/**
 * UDP Shared Helpers — single source of truth for utility functions.
 *
 * Used by both frontend and backend.
 *
 * @module udp-schema/helpers
 */
/**
 * Calculate age from an ISO date string (YYYY-MM-DD or Date-parseable).
 *
 * @returns Age in years, or null if invalid.
 */
export declare function calcAge(dob: string | Date | undefined | null): number | null;
/**
 * Check if a field should be visible based on its `conditionalOn` rule.
 *
 * Looks up the field's metadata from profile-fields. If it has a `conditionalOn`
 * property, checks if the controlling field's current value is in the allowed list.
 *
 * @param fieldKey - The field to check visibility for
 * @param form - Current form data (flat key-value object)
 * @returns true if the field should be shown (no condition, or condition met)
 */
export declare function isFieldVisible(fieldKey: string, form: Record<string, unknown>): boolean;
/**
 * Resolve a single-select field's current value to its display label.
 *
 * Uses getFieldOptions() from profile-fields for O(1) option lookup.
 * Falls back to the raw value if no option found.
 *
 * @param fieldKey - The field key (e.g., "gender", "familyReligion")
 * @param value - The current value (e.g., "man", "hindu")
 * @returns Display label string, or undefined if no value
 */
export declare function labelFor(fieldKey: string, value: unknown): string | undefined;
/**
 * Resolve a multi-select field's current values to display labels.
 *
 * @param fieldKey - The field key
 * @param values - Array of selected values
 * @returns Array of display labels, or undefined if empty
 */
export declare function labelsFor(fieldKey: string, values: unknown): string[] | undefined;
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