import type { Violation } from './violation';
export type WaiverStatus = 'requested' | 'approved' | 'rejected' | 'expired';
export interface Waiver {
    readonly waiverRef: string;
    readonly version: number;
    readonly fingerprint: string;
    readonly status: WaiverStatus;
    readonly reason: string;
    readonly requestedBy: string;
    readonly requestedAt: string;
    readonly approvedBy?: string;
    readonly approvedAt?: string;
    readonly expiresAt: string;
    readonly supersedes?: number;
}
export declare class WaiverTransitionError extends Error {
    constructor(message: string);
}
export interface RequestWaiverInput {
    readonly waiverRef: string;
    readonly fingerprint: string;
    readonly reason: string;
    readonly requestedBy: string;
    readonly requestedAt: string;
    readonly expiresAt: string;
}
export declare function requestWaiver(input: RequestWaiverInput): Waiver;
export declare function approveWaiver(waiver: Waiver, approvedBy: string, approvedAt: string): Waiver;
export declare function rejectWaiver(waiver: Waiver): Waiver;
export interface ReviseWaiverInput {
    readonly reason?: string;
    readonly requestedBy: string;
    readonly requestedAt: string;
    readonly expiresAt: string;
}
export declare function reviseWaiver(current: Waiver, input: ReviseWaiverInput): Waiver;
export declare function isExpired(waiver: Waiver, now: string): boolean;
export declare function effectiveStatus(waiver: Waiver, now: string): WaiverStatus;
export declare function isWaiverActive(waiver: Waiver, now: string): boolean;
export interface IWaiverStore {
    list(fingerprint: string): readonly Waiver[];
    all(): readonly Waiver[];
    put(waiver: Waiver): void;
}
export declare class InMemoryWaiverStore implements IWaiverStore {
    private readonly byFingerprint;
    constructor(seed?: readonly Waiver[]);
    list(fingerprint: string): readonly Waiver[];
    all(): readonly Waiver[];
    put(waiver: Waiver): void;
}
export declare function activeWaiverFor(store: IWaiverStore, fingerprint: string, now: string): Waiver | undefined;
export interface WaiverSuppression {
    readonly violation: Violation;
    readonly waiver: Waiver;
}
export interface ApplyWaiversResult {
    readonly retained: readonly Violation[];
    readonly suppressed: readonly WaiverSuppression[];
}
export declare function applyWaivers(violations: readonly Violation[], store: IWaiverStore, now: string): ApplyWaiversResult;
export interface FreezeWaivedResult {
    readonly violations: readonly Violation[];
    readonly suppressed: readonly WaiverSuppression[];
    readonly unmatched: readonly string[];
}
export declare function freezeWaivedViolations(violations: readonly Violation[], store: IWaiverStore, now: string): FreezeWaivedResult;