/**
 * Performance metric formatting for LLM output.
 * Follows PASS/FAIL pattern from visual-tools.
 */
import type { PerfSnapshot, PerfCompareResult, PerfMonitorResult, CrashEntry } from "./types.js";
/**
 * Format a performance snapshot as human-readable text.
 */
export declare function formatSnapshot(snapshot: PerfSnapshot): string;
/**
 * Format a performance comparison result with PASS/FAIL.
 */
export declare function formatCompare(result: PerfCompareResult): string;
/**
 * Format a performance monitor result.
 */
export declare function formatMonitor(result: PerfMonitorResult, platform: string): string;
/**
 * Format crash entries.
 */
export declare function formatCrashes(crashes: CrashEntry[], platform: string, since?: string): string;
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