/**
 * meta-stats.ts — Context overhead KPIs
 *
 * Detects files that Claude Code loads into context automatically
 * (CLAUDE.md, settings, AGENTS.md, etc.) and estimates their token cost.
 * Keeps a rolling history for sparklines (last 30 snapshots).
 */
export interface MetaAlert {
    level: 'info' | 'warning' | 'critical';
    message: string;
    metric: string;
}
export interface ContextFileInfo {
    label: string;
    tokens: number;
}
export interface MetaStats {
    ts: number;
    contextFiles: ContextFileInfo[];
    contextOverheadTokens: number;
    alerts: MetaAlert[];
}
export interface MetaSnapshot {
    ts: number;
    contextOverheadTokens: number;
}
export declare function computeMetaStats(sessionCwd?: string, contextPct?: number): MetaStats;
export declare function getMetaHistory(): MetaSnapshot[];