import type { Config, ConfigStore } from '../types/config.js';
/**
 * Reference implementation of `ConfigStore`. Stores a single frozen Config
 * and notifies watchers synchronously on every update. Updates use a deep
 * clone so callers can mutate their `partial` argument freely without
 * tainting state.
 *
 * For the CLI: instantiate once at boot, pass the store (not the Config)
 * to subsystems that care about runtime changes (provider switching,
 * extension reload).
 */
export declare class DefaultConfigStore implements ConfigStore {
    private current;
    private watchers;
    constructor(initial: Config);
    get(): Readonly<Config>;
    getSection<K extends keyof Config>(key: K): Readonly<Config[K]>;
    getExtension(pluginName: string): Readonly<Record<string, unknown>>;
    update(partial: Partial<Config>): Readonly<Config>;
    watch(cb: (next: Readonly<Config>, prev: Readonly<Config>) => void): () => void;
}
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