export declare function isNullOrUndefined(o: unknown): boolean;
export declare function isEmptyString(s: string): boolean;
export declare function isNotFoundError(e: unknown): boolean;
export declare function isBuiltInNamespace(namespace: string): boolean;
export declare function isNetworkError(e: Record<string, unknown>): boolean;
export declare function isRetriableError(e: Record<string, unknown>): boolean;