types.ts

// copy from
import { isArray, isObject, isString } from '@vue/shared';
import { isNil } from 'lodash-unified';

export {
  isArray,
  isFunction,
  isObject,
  isString,
  isDate,
  isPromise,
  isSymbol,
} from '@vue/shared';

export { isVNode } from 'vue';

export const isUndefined = (val: any): val is undefined => val === undefined;
export const isBoolean = (val: any): val is boolean => typeof val === 'boolean';
export const isNumber = (val: any): val is number => typeof val === 'number';

export const isEmpty = (val: unknown) => (!val && val !== 0)
    || (isArray(val) && val.length === 0)
    || (isObject(val) && !Object.keys(val).length);

export const isElement = (e: unknown): e is Element => {
  if (typeof Element === 'undefined') return false;
  return e instanceof Element;
};

export const isPropAbsent = (prop: unknown): prop is null | undefined => isNil(prop);

export const isStringNumber = (val: string): boolean => {
  if (!isString(val)) {
    return false;
  }
  return !Number.isNaN(Number(val));
};