import type { Attributes } from "@opentelemetry/api";
export declare const NULL_SENTINEL = "$@null((";
export declare const CIRCULAR_REFERENCE_SENTINEL = "$@circular((";
export declare function flattenAttributes(obj: unknown, prefix?: string, maxAttributeCount?: number, maxDepth?: number): Attributes;
export declare function unflattenAttributes(obj: Attributes, filteredKeys?: string[], maxDepth?: number): Record<string, unknown> | string | number | boolean | null | undefined;
export declare function primitiveValueOrflattenedAttributes(obj: Record<string, unknown> | Array<unknown> | string | boolean | number | undefined, prefix: string | undefined): Attributes | string | number | boolean | undefined;