export function isString(p: any): p is string {
  return typeof p === 'string'
}

export function isNumber(p: any): p is number {
  return typeof p === 'number'
}

export function isBoolean(p: any): p is boolean {
  return typeof p === 'boolean'
}

export function isUndefined(p: any): p is undefined {
  return typeof p === 'undefined'
}

export function isNull(p: any): p is null {
  return p === null
}

export function isArray(p: any): p is [] {
  return Array.isArray(p)
}