export const isMap = (val: unknown): val is Map<any, any> => toTypeString(val) === "[object Map]"
export const isSet = (val: unknown): val is Set<any> => toTypeString(val) === "[object Set]"
export const isDate = (val: unknown): val is Date => toTypeString(val) === "[object Date]"
export const isRegExp = (val: unknown): val is RegExp => toTypeString(val) === "[object RegExp]"
export const isPlainObject = (val: unknown): val is Record<string, any> => toTypeString(val) === "[object Object]"

// --------------------------------------------
const objectToString = Object.prototype.toString
const toTypeString = (value: unknown): string => objectToString.call(value)