/**
 * Acquires tokens from a Nebius-compatible HTTP metadata endpoint.
 *
 * @packageDocumentation
 */
import { type AuthMetricsInput } from '../metrics.js';
import { Bearer, Receiver, Token } from '../token.js';
import { custom, customJson } from '../util/logging.js';
/** Configures token acquisition from a Nebius-compatible HTTP metadata endpoint. */
export interface IMDSOptions {
    /** Sets the HTTP attempt count. The default is three. */
    maxAttempts?: number;
    /** Sets linear retry backoff in milliseconds. The default is 200. */
    baseBackoffMs?: number;
    /** Supplies an HTTP implementation. */
    fetch?: typeof globalThis.fetch;
    /** Receives authorization metrics. */
    metrics?: AuthMetricsInput;
}
/** Reads access_token and expires_at from an HTTP token endpoint for each acquisition. */
export declare class IMDSBearer extends Bearer {
    [custom]: () => string;
    private readonly endpoint;
    readonly $type = "nebius.sdk.IMDSBearer";
    private readonly metrics;
    private readonly fetcher;
    private readonly maxAttempts;
    private readonly backoffMs;
    /**
     * Creates an HTTP metadata token source.
     * Throws if the endpoint is not a valid HTTP(S) URL or the retry options are invalid.
     */
    constructor(endpoint: string, options?: IMDSOptions);
    get metricProvider(): string;
    /** Returns a JSON-safe value for logs. */
    [customJson](): object;
    /** Sets the authorization metrics sink. */
    setMetrics(metrics: AuthMetricsInput): void;
    receiver(): Receiver;
    /** Fetches a token. Retries HTTP 429 and 5xx responses within one timeout budget. */
    fetchToken(timeoutMs?: number): Promise<Token>;
}
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