import { AnalyticsUser } from './analytics-user';
import { Context, IDs, Message, PlatformAdatper } from './models';
import { TrackingPlan } from './tracking-plan';
/**
 * We use `TrackingPlan` instead of Validator here for best compile
 * time error checking in TypeScript. All the type information goes away
 * in JavaScript so has no impact on JS code
 */
export interface Config<T extends TrackingPlan> {
    adapter: PlatformAdatper;
    validator?: T;
    debug?: boolean;
    context?: Context;
    /**
     * Simplified middleware api that takes a message and returns another
     * Return `null` or `undefined` to swallow the message
     */
    middleware?: (message: Message) => Message | null | undefined;
}
export declare class Analytics<T extends TrackingPlan> {
    private config;
    private adapter;
    private validator?;
    constructor(config: Config<T>);
    user(userId: string | IDs, context?: Context): AnalyticsUser<T>;
    enqueueMessage(message: Message): void;
    flush(): Promise<any>;
    private error;
}
export declare class AnalyticsError extends Error {
}