import type { HarnessStreamPart, RunContext, Session } from '../types/index.js';
import type { HookRunner } from '../hooks/HookRunner.js';
import type { ConversationEventLog } from '../foundation/ConversationEventLog.js';
export interface StreamEmitterConfig {
    hookRunner: HookRunner;
    eventLog: ConversationEventLog;
    hasStreamPartHook: boolean;
    outputRedactions?: Array<{
        re: RegExp;
        replacement: string;
    }>;
    redactCarryKey: string;
    redactLookbehind: number;
    saveSessionCheckpoint: (session: Session) => Promise<void>;
}
/**
 * Hot-path optimized stream emitter.
 * Provides a fast path for text-delta events by skipping unnecessary
 * async hook calls and checkpoint checks when no stream part hooks are configured.
 */
export declare class StreamEmitter {
    private hookRunner;
    private eventLog;
    private hasStreamPartHook;
    private outputRedactions?;
    private redactCarryKey;
    private redactLookbehind;
    private saveCheckpoint;
    constructor(config: StreamEmitterConfig);
    emit(context: RunContext, part: HarnessStreamPart): AsyncGenerator<HarnessStreamPart>;
    private emitCore;
    private applyOutputRedactions;
}