declare interface Fn<T = any, R = T> {

  (...arg: T[]): R;

}



declare interface PromiseFn<T = any, R = T> {

  (...arg: T[]): Promise<R>;

}



declare type RefType<T> = T | null;



declare type LabelValueOptions = {

  label: string;

  value: any;

  [key: string]: string | number | boolean;

}[];



declare type EmitType = (event: string, ...args: any[]) => void;



declare type TargetContext = '_self' | '_blank';



declare interface ComponentElRef<T extends HTMLElement = HTMLDivElement> {

  $el: T;

}



declare type ComponentRef<T extends HTMLElement = HTMLDivElement> = ComponentElRef<T> | null;



declare type ElRef<T extends HTMLElement = HTMLDivElement> = Nullable<T>;