import type { CacheStats, TokenCache, TokenCacheEntry } from "./types.js";
export type TokenCacheOperations = Readonly<{
    [Key in keyof TokenCache]: TokenCache[Key];
}>;
export declare function assertCacheOptionsObject(value: unknown, label: string, allowedKeys: readonly string[]): asserts value is Record<string, unknown>;
/**
 * Enforce synchronous registry mutation across cache startup seams. TypeScript
 * permits async functions where a void-returning callback is expected, so the
 * runtime must reject and observe returned thenables explicitly.
 */
export declare function requireSynchronousCacheRegistryOperation(result: unknown, label: string): void;
export declare function snapshotTokenCacheOperations(value: unknown, label?: string): TokenCacheOperations;
/**
 * Capture cleanup ownership before validating the rest of an extension
 * contract. The bound data-function snapshot cannot be replaced by a later
 * property mutation or accessor.
 */
export declare function snapshotTokenCacheClose(value: unknown, label?: string): TokenCache["close"];
/**
 * Snapshot a cache and place its owned close operation behind one immutable
 * attempt. Independent aggregate and direct owners can then share teardown
 * without assuming the backend's raw close operation is idempotent.
 */
export declare function snapshotOwnedTokenCacheOperations(value: unknown, label?: string): TokenCacheOperations;
export declare function requireTokenCacheKey(value: unknown): string;
export declare function snapshotTokenCacheEntry(value: unknown): TokenCacheEntry;
export declare function snapshotTokenCacheStats(value: unknown): CacheStats;
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