export type DataCallback = (data: string) => void;
export type ExitCallback = (code: number, signal: number) => void;
export declare class PtySession {
    private proc;
    private dataListeners;
    private exitListeners;
    private alive;
    constructor(sessionName: string, cols: number, rows: number);
    onData(cb: DataCallback): void;
    onExit(cb: ExitCallback): void;
    write(data: string): void;
    resize(cols: number, rows: number): void;
    /** Pause PTY output (backpressure from WebSocket) */
    pause(): void;
    /** Resume PTY output after backpressure relief */
    resume(): void;
    kill(): void;
    isAlive(): boolean;
}