import type { ArkmeEnvironment, ArkmeSourceItem } from '../types.js';
type PreferenceStorage = Pick<Storage, 'getItem' | 'setItem'>;
type ExpansionUpdate = (current: ReadonlySet<string>) => ReadonlySet<string>;
export declare function selfTopicExpansionKey(userId: number | undefined, environment: ArkmeEnvironment): string | undefined;
export declare function selfTopicExpansionIdentity(source: ArkmeSourceItem): string;
/** Synchronous writes survive menu unmounts. All entry points share one account store. */
export declare class SelfTopicExpansionStore {
    private readonly key?;
    private readonly storage;
    private value;
    private readonly listeners;
    constructor(key?: string | undefined, storage?: PreferenceStorage | undefined);
    private read;
    readonly getSnapshot: () => ReadonlySet<string>;
    readonly getServerSnapshot: () => ReadonlySet<string>;
    readonly subscribe: (listener: () => void) => (() => void);
    update(update: ExpansionUpdate): void;
}
export declare function sourceRefsFromExpansionKeys(keys: ReadonlySet<string>, sources: readonly ArkmeSourceItem[]): Set<string>;
export declare function updateExpansionKeys(keys: ReadonlySet<string>, sources: readonly ArkmeSourceItem[], update: ExpansionUpdate): ReadonlySet<string>;
export declare function useSelfTopicExpansion(userId: number | undefined, environment: ArkmeEnvironment, sources: readonly ArkmeSourceItem[]): readonly [Set<string>, (change: ExpansionUpdate, currentSources?: readonly ArkmeSourceItem[]) => void];
export {};
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