import type { UpdateChoice, UpdatePrompt } from './update-prompt.js';
import { type UpdateState } from './update-state.js';
export declare function compareCalVer(a: string, b: string): number;
export declare function isUpdateDevMode(): boolean;
export interface CheckServerUpdateDeps {
    prompt: UpdatePrompt;
    getLatest?: () => string | null;
    spawnInstall?: () => void;
    loadState?: () => UpdateState | null;
    saveState?: (s: UpdateState) => void;
    now?: () => string;
}
export interface CheckServerUpdateResult {
    action: UpdateChoice | null;
    latestVersion: string | null;
}
export declare function checkServerUpdate(deps: CheckServerUpdateDeps): Promise<CheckServerUpdateResult>;