import type { Gate, HealthGrade, RunArtifact } from "./types.js";
export interface HistoryEntry {
    date: string;
    targetId: string;
    healthScore: number;
    grade: HealthGrade;
    toolCount: number;
    promptCount: number;
    resourceCount: number;
    gate: Gate;
}
export interface HistoryFile {
    version: 1;
    entries: HistoryEntry[];
}
export interface TrendInfo {
    current: HistoryEntry;
    previous?: HistoryEntry;
    direction: "up" | "down" | "stable" | "new";
    delta: number;
}
export declare function defaultHistoryPath(cwd?: string): string;
export declare function readHistory(historyPath?: string): Promise<HistoryFile>;
export declare function appendHistory(entry: HistoryEntry, historyPath?: string): Promise<void>;
export declare function buildHistoryEntry(artifact: RunArtifact): HistoryEntry;
export declare function getTrend(targetId: string, history: HistoryFile): TrendInfo | null;
export declare function renderTrendLabel(trend: TrendInfo): string;