export interface EnsureLoginDeps {
    /** Resolve the current token (env override or machine config), or undefined. */
    currentToken: () => Promise<string | undefined>;
    /** Run the interactive login flow (loopback OAuth), persisting a token. */
    runLogin: () => Promise<void>;
    /** Surface a line to the user (stderr, so it never pollutes machine-readable stdout). */
    notify: (message: string) => void;
}
/** No-op when a token is already present; otherwise log-and-login before returning. */
export declare function ensureLoggedIn(deps: EnsureLoginDeps): Promise<void>;