import type { AnthropicStreamPreflightResult, StreamTerminalOutcome, StreamTerminalOutcomeTracker } from "../types/index.js";
/** Hold only pre-commit SSE frames so immediate upstream errors remain retryable. */
export declare function preflightAnthropicStream(reader: ReadableStreamDefaultReader<Uint8Array>): Promise<AnthropicStreamPreflightResult>;
export declare function createStreamTerminalOutcomeTracker(): StreamTerminalOutcomeTracker;
export declare function mergeStreamTerminalOutcome(outcome: StreamTerminalOutcome, sseErrorMessage?: string, messageStopReceived?: boolean): StreamTerminalOutcome;