/**
 * Resolve icon URL variants with fallback logic.
 *
 * Returns `null` when **all three** variants are missing (undefined/null/empty),
 * which signals a validation error. When at least one variant is available the
 * missing ones are filled in using a priority chain:
 *
 * - `low`  : try medium, then high
 * - `medium`: try low, then high
 * - `high` : try medium, then low
 */
export declare function resolveIconUrls(low: string | undefined | null, medium: string | undefined | null, high: string | undefined | null): {
    low: string;
    medium: string;
    high: string;
} | null;
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