export declare type SyncFieldOptions = {
    onPropertyChanged: Function;
};
export declare type FieldChangedCallbackFn = (newValue: any, previousValue: any) => void | boolean | any;
/**
 * Marks a field for automatic network synchronization across connected clients.
 * When a synced field changes, the new value is automatically broadcast to all users in the room.
 *
 * Primitives (string, number, boolean) sync automatically.
 * For arrays/objects, reassign to trigger sync: `this.myArray = this.myArray`
 *
 * @param onFieldChanged Optional callback when the field changes (locally or from network).
 * Return `false` to prevent syncing this change to others.
 *
 * @example Basic sync
 * ```ts
 * class MyComponent extends Behaviour {
 *   @syncField() playerScore: number = 0;
 * }
 * ```
 * @example With change callback
 * ```ts
 * class MyComponent extends Behaviour {
 *   @syncField("onHealthChanged") health: number = 100;
 *
 *   onHealthChanged(newValue: number, oldValue: number) {
 *     console.log(`Health: ${oldValue} → ${newValue}`);
 *   }
 * }
 * ```
 * @example Preventing sync (one-way)
 * ```ts
 * class MyComponent extends Behaviour {
 *   @syncField(function(newVal, oldVal) {
 *     // Process incoming value but don't sync our changes
 *     return false;
 *   }) serverControlled: string = "";
 * }
 * ```
 * @see {@link serializable} for editor serialization
 * @link https://engine.needle.tools/docs/how-to-guides/networking/
 */
export declare const syncField: (onFieldChanged?: string | FieldChangedCallbackFn | undefined | null) => (target: any, _propertyKey: string | {
    name: string;
}) => void;
export declare type SyncOptions = {
    key?: string;
    fieldName?: string;
};
/** experimental - use syncField instead */
export declare const sync: (_options?: SyncOptions) => <T>(target: any, _propertyKey: string, descriptor: PropertyDescriptor) => void;