export declare const merchantDuoPackage = "@merchantduo/code";
export type ReleaseFetch = (input: string, init?: RequestInit) => Promise<{
    ok: boolean;
    json(): Promise<unknown>;
}>;
export type PackageManager = "npm" | "pnpm";
export type ReleaseCommandRunner = (command: string, args: string[]) => {
    status: number | null;
    stdout: string;
};
export type MerchantDuoUpdateResult = {
    message: string;
    updated: boolean;
};
/** Fetch the current npm dist-tag without making startup depend on network health. */
export declare function latestMerchantDuoVersion(fetcher?: ReleaseFetch): Promise<string | undefined>;
export declare function isNewerMerchantDuoVersion(candidate: string, current: string): boolean;
/** A source checkout is deliberately updated by its owner, never by this CLI. */
export declare function isSourceCheckout(root?: string): boolean;
/**
 * Algorithm:
 * 1. Ask npm and pnpm for their global package roots.
 * 2. Match the resolved MerchantDuo package directory to exactly one root.
 * 3. Let only that owning package manager update the global package.
 */
export declare function globalPackageManager(packageDirectory: string, roots: Partial<Record<PackageManager, string | undefined>>): PackageManager | undefined;
export declare function detectGlobalPackageManager(packageDirectory?: string, runner?: ReleaseCommandRunner): PackageManager | undefined;
export declare function updateMerchantDuo(options: {
    checkOnly: boolean;
    currentVersion: string;
    packageDirectory?: string;
    fetcher?: ReleaseFetch;
    runner?: ReleaseCommandRunner;
}): Promise<MerchantDuoUpdateResult>;