declare interface Fn<T = any, R = T> {
  (...arg: T[]): R;
}

declare interface PromiseFn<T = any, R = T> {
  (...arg: T[]): Promise<R>;
}

declare interface IObj<T = any> {
  [key: string]: T;
  [key: number]: T;
}

declare function parseInt(s: string | number, radix?: number): number;

declare function parseFloat(string: string | number): number;

declare type Dictionary<T> = Record<string, T>;

declare type Nullable<T> = T | null;

declare type RefInstanceType<T> = {
  $: T;
} | null;

declare type RefType<T> = T | null;

declare type CustomizedHTMLElement<T> = HTMLElement & T;

declare type Indexable<T = any> = {
  [key: string]: T;
};

declare type Hash<T> = Indexable<T>;

declare type DeepPartial<T> = {
  [P in keyof T]?: DeepPartial<T[P]>;
};

// type DeepPartial<T> = T extends Function
//   ? T
//   : T extends object
//   ? { [K in keyof T]?: DeepPartial<T[K]> }
//   : T;

declare type LabelValueOptions = {
  label: string;
  value: any;
}[];

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

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

declare type TimeoutHandle = ReturnType<typeof setTimeout>;

declare type IntervalHandle = ReturnType<typeof setInterval>;
