import type { PlayerPublic } from './messages.js';
/**
 * Roster deltas (B-113, W-330). The server used to send every player the whole roster, full appearance and all, each time
 * anyone changed, so bytes out grew with the square of the players in one place. A client that joins with
 * `rosterDelta: true` instead gets, per viewer:
 *  - `add`: a full PlayerPublic the first time a player is in view range (appearance included, once);
 *  - `patch`: only the fields that changed since that viewer was last told;
 *  - `remove`: a player who left the view range (or the game).
 * The helpers below are shared by the server (diff) and the client (apply) so both agree on what a patch means.
 */
/** A player closer than this many tiles (Euclidean) is in a viewer's roster. */
export declare const ROSTER_VIEW_RADIUS = 96;
/** A player already in the roster stays until further than this (hysteresis, so a border walker does not flicker). */
export declare const ROSTER_LEAVE_RADIUS = 112;
/** Changed fields of one player: `set` carries new values, `unset` names optional fields that are now absent. */
export type PlayerPatch = {
    id: string;
    set?: Partial<PlayerPublic>;
    unset?: string[];
};
/** What changed from `prev` to `next` (same id), or null when nothing did. */
export declare function diffPlayerPublic(prev: PlayerPublic, next: PlayerPublic): PlayerPatch | null;
/** The player after the patch; `prev` is not changed. */
export declare function applyPlayerPatch(prev: PlayerPublic, patch: PlayerPatch): PlayerPublic;
/**
 * Client side: fold a `players_delta` into the roster the client holds. Returns the players to redraw and whether a patch
 * named someone the client was never given (a lost message): the client then sends `roster_resync`.
 */
export declare function applyRosterDelta(known: Map<string, PlayerPublic>, delta: {
    add?: PlayerPublic[];
    patch?: PlayerPatch[];
    remove?: string[];
}): {
    changed: PlayerPublic[];
    removed: string[];
    needResync: boolean;
};
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