import { type AuthMetricsInput, type AuthMetricsRecorder } from '../../metrics.js';
import { Bearer, Receiver } from '../../token.js';
import { custom, customJson, Logger } from '../../util/logging.js';
/**
 * Reads a named token from a shared file cache and refreshes it through another
 * bearer when required.
 *
 * The first fetch prefers a valid cache entry. After an authentication error,
 * the receiver checks the file again, then asks the wrapped bearer for a fresh
 * token and writes it back. The wrapped bearer must have a stable name.
 */
export declare class RenewableFileCacheBearer extends Bearer {
    [custom]: () => string;
    private logger?;
    /** Contains the fully qualified runtime type name. */
    readonly $type = "nebius.sdk.RenewableFileCacheBearer";
    private readonly _cache;
    private _wrapped;
    /** Contains the metrics. */
    readonly metrics: AuthMetricsRecorder;
    /** Minimum remaining lifetime required to accept the first cached token, in milliseconds. */
    safetyMargin: number | null;
    /**
     * Creates a file-backed cache layer.
     *
     * `throttleMs` limits how often this process checks the shared file.
     * `safetyMarginMs` rejects a token that is too close to expiration.
     */
    constructor(_wrapped: Bearer, safetyMarginMs?: number, cacheFile?: string, throttleMs?: number, logger?: Logger | undefined, metrics?: AuthMetricsInput, provider?: string);
    /** Returns a JSON-safe value for logs. */
    [customJson](): unknown;
    /** Returns the wrapped bearer. */
    get wrapped(): Bearer | undefined;
    /** Creates a token receiver. */
    receiver(): Receiver;
    /** Sets the metrics. */
    setMetrics(metrics: AuthMetricsInput): void;
}
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