/**
 * Pure scoring function for file stability prediction.
 * Combines revert ratio, churn trend, code age, and conflict frequency
 * into a single stability score (0-100).
 */
import type { RiskLevel } from "./risk-classifiers.js";
export interface StabilitySignals {
    revertRatio: number;
    churnTrendRatio: number;
    codeAgeDays: number;
    conflictRatio: number;
}
export interface StabilityResult {
    score: number;
    riskLevel: RiskLevel;
    penalties: {
        revert: number;
        churnTrend: number;
        codeAge: number;
        conflict: number;
    };
}
/**
 * Predict file stability from 4 signals.
 * Score starts at 100 and is reduced by penalties.
 *
 * - Revert ratio penalty: up to 30 points
 * - Churn trend penalty: up to 25 points
 * - Code age penalty (too young = unstable): up to 20 points
 * - Conflict frequency penalty: up to 25 points
 */
export declare function predictStability(signals: StabilitySignals): StabilityResult;