/**
 * Minimal reactive proxy helper for engine ECS internals.
 *
 * Note: This is intentionally lightweight and only provides the `reactive`
 * API shape consumed by `ecs/World.ts`.
 */
export declare function reactive<T extends object>(target: T, onMutation?: (target: T, key: string | symbol, value: unknown, oldValue: unknown) => void): T;
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