/**
 * JSON Reporter — Structured JSON test report with metadata.
 * @since 4.5.0
 */
import type { SuiteResult } from '../types';
export interface JSONReport {
    version: string;
    timestamp: string;
    suite: {
        name: string;
        total: number;
        passed: number;
        failed: number;
        skipped: number;
        passRate: number;
        duration_ms: number;
        totalCost: number;
    };
    tests: JSONTestEntry[];
    summary: {
        slowest: {
            name: string;
            duration_ms: number;
        } | null;
        mostTokens: {
            name: string;
            tokens: number;
        } | null;
        totalTokens: number;
        totalAssertions: number;
        failedAssertions: number;
    };
}
export interface JSONTestEntry {
    name: string;
    passed: boolean;
    skipped: boolean;
    duration_ms: number;
    tags: string[];
    assertions: {
        name: string;
        passed: boolean;
        expected?: any;
        actual?: any;
        message?: string;
    }[];
    error?: string;
    tokens?: {
        input: number;
        output: number;
    };
    cost?: number;
    steps?: number;
}
/**
 * Generate a structured JSON report from suite results.
 */
export declare function reportJSON(result: SuiteResult): string;
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