import type { DB } from './types.js';
/** Retry policy for {@link serializable}: how many attempts on a serialization failure / deadlock, and the base backoff between them. */
export interface SerializableOptions {
    readonly maxAttempts?: number;
    readonly backoffMs?: number;
}
/** The Postgres SQLSTATE carried by an error (or by its cause), or undefined for a non-Postgres error. */
export declare function pgErrorCode(err: unknown): unknown;
/** True for Postgres serialization failures (40001) and deadlocks (40P01) — errors a retry can resolve. */
export declare function isTransientConcurrencyError(err: unknown): boolean;
/** Runs `fn` in a SERIALIZABLE transaction, retrying on serialization failures (40001) and deadlocks (40P01) with exponential backoff. */
export declare function serializable<T>(db: DB, fn: (tx: DB) => Promise<T>, options?: SerializableOptions): Promise<T>;
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