/**
 * Shared risk classification functions.
 * Extracted from tool-level local functions to enable direct unit testing.
 */
export type RiskLevel = "LOW" | "MEDIUM" | "HIGH";
export interface RiskDimension {
    level: RiskLevel;
    detail: string;
}
export declare function classifyChangeFrequency(fileChanges: number, allHotspots: {
    changeCount: number;
}[]): RiskDimension;
export declare function classifyChurn(fileChurn: number, allChurn: {
    totalChurn: number;
}[]): RiskDimension;
export declare function classifyKnowledgeRisk(contributorCount: number, topContributorPercentage: number): RiskDimension;
export declare function classifyCoupling(coChangeCount: number): RiskDimension;
export declare function classifyStaleness(daysSinceLastChange: number): RiskDimension;
export declare function overallRisk(dimensions: RiskDimension[]): RiskLevel;
export declare function riskLabel(level: RiskLevel): string;
export declare function classifyConflictFrequency(mergeAppearances: number, totalMerges: number): RiskDimension;
export declare function classifyCoordinationCost(score: number, allScores: number[]): RiskLevel;
/**
 * Classify expertise decay risk for a directory.
 *
 * @param busFactor - number of contributors needed to cover 50% of commits
 * @param activeOwnerCount - number of currently active owners
 * @param totalOwnerCount - total number of owners
 */
export declare function classifyExpertiseDecay(busFactor: number, activeOwnerCount: number, totalOwnerCount: number): RiskLevel;
export declare function classifyRevertRatio(revertCount: number, totalCommits: number): RiskDimension;
export declare function classifyChurnTrend(recentChurn: number, olderChurn: number): RiskDimension;
export declare function classifyIntegrationStyle(mergeRatio: number, mergesPerWeek: number): string;