import { RpgPlayerSnapshot } from './types';
/** Copy signal fields to their public name when the public field is missing. */
export declare function addPublicSnapshotAliases(snapshot: unknown): void;
/** Copy public fields back to their signal field when the signal field is missing. */
export declare function addSignalSnapshotAliases(snapshot: unknown): void;
/** Read a saved hitbox (`{ w, h }` or `{ width, height }`), or `null` when invalid. */
export declare function normalizeSnapshotHitbox(hitbox: unknown): {
    w: number;
    h: number;
} | null;
/** Whether a `load()` argument is a snapshot (object or JSON string) rather than a slot. */
export declare function isSnapshotInput(input: unknown): input is string | RpgPlayerSnapshot;