export type EventName = "datafile_set" | "context_set" | "sticky_set";
export type EventDetails = Record<string, unknown>;
export type EventCallback = (details: EventDetails) => void;
export type Listeners = Record<EventName, EventCallback[]> | {};
export declare class Emitter {
    listeners: Listeners;
    constructor();
    on(eventName: EventName, callback: EventCallback): () => void;
    trigger(eventName: EventName, details?: EventDetails): void;
    clearAll(): void;
}