import { AppCacheGroupAxis } from "../types";
/**
 * The grouping axes available for the app-caches breakdown. "none" is not an
 * axis - a flat list is simply an empty hierarchy.
 */
export declare const APP_CACHE_GROUP_AXES: AppCacheGroupAxis[];
/**
 * Default grouping hierarchy: safety tier first (risk-forward, the right
 * default for a safety-oriented cleaner), then cache kind, then app.
 */
export declare const DEFAULT_GROUP_HIERARCHY: AppCacheGroupAxis[];
export declare function isGroupAxis(value: string): value is AppCacheGroupAxis;
/**
 * Coerce an arbitrary value (a config array, a CLI comma-list string, a single
 * axis, or "none"/blank) into an ordered, de-duplicated axis hierarchy.
 * Unknown axes are dropped; "none" or blank yields a flat list (`[]`).
 */
export declare function normalizeHierarchy(value: unknown): AppCacheGroupAxis[];
/**
 * Resolve the effective hierarchy from a stored config value. `undefined` falls
 * back to the default; any defined value (including `[]`) is honored after
 * normalization, so a user can explicitly choose a flat list.
 */
export declare function resolveStoredHierarchy(stored: unknown): AppCacheGroupAxis[];
/** Human-readable hierarchy label, e.g. "tier → kind → app" or "flat". */
export declare function formatHierarchy(hierarchy: AppCacheGroupAxis[]): string;
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