/**
 * PR Impact Score (v1.1.0)
 *
 * Scores PRs by risk using multiple factors:
 * - Diff size (lines added/removed)
 * - File churn (files changed frequently in past PRs)
 * - Author experience (familiarity with touched files)
 * - Blast radius (number of files + cross-module changes)
 * - Historical failures (files that were reverted/had follow-up fixes)
 */
export type RiskLevel = 'low' | 'medium' | 'high' | 'critical';
export interface ImpactFactor {
    name: string;
    score: number;
    weight: number;
    description: string;
}
export interface ImpactResult {
    /** Overall impact score 1-10 */
    score: number;
    /** Risk classification */
    riskLevel: RiskLevel;
    /** Individual factor breakdowns */
    factors: ImpactFactor[];
    /** Human-readable summary */
    summary: string;
}
export interface ImpactPRInput {
    title: string;
    description: string;
    files: string[];
    diff?: string;
    linesAdded?: number;
    linesRemoved?: number;
    author?: string;
}
export declare class HistoricalTracker {
    /** File → number of times it appeared in PRs */
    private fileChurn;
    /** File → number of times PRs touching it were reverted or had fixes */
    private fileFailures;
    /** Author → Set of files they've touched */
    private authorFiles;
    /** Total PRs recorded */
    private totalPRs;
    /**
     * Record a PR for historical tracking
     */
    recordPR(author: string, files: string[], wasReverted?: boolean): void;
    /**
     * Record that a file had a follow-up fix (indicates original PR was risky)
     */
    recordFailure(files: string[]): void;
    /**
     * Get churn count for a file (how often it's been changed)
     */
    getFileChurn(file: string): number;
    /**
     * Get failure count for a file
     */
    getFileFailures(file: string): number;
    /**
     * Check how many of the given files an author has previously touched
     */
    getAuthorFamiliarity(author: string, files: string[]): number;
    /**
     * Get average churn across all tracked files
     */
    getAverageChurn(): number;
    getTotalPRs(): number;
    /**
     * Export for persistence
     */
    exportState(): {
        fileChurn: Record<string, number>;
        fileFailures: Record<string, number>;
        authorFiles: Record<string, string[]>;
        totalPRs: number;
    };
    /**
     * Import from persistence
     */
    importState(state: {
        fileChurn: Record<string, number>;
        fileFailures: Record<string, number>;
        authorFiles: Record<string, string[]>;
        totalPRs: number;
    }): void;
}
export declare class ImpactScorer {
    private history;
    constructor(history?: HistoricalTracker);
    /**
     * Score the impact/risk of a PR
     */
    score(pr: ImpactPRInput): ImpactResult;
    /**
     * Record a PR for building historical data
     */
    recordPR(author: string, files: string[], wasReverted?: boolean): void;
    /**
     * Record a file failure (revert or follow-up fix)
     */
    recordFailure(files: string[]): void;
    /**
     * Get the history tracker for export/import
     */
    getHistory(): HistoricalTracker;
    private scoreDiffSize;
    private scoreBlastRadius;
    private scoreFileChurn;
    private scoreAuthorExperience;
    private scoreHistoricalFailures;
    private classifyRisk;
    private generateSummary;
}
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