/**
 * StartupSequencer — Manages ordered output during Beam startup.
 *
 * Replaces the ad-hoc output buffering (outputQueue, suppressOutput,
 * console monkey-patching) in startBeam() with a clean state machine.
 *
 * States: buffering → url_shown → ready
 *
 * During 'buffering', all console output is queued.
 * At 'url_shown' (TTY only), a status line is shown on stderr.
 * At 'ready', queued output is flushed and console is restored.
 */
export declare class StartupSequencer {
    private state;
    private queue;
    private url;
    private originalLog;
    private originalWarn;
    private originalError;
    private originalStderrWrite;
    private isTTY;
    private version;
    private workingDir;
    constructor(version: string, workingDir: string);
    /** Replace console methods to queue output during startup. */
    private intercept;
    /** Show the URL status line (called when server starts listening). */
    showUrl(url: string): void;
    /**
     * Mark startup as complete — flush queued output and restore console.
     * Call this after all photons are loaded.
     */
    ready(): void;
    /** Restore original console methods. */
    private restore;
    /** Flush all queued messages to stderr. */
    private flush;
    /** Format the status line. */
    private formatStatus;
}
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