redefine.js
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redefine.js
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	var global = require('../internals/global');
	var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
	var has = require('../internals/has');
	var setGlobal = require('../internals/set-global');
	var inspectSource = require('../internals/inspect-source');
	var InternalStateModule = require('../internals/internal-state');

	var getInternalState = InternalStateModule.get;
	var enforceInternalState = InternalStateModule.enforce;
	var TEMPLATE = String(String).split('String');

	(module.exports = function (O, key, value, options) {
	var unsafe = options ? !!options.unsafe : false;
	var simple = options ? !!options.enumerable : false;
	var noTargetGet = options ? !!options.noTargetGet : false;
	var state;
	if (typeof value == 'function') {
	if (typeof key == 'string' && !has(value, 'name')) {
	createNonEnumerableProperty(value, 'name', key);
	}
	state = enforceInternalState(value);
	if (!state.source) {
	state.source = TEMPLATE.join(typeof key == 'string' ? key : '');
	}
	}
	if (O === global) {
	if (simple) O[key] = value;
	else setGlobal(key, value);
	return;
	} else if (!unsafe) {
	delete O[key];
	} else if (!noTargetGet && O[key]) {
	simple = true;
	}
	if (simple) O[key] = value;
	else createNonEnumerableProperty(O, key, value);
	// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
	})(Function.prototype, 'toString', function toString() {
	return typeof this == 'function' && getInternalState(this).source \|\| inspectSource(this);
	});