/**
 * In-process memory cache with TTL.
 *
 * Used by DataStore to avoid re-reading JSON from disk on every call.
 * Entry is invalidated on write and expires after `ttlMs`.
 */
export declare class MemoryCache {
    private readonly ttlMs;
    private store;
    constructor(ttlMs?: number);
    get<T>(key: string): T | undefined;
    set<T>(key: string, value: T, ttlMs?: number): void;
    invalidate(key: string): void;
    /** Drop all entries whose key starts with prefix (e.g. "token:<ca>:") */
    invalidatePrefix(prefix: string): void;
    clear(): void;
    /** Test helper: number of live (not yet expired) entries */
    size(): number;
}
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