/**
 * Abstraction for fetching the latest published version of a package.
 *
 * The default implementation uses `npm view`; tests can substitute a
 * stub that returns a fixed version string.
 */
export interface VersionSource {
    getLatestVersion(packageName: string): Promise<string>;
}
/**
 * Fetches the latest version of a package from the npm registry
 * by shelling out to `npm view <package> version`.
 *
 * `--prefer-online` is passed so npm always fetches from the registry
 * rather than serving a stale cached result. This matters in long-running
 * server processes (e.g. Railway) where the npm cache may be populated
 * with an old version from the initial install.
 */
export declare class NpmVersionSource implements VersionSource {
    /** @throws When the npm CLI exits non-zero or returns an empty string. */
    getLatestVersion(packageName: string): Promise<string>;
}
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