export interface HerdrWebTerminalSize {
    cols: number;
    rows: number;
}
export interface HerdrWebTerminalBackend {
    acquireWebTerminal(viewer: object): HerdrWebTerminalSize | null;
    resizeWebTerminal(viewer: object, cols: number, rows: number): HerdrWebTerminalSize | null;
    releaseWebTerminal(viewer: object): object | null;
    isWebTerminalOwner(viewer: object): boolean;
}
export interface HerdrWebTerminalBindingState {
    backend: HerdrWebTerminalBackend | null;
    initialSize: HerdrWebTerminalSize | null;
}
export interface HerdrWebTerminalResizeResult extends HerdrWebTerminalBindingState {
    size: HerdrWebTerminalSize | null;
}
/**
 * Keeps one WebSocket viewer attached to the current managed Herdr backend.
 * A worker-level /restart replaces the backend without closing WebSockets, so
 * every message must re-sync this binding before it handles resize ownership.
 */
export declare class HerdrWebTerminalBinding {
    private readonly viewer;
    private readonly resolveBackend;
    private attachedBackend;
    private lastSize;
    constructor(viewer: object, resolveBackend: () => HerdrWebTerminalBackend | null);
    sync(): HerdrWebTerminalBindingState;
    resize(cols: number, rows: number): HerdrWebTerminalResizeResult;
    /**
     * Re-attaches an already-connected viewer after an in-worker backend
     * replacement and re-applies the most recent browser grid. Unlike resize(),
     * this path needs no new browser event: /restart keeps the WebSocket alive.
     */
    restore(): HerdrWebTerminalResizeResult;
    release(): object | null;
}
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