import type { DelegateTaskStreamEvent, DelegateTaskUsage } from './types';
/**
 * Parses Agent sandbox `--output-format stream-json` output into typed events.
 *
 * Agent sandbox emits one JSON object per line. This parser converts each line
 * into zero or more DelegateTaskStreamEvent objects and accumulates token
 * usage/cost across the full run.
 *
 * Designed for use both in real-time streaming (parse each line as it arrives)
 * and post-hoc parsing (parse all stdout lines after execution completes).
 */
export declare class StreamParser {
    private accumulatedUsage;
    private lastResponse;
    /**
     * Parse a single line of Agent sandbox stream-json output into zero or more
     * DelegateTaskStreamEvents. Returns an empty array for empty lines, invalid
     * JSON, or unknown message types.
     */
    parseLine(line: string): DelegateTaskStreamEvent[];
    /** Return a copy of the usage accumulated across all parsed messages. */
    getAccumulatedUsage(): DelegateTaskUsage;
    /** Return the last assistant response text seen in the stream. */
    getLastResponse(): string;
}