/**
 * Reports whether any tmux client is attached to the session this HUD pane
 * belongs to. Used by watch mode to avoid render-only work (state reads, git
 * subprocess spawns, tmux reconciliation, stdout writes) while nobody is
 * looking at the pane. (closes #3577)
 *
 * Returns true (assume attached) whenever the answer is unknown, so the HUD
 * keeps rendering on non-tmux terminals, when tmux is unavailable, or on any
 * query failure — detached suppression only happens on a trusted "0".
 */
export declare function isHudWatchSessionAttached(deps?: {
    env?: NodeJS.ProcessEnv;
    execTmuxSync?: (args: string[]) => string;
}): boolean;
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