import { RequiredKeys, OmitByValue, OptionalKeys, PickByValue } from 'utility-types';
export type Handler<Args> = Args extends null | undefined ? () => any : Args extends any[] ? (...args: Args) => any : (args: Args) => any;
export type EventArgs = {
    [key: string]: any;
};
export type EventNames<M extends EventArgs> = Extract<keyof M, string>;
/**
 * Get union type of keys from `M` that value matching `any[]`.
 */
export type NamesWithArrayArgs<M extends EventArgs> = RequiredKeys<PickByValue<M, any[]>>;
export type NotArrayValueMap<M extends EventArgs> = OmitByValue<M, any[]>;
export type OptionalNormalNames<M extends EventArgs> = OptionalKeys<NotArrayValueMap<M>>;
export type RequiredNormalNames<M extends EventArgs> = RequiredKeys<NotArrayValueMap<M>>;
export type OtherNames<M extends EventArgs> = EventNames<PickByValue<M, undefined>>;
export type UnknownNames<M extends EventArgs> = Exclude<string, EventNames<M>>;