element-plus/packages/utils/types.ts

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

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

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))
}

export const isWindow = (val: unknown): val is Window => val === window