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(function () {
"use strict";
// modified from https://github.com/kriskowal/es5-shim
var has = Object.prototype.hasOwnProperty,
toString = Object.prototype.toString,
forEach = require('./foreach'),
isArgs = require('./isArguments'),
hasDontEnumBug = !({'toString': null}).propertyIsEnumerable('toString'),
hasProtoEnumBug = (function () {}).propertyIsEnumerable('prototype'),
dontEnums = [
"toString",
"toLocaleString",
"valueOf",
"hasOwnProperty",
"isPrototypeOf",
"propertyIsEnumerable",
"constructor"
],
keysShim;
keysShim = function keys(object) {
var isObject = object !== null && typeof object === 'object',
isFunction = toString.call(object) === '[object Function]',
isArguments = isArgs(object),
theKeys = [];
if (!isObject && !isFunction && !isArguments) {
throw new TypeError("Object.keys called on a non-object");
}
if (isArguments) {
forEach(object, function (value) {
theKeys.push(value);
});
} else {
var name,
skipProto = hasProtoEnumBug && isFunction;
for (name in object) {
if (!(skipProto && name === 'prototype') && has.call(object, name)) {
theKeys.push(name);
}
}
}
if (hasDontEnumBug) {
var ctor = object.constructor,
skipConstructor = ctor && ctor.prototype === object;
forEach(dontEnums, function (dontEnum) {
if (!(skipConstructor && dontEnum === 'constructor') && has.call(object, dontEnum)) {
theKeys.push(dontEnum);
}
});
}
return theKeys;
};
module.exports = keysShim;
}());
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