import { type ManualForwardPatch, type NatSettingsFile } from './types.js';
/**
 * Atomic JSON store for `nat.json` — write to `<path>.tmp`, then rename.
 *
 * Concurrency assumption: only one cadre-host process owns a given rootDir.
 */
export declare class NatStore {
    private readonly path;
    private cache;
    constructor(rootDir: string);
    filePath(): string;
    /** Load (with caching). A missing file returns defaults. */
    load(): NatSettingsFile;
    /** Persist current settings atomically. */
    save(state: NatSettingsFile): void;
    /** Patch and persist (validation lives here). `forwards` is edited through `setForward`. */
    update(patch: Partial<Omit<NatSettingsFile, 'version' | 'forwards'>>): NatSettingsFile;
    /**
     * Apply a manual-forward patch for one node: a number sets that port's
     * external port, `null` clears it, an absent key leaves it alone. An entry
     * with no ports left is removed.
     */
    setForward(nodeId: string, patch: ManualForwardPatch): NatSettingsFile;
    /** Drop a node's manual forward entry. No-op (no write) when there is none. */
    deleteForward(nodeId: string): NatSettingsFile;
}