export declare function resolveOpencodeCacheDir(): string;
export declare function fetchLatestVersion(): Promise<string | null>;
export declare function getCurrentVersion(): string;
export interface UpgradeResult {
    upgraded: boolean;
    from: string;
    to: string;
    message: string;
}
export interface UpgradeCheckResult {
    current: string;
    latest: string | null;
    updateAvailable: boolean;
}
export declare function compareVersions(a: string, b: string): number;
export declare function checkForUpdate(): Promise<UpgradeCheckResult>;
export declare function updateCachePackageJson(cacheDir: string, version: string): void;
export declare function performUpgrade(runInstall: (cacheDir: string, version: string) => Promise<{
    exitCode: number;
    stderr: string;
}>): Promise<UpgradeResult>;
export declare function formatUpgradeCheck(check: UpgradeCheckResult): string;
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