import type { OutputEvent, ResultEvent } from './types';
export interface AssistantStreamState {
    lastAssistantText?: string | undefined;
    lastAssistantThinking?: string | undefined;
    lastToolId?: string | null | undefined;
}
export interface AssistantSnapshot {
    readonly text: string;
    readonly thinking: string;
}
export declare function assistantSnapshot(message: Record<string, unknown>): AssistantSnapshot;
export declare function snapshotDelta(previous: string, current: string): string | null;
export declare function resetAssistantSnapshot(message: Record<string, unknown> | null, state: AssistantStreamState): void;
export declare function parseAssistantDelta(event: Record<string, unknown>, state: AssistantStreamState): OutputEvent | null;
export interface AssistantSnapshotOptions {
    readonly retainPreviousOnEmpty?: boolean;
}
export declare function emitAssistantSnapshot(message: Record<string, unknown>, state: AssistantStreamState, options?: AssistantSnapshotOptions): readonly OutputEvent[];
export declare function parseToolExecutionStart(event: Record<string, unknown>, state: AssistantStreamState): OutputEvent;
export declare function parseToolExecutionUpdate(event: Record<string, unknown>, state: AssistantStreamState): OutputEvent | null;
export declare function parseToolExecutionEnd(event: Record<string, unknown>, state: AssistantStreamState): OutputEvent;
export interface TurnEndOptions {
    readonly failureMessage: string;
    readonly resultFallback?: string | null;
}
export declare function parseTurnEndResult(event: Record<string, unknown>, options: TurnEndOptions): ResultEvent;
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