/**
 * Single source of truth for security score / grade calculation.
 *
 * Goals:
 *   1. Same finding counts produce the same score across scan-directory,
 *      check-project, full-audit, and CLI output.
 *   2. Severity caps so a critical finding cannot ever look like a clean run
 *      (1+ critical → max C/60, 1+ high → max B/75).
 *   3. Optional exponential density decay (`scoring.densityModel: "exponential"`
 *      in .guardviberc) for projects that want resolution past density 5
 *      instead of the linear cliff.
 *
 * Default density formula stays linear so existing CI thresholds don't shift.
 */
export type DensityModel = "linear" | "exponential";
export interface ScoreOptions {
    /** Density curve. "linear" (default) is `100 - min(density, 5) * 20`.
     *  "exponential" is `100 * exp(-density / 3)` — smoother, no cliff. */
    densityModel?: DensityModel;
}
/** Severity caps applied AFTER the density-derived score. */
export declare const CRITICAL_SCORE_CAP = 60;
export declare const HIGH_SCORE_CAP = 75;
export declare function calculateScore(critical: number, high: number, medium: number, fileCount?: number, options?: ScoreOptions): number;
export declare function scoreToGrade(score: number): string;