import { LoLEvent } from "../../data/LoLEvents.js";
export interface Subscription {
    unsubscribe(): void;
    readonly filter?: (e: LoLEvent) => boolean;
    readonly eventHandler: (event: LoLEvent) => void;
}
export type FetchOptions = {
    /**
     * Interval in milliseconds | default: 1000
     */
    interval?: number;
    /**
     * Max retries before giving up | default: 100
     */
    maxRetries?: number;
    /**
     * Callback for errors.
     */
    onError?: (err: Error) => void;
    /**
     * Callback for max retries reached
     */
    onMaxRetriesReached?: (err: Error) => void;
    /**
     * Disables error logging to console
     */
    disableErrorLogging?: boolean;
};
/**
 * Handles fetching of events from the Riot API and notifies observers about new events
 */
export declare class LoLEventManager {
    private readonly fetchInterval;
    private readonly maxRetries;
    private readonly onError?;
    private readonly onMaxRetriesReached?;
    private readonly disableErrorLogging;
    private timer?;
    private observers;
    private latestEventIndex;
    private retryCount;
    private running;
    private inFlight;
    constructor(fetchOptions?: FetchOptions);
    isFetching(): boolean;
    /**
     * Starts fetching events from the Riot API. Fetching stops when max retries reached or is manually stopped.
     */
    startFetching(): void;
    private tick;
    /**
     * Stops fetching events.
     */
    stopFetching(): void;
    /**
     * Subscribe to new events
     * @param eventHandler event handler
     * @param filter optional filter function. Only events that pass the filter will be notified
     */
    subscribe(eventHandler: (event: LoLEvent) => void, filter?: (e: LoLEvent) => boolean): Subscription;
    /**
     * Unsubscribe from events. Better use the returned subscription object from {@link subscribe}
     * @param eventHandler event handler to unsubscribe
     * @param filter optional filter function. Only events that pass the filter will be notified
     */
    unsubscribe(eventHandler: (event: LoLEvent) => void, filter?: (e: LoLEvent) => boolean): void;
}
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