import type { CatalogEntry } from '../types/plugin.types.js';
export interface InstalledPluginRef {
    currentVersion: string;
    location: 'global' | 'npm' | 'project' | 'user';
    name: string;
    packageName: string;
}
export interface OutdatedPlugin {
    currentVersion: string;
    integrity?: string;
    latestVersion: string;
    location: InstalledPluginRef['location'];
    name: string;
    packageName: string;
    source: 'npm' | 'registry';
}
/**
 * Pure function — no I/O.
 * Compares installed plugin versions against registry and npm latest maps,
 * returning only plugins where a newer version is available.
 * Registry is preferred over npm when both have a version.
 */
export declare function diffPluginVersions(installed: InstalledPluginRef[], catalog: Map<string, CatalogEntry>, npmLatest: Map<string, string>): OutdatedPlugin[];
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