/**
 * Interval conversion utilities shared between graphql-naming.ts and tests.
 *
 * NOTE: @pgpmjs/csv-to-pg has its own formatInterval() in parse.ts which
 * performs the same object→string conversion. That is a separate package with
 * its own release cycle, so we do not cross-reference it here. If interval
 * handling needs to be unified across packages, that would require an
 * architectural change (shared dependency or monorepo util package).
 */
/** Shape of a PostGraphile Interval object (OBJECT type in introspection). */
export interface PgInterval {
    years: number | null;
    months: number | null;
    days: number | null;
    hours: number | null;
    minutes: number | null;
    seconds: number | null;
}
/**
 * Convert a PostgreSQL interval object (from GraphQL Interval type) back to a
 * Postgres interval string.
 * e.g. { years: 0, months: 0, days: 0, hours: 1, minutes: 30, seconds: 0 } → '1:30:00'
 */
export declare const intervalToPostgres: (interval: Record<string, number | null> | null) => string | null;
/**
 * Parse a PostgreSQL interval string into the object shape that PostGraphile's
 * Interval type returns: { years, months, days, hours, minutes, seconds }.
 *
 * Handles formats like:
 *   '30 days' → { years: 0, months: 0, days: 30, hours: 0, minutes: 0, seconds: 0 }
 *   '1:30:00'  → { years: 0, months: 0, days: 0, hours: 1, minutes: 30, seconds: 0 }
 */
export declare const parsePgInterval: (value: string) => Record<string, number>;