export type PtyTerminalOperation = {
    type: "data";
    data: string;
} | {
    type: "resize";
    cols: number;
    rows: number;
};
export interface PtyTerminalSnapshot {
    version: 1;
    data: string;
    cols: number;
    rows: number;
    pending: PtyTerminalOperation[];
}
/**
 * Server-side xterm screen model used only for reconnect snapshots. Live PTY
 * bytes still travel unchanged from node-pty to the browser terminal.
 */
export declare class PtyTerminalState {
    private readonly terminal;
    private readonly serializer;
    private readonly unicode;
    private pending;
    private tail;
    private checkpointTimer?;
    private nextId;
    private committedData;
    private committedCols;
    private committedRows;
    private disposed;
    constructor(cols: number, rows: number, initialData?: string);
    write(data: string): void;
    resize(cols: number, rows: number): void;
    snapshot(): PtyTerminalSnapshot;
    dispose(): void;
    private addPending;
    private scheduleCheckpoint;
}