import type { AirshipPluginWrapper } from './AirshipPlugin';
import type { CustomEvent } from './types';
/**
 * Airship analytics.
 */
export declare class AirshipAnalytics {
    private readonly plugin;
    constructor(plugin: AirshipPluginWrapper);
    /**
     * Associates an identifier.
     *
     * @param key The key.
     * @param identifier The identifier. `null` to remove.
     * @returns A promise.
     */
    associateIdentifier(key: string, identifier?: string): Promise<void>;
    /**
     * Tracks a screen.
     * @param screen The screen. `null` to stop tracking.
     * @returns A promise.
     */
    trackScreen(screen?: string): Promise<void>;
    /**
     * Adds a custom event.
     * @param event The custom event.
     * @return A promise that returns null if resolved, or an Error if the
     * custom event is rejected.
     */
    addCustomEvent(event: CustomEvent): Promise<void>;
    /**
     * Gets the Airship session ID. The session ID is a UUID that updates on foreground and background.
     * @returns A promise.
     */
    getSessionId(): Promise<string>;
}