import type { TopicManager } from './lifecycle.js';
/**
 * A dependency on the Topic lifecycle gate during the `threadManager` rename
 * window.
 *
 * At least one spelling is required. Supplying both is accepted only when
 * they name the same manager instance; choosing one of two different gates by
 * property order would make archive enforcement depend on object shape.
 */
export type TopicManagerDependency = {
    readonly topicManager: TopicManager;
    /** @deprecated Use {@link topicManager}. */
    readonly threadManager?: TopicManager;
} | {
    readonly topicManager?: never;
    /** @deprecated Use `topicManager`. */
    readonly threadManager: TopicManager;
};
/** Resolve the canonical manager or refuse an ambiguous/missing runtime input. */
export declare function resolveTopicManager(dependency: {
    readonly topicManager?: TopicManager;
    readonly threadManager?: TopicManager;
}): TopicManager;
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