import type { EventEmitter } from "node:events";
export declare function getSettingsEmitter(): EventEmitter;
export declare function getSetting(key: string): Promise<Record<string, unknown> | null>;
export interface StoreWriteOptions {
    /** Tag identifying who initiated this write (e.g. a tab ID). */
    requestSource?: string;
}
/**
 * Atomically derive and persist one setting with an optimistic raw-value CAS.
 * This works across SQLite/libSQL and Postgres and remains safe across
 * horizontally scaled processes where an in-memory mutex would not.
 * The updater may run more than once after contention and must not perform
 * external side effects.
 */
export declare function mutateSetting(key: string, updater: (current: Record<string, unknown> | null) => Record<string, unknown> | Promise<Record<string, unknown>>, options?: StoreWriteOptions): Promise<Record<string, unknown>>;
export declare function putSetting(key: string, value: Record<string, unknown>, options?: StoreWriteOptions): Promise<void>;
export declare function deleteSetting(key: string, options?: StoreWriteOptions): Promise<boolean>;
/**
 * Delete every setting whose key starts with `prefix`. Returns the number of
 * rows removed. Used when an owning entity is deleted (e.g. an organization
 * takes its `o:<orgId>:*` keys with it).
 */
export declare function deleteSettingsByPrefix(prefix: string, options?: StoreWriteOptions): Promise<number>;
export declare function getAllSettings(): Promise<Record<string, Record<string, unknown>>>;
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