export interface ViewerFreshness {
    generatedAt: string;
    analyzedCommit: string | null;
    currentCommit: string | null;
    status: 'current' | 'stale' | 'unassessable';
    filesChangedSince: number | null;
}
export declare function buildViewerFreshness(input: {
    generatedAt: string;
    analyzedCommit: string | null;
    currentCommit: string | null;
    filesChangedSince: number | null;
    artifactPredatesAnalyzedCommit: boolean | null;
}): ViewerFreshness;
export declare function readViewerFreshness(rootPath: string, analysisDir: string, artifactPath: string): Promise<ViewerFreshness>;
export declare function setViewerFreshnessHeaders(setHeader: (name: string, value: string) => void, freshness: ViewerFreshness): void;
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