import type { GenericObject } from "../types";
/**
 * Reports that the current user performed a custom named event.
 *
 * @param eventName - The identifier for the event to track. Value is limited to 255 characters in length,
 *   cannot begin with a $, and can only contain alphanumeric characters and punctuation.
 * @param eventProperties - Hash of properties for this event. Keys are limited to 255 characters in length, cannot begin
 *   with a $, and can only contain alphanumeric characters and punctuation. Values can be numeric, boolean, Date objects,
 *   strings 255 characters or shorter, or nested objects whose values can be numeric, boolean, Date objects, arrays, strings,
 *   or null. Total size of event properties cannot exceed 50KB.
 *
 * @returns Resolves to a boolean that indicates whether the event was successfully enqueued. Resolves to undefined
 *   if the SDK is not initialized.
 */
export declare function logCustomEvent(eventName: string, eventProperties?: GenericObject): Promise<boolean | undefined>;