import type { ExecResult } from '../types/index.js';
import type { CodexEvent } from './shared.js';
export declare function extractCodexUsage(events: CodexEvent[]): {
    input: number;
    cached: number;
    output: number;
};
/**
 * Match @openai/codex-sdk's `finalResponse`: the latest completed
 * agent_message is the answer. Earlier messages remain available in `turns`.
 */
export declare function extractCodexFinalOutput(events: CodexEvent[]): string;
export declare function extractCodexProtocolError(events: CodexEvent[]): string | undefined;
export declare function validateCodexProtocol(events: CodexEvent[]): string | undefined;
export declare function extractCodexStopReason(events: CodexEvent[]): string;
export declare function sumCodexElapsed(resultEvents: CodexEvent[], wallClock: number): number;
export interface BuildCodexResultOptions {
    events: CodexEvent[];
    wallClockDurationMs: number;
    source: 'codex --json' | 'codex-sdk';
    malformedLineCount?: number;
    forcedError?: string;
}
export declare function buildCodexResult({ events, wallClockDurationMs, source, malformedLineCount, forcedError, }: BuildCodexResultOptions): ExecResult;