export type UpdateStatus = {
    state: "checking";
    packageName: string;
    currentVersion: string;
} | {
    state: "current";
    packageName: string;
    currentVersion: string;
    latestVersion: string;
    checkedAt: string;
} | {
    state: "available";
    packageName: string;
    currentVersion: string;
    latestVersion: string;
    installCommand: string;
    checkedAt: string;
} | {
    state: "installed";
    packageName: string;
    currentVersion: string;
    latestVersion: string;
    checkedAt: string;
} | {
    state: "disabled";
    packageName: string;
    currentVersion: string;
} | {
    state: "unavailable";
    packageName: string;
    currentVersion: string;
    error: string;
    checkedAt: string;
};
export type CheckForUpdateOptions = {
    packageName?: string;
    currentVersion?: string;
    registryUrl?: string;
    timeoutMs?: number;
    fetchImpl?: typeof fetch;
    disabled?: boolean;
};
export type InstallUpdateOptions = {
    packageName?: string;
    registryUrl?: string;
    npmCommand?: string;
};
export type InstallUpdateResult = {
    command: string;
    stdout: string;
    stderr: string;
};
export declare function checkForUpdate(options?: CheckForUpdateOptions): Promise<UpdateStatus>;
export declare function installLatestUpdate(options?: InstallUpdateOptions): Promise<InstallUpdateResult>;
export declare function buildInstallCommand(packageName?: string): string;
export declare function updateStatusLabel(status: UpdateStatus): string;
export declare function compareSemver(left: string, right: string): -1 | 0 | 1;