export interface NpmInvocation {
    readonly command: string;
    readonly prefixArgs: readonly string[];
}
export interface NpmResolverOptions {
    readonly platform: NodeJS.Platform;
    readonly execPath: string;
    readonly env: NodeJS.ProcessEnv;
    canExecute(candidate: string): Promise<boolean>;
}
export interface GroupXUpdateDependencies {
    readonly latestVersion: () => Promise<string>;
    readonly installVersion: (version: string) => Promise<void>;
    readonly stdout: (line: string) => void;
}
export interface GroupXUpdateOptions {
    readonly currentVersion: string;
    readonly checkOnly?: boolean;
}
export declare function compareStableVersions(left: string, right: string): number;
/** Locate npm without passing a .cmd/.bat shim through a shell on Windows. */
export declare function resolveNpmInvocation(options: NpmResolverOptions): Promise<NpmInvocation>;
export declare function systemGroupXUpdateDependencies(): Promise<GroupXUpdateDependencies>;
export declare function runGroupXUpdate(options: GroupXUpdateOptions, dependencies?: GroupXUpdateDependencies): Promise<"current" | "newer" | "available" | "updated">;
//# sourceMappingURL=update.d.ts.map