/**
 * Retry utility with exponential backoff
 * Used by database adapters for transient connection errors.
 */
export interface RetryOptions {
    /** Maximum number of retries (default: 1) */
    retries?: number;
    /** Base delay in ms; delay = baseDelayMs * 2^attempt (default: 50) */
    baseDelayMs?: number;
    /** Custom error classifier; default uses isConnectionErrorMessage */
    isRetryable?: (error: unknown) => boolean;
}
/**
 * Check if an error message indicates a transient connection problem.
 * Covers common patterns across MySQL, PostgreSQL, and generic socket errors.
 */
export declare function isConnectionErrorMessage(msg: string): boolean;
/**
 * Execute fn with retry on transient connection errors.
 * Throws if all retries are exhausted.
 */
export declare function withRetry<T>(fn: () => Promise<T>, options?: RetryOptions): Promise<T>;
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