import type { ResolvedObservability } from '../../core/config/load.js';
/** postgres.js's `debug` hook signature. */
type DebugFn = (connection: number, query: string, parameters: unknown[]) => void;
/**
 * True when the driver's `debug` hook exists ONLY to feed a statement observer.
 * Such a connection's errors are put back to their unobserved shape by the
 * driver error boundary; `logAllQueries` connections are left exactly as they
 * are today, that mode having already opted into verbose errors.
 */
export declare function isObserverOnly(config: ResolvedObservability): boolean;
/**
 * The driver's `debug` hook for a connection, or undefined when nothing is
 * observing. Query logging and the caller-supplied `onStatement` observer are
 * independent: either alone installs the hook, and with both configured both
 * fire for every statement.
 */
export declare function createDebugFn(config: ResolvedObservability): DebugFn | undefined;
export declare function isDeadlock(err: unknown): boolean;
export declare function logDeadlock(err: unknown, dbName: string): void;
export {};
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