import { HealthCheckResult } from "./HealthCheckResult.js";
import { QueryResult } from './QueryResult.js';
import { DatabaseTransaction } from './DatabaseTransaction.js';
export interface DatabaseClient {
    initialize(): Promise<void>;
    close(): Promise<void>;
    query<T>(sql: string, params?: any[]): Promise<QueryResult<T>>;
    transaction<T>(callback: (tx: DatabaseTransaction) => Promise<T>): Promise<T>;
    getDatabaseType(): 'postgresql' | 'mysql';
    supportsReturning(): boolean;
    healthCheck(): Promise<HealthCheckResult>;
    getConnectionInfo?(): {
        total: number;
        idle: number;
        waiting: number;
    };
}
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