export declare enum PipelineEvent {
    RunStart = "run.start",
    RunEnd = "run.end",
    ProcessorStart = "processor.start",
    ProcessorEnd = "processor.end",
    LLMCall = "llm.call",
    Error = "error"
}
export type EventHandler<T = any> = (payload?: T) => void | Promise<void>;
export interface RunStartPayload {
    context: any;
}
export interface RunEndPayload {
    context: any;
    duration: number;
}
export interface ProcessorStartPayload {
    processorName: string;
    context: any;
}
export interface ProcessorEndPayload {
    processorName: string;
    context: any;
    duration: number;
}
export interface LLMCallPayload {
    prompt: string;
    response: any;
    model: string;
    duration: number;
}
export interface ErrorPayload {
    error: Error;
    context?: any;
    stage?: 'run' | 'processor' | 'llm';
}