import type { AssistantMessage, Context } from "../types.js";
import { AssistantMessageEventStream } from "./event-stream.js";
export declare const MAX_EMPTY_COMPLETION_RETRIES = 2;
export declare const EMPTY_COMPLETION_BASE_DELAY_MS = 500;
/**
 * Whether a completed assistant message carries content worth delivering: an
 * image, tool call, or any non-whitespace text. An empty/whitespace-only message
 * — or one that only ever produced thinking — is the "empty response" failure.
 */
export declare function hasVisibleAssistantContent(message: AssistantMessage): boolean;
interface StreamRetryOptions {
    signal?: AbortSignal;
    providerRetryWait?: (delayMs: number, signal?: AbortSignal) => Promise<void>;
    acceptEmptyResponse?: boolean;
}
/** Controls which replay-safe provider results may issue a fresh request. */
export interface ReplaySafeStreamRetryPolicy {
    /** Retry benign terminal stops that contain no visible output. */
    retryEmptyCompletion?: boolean;
    /** Retry transient provider errors before output is committed. */
    retryProviderErrors?: boolean;
    /** Maximum transient provider-error retries; empty completions keep their shared fixed budget. */
    maxProviderErrorRetries?: number;
}
/**
 * Re-issues a fresh provider request only while the current attempt remains
 * replay-safe. Buffered pre-output events from discarded attempts never reach
 * consumers.
 */
export declare function withReplaySafeStreamRetry<M, O extends StreamRetryOptions>(model: M, context: Context, options: O | undefined, attempt: (model: M, context: Context, options?: O) => AssistantMessageEventStream, policy: ReplaySafeStreamRetryPolicy): AssistantMessageEventStream;
export {};