import type { VercelInteractiveSandbox } from './terminal.js';
export interface VercelTerminalTimeoutScheduler {
    setTimeout(callback: () => void, delay: number): unknown;
    clearTimeout(handle: unknown): void;
}
export interface VercelTerminalTimeoutOptions {
    intervalMs?: number;
    extensionMs?: number;
    bufferMs?: number;
    scheduler?: VercelTerminalTimeoutScheduler;
}
export declare function startTimeoutExtension(sandbox: VercelInteractiveSandbox, options: VercelTerminalTimeoutOptions, signal: AbortSignal, onError: (error: unknown) => void): () => void;