import { type AuthMetricsInput } from '../metrics.js';
import { Bearer, Receiver, Token } from '../token.js';
import { custom, customJson } from '../util/logging.js';
/**
 * Reads a fixed access token from a text file for every authentication fetch.
 *
 * The file must contain one non-empty line. Leading and trailing whitespace is
 * removed. This bearer does not renew the token, but it sees file changes on
 * later requests.
 *
 * @example
 * ```ts
 * import { SDK } from '@nebius/js-sdk';
 * import { FileBearer } from '@nebius/js-sdk/runtime/token/file';
 *
 * const sdk = new SDK({
 *   credentials: new FileBearer('~/.config/my-app/token'),
 *   userAgentPrefix: 'example-application/1.0',
 * });
 * ```
 */
export declare class FileBearer extends Bearer {
    [custom]: () => string;
    /** Contains the fully qualified runtime type name. */
    readonly $type = "nebius.sdk.FileBearer";
    private readonly filePath;
    private readonly metrics;
    /** Creates a bearer for `filePath`. A leading `~` resolves to the home directory. */
    constructor(filePath: string, metrics?: AuthMetricsInput);
    /** Returns a JSON-safe value for logs. */
    [customJson](): unknown;
    /** Creates a token receiver. */
    receiver(): Receiver;
    /**
     * Reads and validates the current file contents.
     *
     * Rejects when the file is empty, contains an embedded newline, or cannot be
     * read. The returned token has no known expiration.
     */
    fetchToken(): Promise<Token>;
    /** Sets the metrics. */
    setMetrics(metrics: AuthMetricsInput): void;
}
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