function depd(namespace) {
  if (!namespace) {
    throw new TypeError('argument namespace is required')
  }

  var stack = getStack()
  var site = callSiteLocation(stack[1])
  var file = site[0]

  function deprecate(message) {
    // call to self as log
    log.call(deprecate, message)
  }

  deprecate._file = file
  deprecate._ignored = isignored(namespace)
  deprecate._namespace = namespace
  deprecate._traced = istraced(namespace)
  deprecate._warned = Object.create(null)

  deprecate.function = wrapfunction
  deprecate.property = wrapproperty

  return deprecate
}
Create deprecate for namespace in caller.