import { Completion, Log, TraceLog, UpdateLog } from './types';
/**
 * Generates a unique trace ID for each chain of requests.
 * @returns {string} A unique UUID v4 string.
 */
export declare function genTraceId(): string;
/**
 * Converts a Date object to an ISO 8601 formatted string.
 * @param {Date} date - The date to convert.
 * @returns {string} The date in ISO 8601 format.
 */
export declare function toDateTimeString(date: Date): string;
/**
 * Creates an async generator that limits concurrent execution of promises.
 * @param {number} concurrency - The maximum number of concurrent executions.
 * @param {Iterable<T>} iterable - The iterable of input items.
 * @param {(item: T) => Promise<R>} iteratorFn - The async function to execute for each item.
 * @returns {AsyncGenerator<R, void, unknown>} An async generator yielding results.
 * @throws {Error} When attempting to consume with no promises executing.
 */
export declare function asyncPool<T, R>(concurrency: number, iterable: Iterable<T>, iteratorFn: (item: T) => Promise<R>): AsyncGenerator<R, void, unknown>;
export type LogData = Completion & TraceLog & Log;
/**
 * Serializes metadata values in the log data.
 * @param {LogData} logData - The log data to serialize.
 * @returns {LogData} The log data with serialized metadata values.
 */
export declare function serializeMetadataValues(logData: LogData): LogData;
/**
 * Serializes values in a metadata object.
 * @param {{ [key: string]: any }} metadata - The metadata object to serialize.
 * @returns {{ [key: string]: string }} An object with all values serialized to strings.
 */
export declare function serializeValues(metadata: {
    [key: string]: any;
}): {
    [key: string]: string;
};
/**
 * Serializes metadata values in an update log.
 * @param {UpdateLog} logData - The update log data to serialize.
 * @returns {UpdateLog} The update log with serialized metadata values.
 */
export declare function serializeMetadataValuesUpdate(logData: UpdateLog): UpdateLog;