code-exercises-js/dist/types/Event.d.ts

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import IEvent from "./IEvent";
export default class Event<T> implements IEvent<T> {
    private handlers;
    on(handler: {
        (data: T): void;
    }): void;
    off(handler: {
        (data?: T): void;
    }): void;
    trigger(data: T): void;
    expose(): Event<T>;
}