export interface LastScan {
    date: string;
    totalCostUsdAllTime: number;
    totalCostUsdLast7Days: number;
    sessionsScanned: number;
    filesScanned: number;
    activeDetectorIds: string[];
    potentialSavingsUsd: number;
}
export declare function readLastScan(): LastScan | null;
export declare function writeLastScan(scan: LastScan): void;
export interface ScanDelta {
    daysSince: number;
    spendDeltaUsd: number;
    spendDeltaPct: number;
    fixedCount: number;
    newCount: number;
    returnedCount: number;
    fixedIds: string[];
    newIds: string[];
}
export declare function computeDelta(last: LastScan, current: {
    totalCostUsdLast7Days: number;
    activeDetectorIds: string[];
    potentialSavingsUsd: number;
}): ScanDelta;
export declare function printDelta(delta: ScanDelta, _last: LastScan): void;
export declare function printAliasHint(): void;
export declare function printSpendCreepWarning(currentDetectorIds: string[], lastDetectorIds: string[]): void;
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