/** Provider-neutral runtime support for atomic cache revisions. */
import type { CacheBackend, CacheRevisionSnapshot, RevisionedCacheBackend } from "./types.js";
/** Reserved logical-key namespace for revisioned Veryfront cache entries. */
export declare const REVISIONED_CACHE_KEY_PREFIX = "vf:revisioned:v1:";
/** Maximum source-key length before the reserved namespace is added. */
export declare const MAX_REVISIONED_CACHE_SOURCE_KEY_LENGTH: number;
type CapturedRevisionMethods = Readonly<{
    getWithRevision: RevisionedCacheBackend["getWithRevision"];
    compareExchange: RevisionedCacheBackend["compareExchange"];
}>;
/**
 * Capture the complete optional method group without invoking accessors or
 * reading properties. This helper is internal to core and intentionally is
 * not re-exported from cache barrels.
 *
 * @internal
 */
export declare function captureRevisionedCacheBackendMethods(backend: unknown): CapturedRevisionMethods | null;
/** Test whether a backend exposes the complete atomic revision capability. */
export declare function isRevisionedCacheBackend(backend: CacheBackend): backend is RevisionedCacheBackend;
/** Validate and detach a provider-returned revision snapshot. */
export declare function snapshotCacheRevisionResult(value: unknown): CacheRevisionSnapshot;
/** Validate a provider-returned compare-exchange result. */
export declare function requireCacheExchangeResult(value: unknown): boolean;
/** Add the reserved versioned namespace to one valid source key. */
export declare function buildRevisionedCacheKey(key: string): string;
/** Test whether a key belongs to the valid revisioned-key builder image. */
export declare function isRevisionedCacheKey(key: unknown): key is string;
export {};
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