import { RemoveListenerCallback } from '../types';
export declare const isDev: boolean;
export type Events<F> = {
    toArray: () => F[];
    length: number;
    push: (fn: F) => RemoveListenerCallback;
    call: (...arg: any) => void;
};
export declare function createEvents<F extends Function>(): Events<F>;
export declare const readOnly: <T extends unknown>(obj: T) => T;
export declare function warning(cond: boolean, message: string): void;