/**
 * Compare two dotted version strings segment-by-segment (so `15.10` sorts
 * above `15.4`, unlike a naive parseFloat). Missing segments are treated as 0.
 * Returns <0 if a<b, 0 if equal, >0 if a>b, or NaN if either is unparseable.
 */
export declare function compareVersions(a: string, b: string): number;
/**
 * True when `target` is older than the minimum supported `min` version.
 * Unparseable inputs are treated as "not below" (no false positive).
 */
export declare function isBelowMinVersion(min: string, target: string): boolean;