import type { LanguageModelV4Middleware, LanguageModelV4Usage } from "@ai-sdk/provider";
/** Minimal logger surface (a subset of `BasicLogger`). */
interface RetryLogger {
    log?(message: string, meta?: Record<string, unknown>): void;
}
export interface RetryEmptyResponseOptions {
    /** Total attempts including the first (so `3` means up to 2 retries). */
    maxAttempts?: number;
    /** Delay before each empty-response retry, in milliseconds. */
    retryDelayMs?: number;
    /**
     * Delay before the first network-interruption retry, in milliseconds;
     * doubles for each subsequent one (2s → 4s with the defaults, matching
     * the legacy extension's backoff).
     */
    networkRetryDelayMs?: number;
    logger?: RetryLogger;
}
/** Default total attempts (first try + 2 retries). */
export declare const DEFAULT_EMPTY_RESPONSE_MAX_ATTEMPTS = 3;
/** Default delay before a retry. */
export declare const DEFAULT_EMPTY_RESPONSE_RETRY_DELAY_MS = 250;
/** Default delay before the first network-interruption retry. */
export declare const DEFAULT_NETWORK_RETRY_DELAY_MS = 2000;
/**
 * Whether an error (anywhere in its `cause` chain) identifies a transient
 * transport interruption — the connection died or timed out underneath a
 * request the provider never rejected. An abort anywhere in the chain
 * vetoes the match: cancelled requests surface the same socket vocabulary,
 * and a user cancel must never be retried. Everything else — HTTP business
 * errors, context-window errors, provider-reported payloads — does not
 * match.
 */
export declare function isTransientNetworkError(error: unknown): boolean;
/** Sum two standardized v4 usage records field by field. */
export declare function addUsage(a: LanguageModelV4Usage, b: LanguageModelV4Usage): LanguageModelV4Usage;
/**
 * Create a middleware that retries empty model responses. Apply it as the
 * outermost middleware (first in the `wrapLanguageModel` array) so each retry
 * re-runs the full request.
 */
export declare function createRetryEmptyResponseMiddleware(options?: RetryEmptyResponseOptions): LanguageModelV4Middleware;
export {};
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