/**
 * Build the variant_id string for a bucket assignment.
 *
 * @param isControl - Whether this is the control bucket
 * @param variantLabel - CMS variant_label for the bucket
 * @param fallbackSlug - Fallback label when variant_label is absent
 */
export declare function buildVariantId(isControl: boolean, variantLabel: string | undefined, fallbackSlug: string): string;
//# sourceMappingURL=variantId.d.ts.map