import type { TagKind } from "./types.js";
/**
 * Classify a container image tag as semver, floating, or unknown.
 * The service uses this to decide whether to compare versions
 * (semver) or compare digests (floating/unknown).
 *
 * - "9.2.0", "v1.5", "2.0.0-beta1" → semver
 * - "latest", "main", "master", "edge", "nightly", "v3" → floating
 * - "my-fork", "custom-build", "" → unknown (treated like floating
 *   for safety: digest drift only, never claims "newer-version")
 */
export declare function classifyTag(tag: string): TagKind;
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