolvedTimestampConfig, now?: Date): T;
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