service/src/utils/is.ts

export function isNumber<T extends number>(value: T | unknown): value is number {
  return Object.prototype.toString.call(value) === '[object Number]'
}

export function isString<T extends string>(value: T | unknown): value is string {
  return Object.prototype.toString.call(value) === '[object String]'
}

export function isNotEmptyString(value: any): boolean {
  return typeof value === 'string' && value.length > 0
}

export function isBoolean<T extends boolean>(value: T | unknown): value is boolean {
  return Object.prototype.toString.call(value) === '[object Boolean]'
}

export function isFunction<T extends (...args: any[]) => any | void | never>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object Function]'
}