1 var global = require('../internals/global');
2 var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
3 var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
4 var redefine = require('../internals/redefine');
5 var setGlobal = require('../internals/set-global');
6 var copyConstructorProperties = require('../internals/copy-constructor-properties');
7 var isForced = require('../internals/is-forced');
10 options.target - name of the target object
11 options.global - target is the global object
12 options.stat - export as static methods of target
13 options.proto - export as prototype methods of target
14 options.real - real prototype method for the `pure` version
15 options.forced - export even if the native feature is available
16 options.bind - bind methods to the target, required for the `pure` version
17 options.wrap - wrap constructors to preventing global pollution, required for the `pure` version
18 options.unsafe - use the simple assignment of property instead of delete + defineProperty
19 options.sham - add a flag to not completely full polyfills
20 options.enumerable - export as enumerable property
21 options.noTargetGet - prevent calling a getter on target
22 options.name - the .name of the function if it does not match the key
24 module.exports = function (options, source) {
25 var TARGET = options.target;
26 var GLOBAL = options.global;
27 var STATIC = options.stat;
28 var FORCED, target, key, targetProperty, sourceProperty, descriptor;
32 target = global[TARGET] || setGlobal(TARGET, {});
34 target = (global[TARGET] || {}).prototype;
36 if (target) for (key in source) {
37 sourceProperty = source[key];
38 if (options.noTargetGet) {
39 descriptor = getOwnPropertyDescriptor(target, key);
40 targetProperty = descriptor && descriptor.value;
41 } else targetProperty = target[key];
42 FORCED = isForced(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);
43 // contained in target
44 if (!FORCED && targetProperty !== undefined) {
45 if (typeof sourceProperty == typeof targetProperty) continue;
46 copyConstructorProperties(sourceProperty, targetProperty);
48 // add a flag to not completely full polyfills
49 if (options.sham || (targetProperty && targetProperty.sham)) {
50 createNonEnumerableProperty(sourceProperty, 'sham', true);
53 redefine(target, key, sourceProperty, options);