export declare const GROUND_ITEM_KINDS: readonly string[];
/**
 * Item kinds that should never show a "Drop" action, e.g. because dropping them would
 * softlock progression. Empty by default - every known item is droppable unless a kind
 * is explicitly listed here for a specific, documented reason.
 */
export declare const UNDROPPABLE_ITEM_KINDS: readonly string[];
export declare function isGroundItemKind(kind: string): boolean;
export declare function isUndroppableItemKind(kind: string): boolean;
/**
 * Since 2026-09-19 every item can be dropped: kinds outside GROUND_ITEM_KINDS
 * lie on the floor as a generic 'loot' entity styled by the item, so this is
 * only the undroppable veto. Callers still guard on the item being known.
 */
export declare function isDroppableItemKind(kind: string): boolean;
export declare const DROPPED_ITEM_LIFETIME_MS = 30000;
/** Death loot stays on the tile this long; any player may pick it up. */
export declare const DEATH_DROP_LIFETIME_MS = 60000;
/** Default late-life fade for timed ground items that do not set `fadeMs`. */
export declare const GROUND_ITEM_FADE_MS = 10000;
export declare function groundItemFadeAlpha(remainingMs: number, fadeMs?: number): number;
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