import type { AssistantMessage, Context } from "../types";
import { AssistantMessageEventStream } from "./event-stream";
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: a 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 EmptyCompletionRetryOptions {
    signal?: AbortSignal;
    providerRetryWait?: (delayMs: number, signal?: AbortSignal) => Promise<void>;
}
/**
 * Wrap a single-attempt provider stream with bounded empty-completion retries.
 * `attempt` MUST create a fresh request (and its own output message) on each
 * call so a retry never inherits stale metadata from an empty attempt.
 */
export declare function withEmptyCompletionRetry<M, O extends EmptyCompletionRetryOptions>(model: M, context: Context, options: O | undefined, attempt: (model: M, context: Context, options?: O) => AssistantMessageEventStream): AssistantMessageEventStream;
export {};