/**
 * True for connection-level failures that are safe to retry on a fresh socket:
 * the known transient `code`/`errno` values, plus node-fetch's "Premature
 * close" / "socket hang up" (which arrive as a wrapped FetchError whose message
 * — not always its `code` — carries the cause).
 */
export declare function isTransientNetworkError(err: unknown): boolean;
export interface RetryOptions {
    /** Number of retries AFTER the first attempt. Default 2 (so up to 3 tries). */
    retries?: number;
    /** Base backoff in ms; the i-th retry waits up to `baseDelayMs * 2^i`. Default 50. */
    baseDelayMs?: number;
    /** Upper bound on a single backoff delay, in ms. Default 250. */
    maxDelayMs?: number;
    /** Predicate deciding whether an error is retryable. Default: transient network errors. */
    shouldRetry?: (err: unknown) => boolean;
}
/**
 * Run `fn`, retrying on retryable errors with full-jitter exponential backoff.
 * Full jitter (delay drawn from `[0, cap]`) avoids synchronised retry bursts
 * when many calls fail at once. Non-retryable errors propagate immediately.
 */
export declare function retryTransient<T>(fn: () => Promise<T>, options?: RetryOptions): Promise<T>;