'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var wrappy = require('../wrappy/wrappy.js');

var once_1 = wrappy.default(once);
var strict = wrappy.default(onceStrict);

once.proto = once(function () {
  Object.defineProperty(Function.prototype, 'once', {
    value: function () {
      return once(this)
    },
    configurable: true
  });

  Object.defineProperty(Function.prototype, 'onceStrict', {
    value: function () {
      return onceStrict(this)
    },
    configurable: true
  });
});

function once (fn) {
  var f = function () {
    if (f.called) return f.value
    f.called = true;
    return f.value = fn.apply(this, arguments)
  };
  f.called = false;
  return f
}

function onceStrict (fn) {
  var f = function () {
    if (f.called)
      throw new Error(f.onceError)
    f.called = true;
    return f.value = fn.apply(this, arguments)
  };
  var name = fn.name || 'Function wrapped with `once`';
  f.onceError = name + " shouldn't be called more than once";
  f.called = false;
  return f
}
once_1.strict = strict;

exports.__moduleExports = once_1;
exports.default = once_1;
exports.strict = strict;
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