export interface CredentialDirectoryWatcher {
    close(): void;
    on(event: "error", listener: (error: Error) => void): unknown;
}
export type CredentialDirectoryWatch = (directory: string, listener: (event: string, filename: string | Buffer | null) => void) => CredentialDirectoryWatcher;
export interface CredentialStoreObserver {
    close(): void;
}
/**
 * Observe the shared credential file through its directory so an in-place
 * write or replacement produces the same refresh signal. This deliberately
 * has no polling/retry fallback. A missing directory returns no observer so
 * the caller can arm it after a known in-process credential write.
 */
export declare function observeCredentialStore(filePath: string, onChange: () => void | Promise<void>, options?: {
    watchDirectory?: CredentialDirectoryWatch;
    debounceMs?: number;
    onError?: (error: unknown) => void;
    onUnavailable?: () => void;
}): CredentialStoreObserver | null;
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