/**
 * A generic Time-To-Live (TTL) cache.
 *
 * Each entry is stored alongside an absolute expiry timestamp. On `get`, if the
 * entry has expired it is lazily removed and `undefined` is returned.
 *
 * Designed for auth token caching where entries should auto-expire (e.g. 1 hour).
 */
export declare class TTLCache<T> {
    private readonly ttlMs;
    private readonly cache;
    constructor(ttlMs: number);
    /** Retrieve a value by key. Returns `undefined` if missing or expired. */
    get(key: string): T | undefined;
    /** Store a value with a TTL starting from now. */
    set(key: string, value: T): void;
    /** Remove an entry. Returns `true` if the key existed. */
    delete(key: string): boolean;
    /** Remove all entries. */
    clear(): void;
}
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