/**
 * Writes a key into the credentials file, replacing any existing entry.
 * Rewrites in place rather than appending, so re-authenticating does not leave
 * a stale token above the new one — the parser takes the last occurrence, and
 * relying on that is a trap.
 */
export declare const upsertCredential: (key: string, value: string, file?: string) => void;
export interface AuthDependencies {
    write?: (line: string) => void;
    fetchImpl?: typeof fetch;
    /** Injected in tests so polling does not actually sleep. */
    sleep?: (ms: number) => Promise<void>;
    credsFile?: string;
}
export declare const runAuth: (argv: string[], deps?: AuthDependencies) => Promise<number>;
export declare const AuthCommand: {
    run(argv: string[]): Promise<void>;
};
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