/**
 * The key/value store one plugin sees. Every method is already bound to the
 * plugin it was made for, so no call takes an id: a plugin cannot name another
 * plugin's namespace because there is nowhere in this interface to put one.
 */
export interface PluginStorage {
    /** The stored value, or undefined when this plugin has never written that key. */
    get(key: string): unknown;
    set(key: string, value: unknown): void;
    delete(key: string): void;
    /** This plugin's keys, in insertion-independent alphabetical order. */
    keys(): string[];
}
/** The store for one plugin id, with the id closed over rather than passed in. */
export declare function pluginStorage(id: string): PluginStorage;
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