/**
 * Energy: a 0-100 bar that running spends and rest gives back (James, 2026-10-08).
 * Session-only (not saved): everyone joins full. The server owns it and sends the
 * bar to its owner only; the client shows it only while it is changing.
 */
export declare const ENERGY_MAX = 100;
/** Spent per second of running. About 67 s of running from full (James, 2026-10-09: run energy must deplete faster). */
export declare const ENERGY_RUN_DRAIN_PER_SEC = 1.5;
/** Regained per second walking, standing still and sitting. */
export declare const ENERGY_WALK_REGEN_PER_SEC = 0.25;
export declare const ENERGY_STILL_REGEN_PER_SEC = 0.5;
export declare const ENERGY_SIT_REGEN_PER_SEC = 5;
/** Running will not start below this, so a toggle cannot flicker at empty. */
export declare const ENERGY_MIN_TO_RUN = 5;
/** Sitting out of a fight heals this many times faster than standing. */
export declare const SIT_HEAL_MULTIPLIER = 3;
export type EnergyActivity = 'running' | 'walking' | 'still' | 'sitting';
/** Rate in energy per second (negative while running). */
export declare function energyRate(activity: EnergyActivity): number;
/** Energy after `seconds` of `activity`, clamped to 0..ENERGY_MAX. */
export declare function stepEnergy(energy: number, seconds: number, activity: EnergyActivity): number;
/** True while the bar is worth showing: it is below full, or the player is running. */
export declare function energyBarVisible(energy: number, running: boolean): boolean;
/** Why a player may not sit right now, or null when they may. */
export declare function sitRefusal(state: {
    moving: boolean;
    inCombat: boolean;
    busy: boolean;
    dead: boolean;
}): string | null;
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