import { Logger } from '../../util/logging.js';
/**
 * Receives one OAuth authorization code on a loopback HTTP server.
 *
 * The server binds to `127.0.0.1` on an available port. It accepts the code
 * only when the returned state matches the generated state. This class is a
 * low-level part of interactive federation login.
 */
export declare class CallbackHandler {
    private _code;
    private _state;
    private _server;
    private _addr;
    private _codePromise;
    private _codePromiseResolve;
    private _codePromiseReject;
    private readonly logger?;
    /** Creates a new callback handler. */
    constructor(logger?: Logger);
    /** Returns the OAuth state value. */
    get state(): string;
    /** Returns the received authorization code. */
    get code(): string | null;
    /** Returns the redirect URI after the server starts; throws before then. */
    get addr(): string;
    /** Starts the local callback server. Call {@link waitForCode} to await the request. */
    listenAndServe(): Promise<void>;
    private _setCode;
    /** Stops the local callback server. */
    shutdown(): Promise<void>;
    /** Waits for a valid code and rejects when the optional timeout expires. */
    waitForCode(timeoutMs: number | undefined): Promise<string | null>;
}
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