/**
 * 2011 Peter 'Pita' Martischka
 * 2020 John McLear
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { Database as DatabaseCache, type Metrics } from "./lib/CacheAndBufferLayer";
import { normalizeLogger } from "./lib/logging";
import type { Settings } from "./lib/AbstractDatabase";
export type { Settings } from "./lib/AbstractDatabase";
export type { Metrics, CacheSettings } from "./lib/CacheAndBufferLayer";
export type { Logger } from "./lib/logging";
export type DatabaseType = "cassandra" | "couch" | "dirty" | "dirtygit" | "elasticsearch" | "memory" | "mock" | "mongodb" | "mssql" | "mysql" | "postgres" | "postgrespool" | "redis" | "rethink" | "rustydb" | "sqlite" | "surrealdb";
export declare class Database {
    readonly type: DatabaseType;
    readonly dbSettings: Settings | null | string;
    readonly wrapperSettings: Record<string, unknown> | null;
    private readonly _logger;
    db: DatabaseCache;
    metrics: Metrics;
    /**
     * @param type The type of the database
     * @param dbSettings The settings for that specific database type
     * @param wrapperSettings Cache/buffer layer settings (cache size, write interval, etc.)
     * @param logger Optional logger (log4js, console, or any object with debug/info/warn/error methods)
     */
    constructor(type: DatabaseType | undefined, dbSettings: Settings | null | string, wrapperSettings?: Record<string, unknown> | null, logger?: Partial<ReturnType<typeof normalizeLogger>> | null);
    init(): Promise<void>;
    private initDB;
    flush(): Promise<void>;
    /** @deprecated Use flush() */
    doShutdown(): Promise<void>;
    get(key: string): Promise<unknown>;
    findKeys(key: string, notKey?: string): Promise<string[]>;
    /**
     * Returns up to `options.limit` keys matching `key` (excluding `notKey`),
     * sorted ascending. Page by passing the last returned key as `options.after`
     * on the next call; the final page returns fewer than `options.limit` keys.
     * Designed for memory-bounded iteration over large keyspaces.
     */
    findKeysPaged(key: string, notKey: string | null | undefined, options: {
        limit: number;
        after?: string;
    }): Promise<string[]>;
    remove(key: string): Promise<void>;
    set(key: string, value: unknown): Promise<void>;
    getSub(key: string, sub: string[]): Promise<unknown>;
    setSub(key: string, sub: string[], value: unknown): Promise<void>;
    close(): Promise<void>;
}
export default Database;
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