/**
 * BFS cycle detection for required component graphs.
 * Shared by ECSpresso and Plugin.
 *
 * @param trigger     The component that triggers the requirement
 * @param newRequired The component about to be added as required
 * @param getRequirements Callback returning the existing requirements for a component
 * @throws Error if adding trigger→newRequired would create a cycle
 */
export declare function checkRequiredCycle<K>(trigger: K, newRequired: K, getRequirements: (component: K) => Iterable<{
    component: K;
}> | undefined): void;