type Listener = () => void;
/**
 * Ephemeral per-plugin state, keyed by plugin and then by the plugin's own key.
 *
 * A plugin's surfaces render in unrelated React subtrees — a map tool, a viewer sidebar tab,
 * a dialog and a data page have no common ancestor below the host — so they cannot share
 * state through context or props. `usePluginStore` is the persisted alternative and costs a
 * server round trip per write, which is wrong for a selection.
 *
 * Module scope rather than a provider, for the same reason: a provider would have to sit
 * above every surface, and the surfaces do not share one.
 */
declare class PluginStateStore {
    private values;
    private listeners;
    private static scopedKey;
    get<T>(pluginId: string, key: string, initial: T): T;
    set<T>(pluginId: string, key: string, value: T): void;
    subscribe(pluginId: string, key: string, listener: Listener): () => void;
    /**
     * Drops everything one plugin holds. Called when it is disabled or unloaded, so a plugin
     * re-enabled in the same session starts clean rather than resuming a stale selection.
     */
    clear(pluginId: string): void;
}
export declare const pluginStateStore: PluginStateStore;
export {};
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