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Wrap frozen keys fix in try-catch not to break other WeakMap polyfills implementations #252

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Wrap frozen keys fix in try-catch not to break other WeakMap polyfills implementations #252

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36 changes: 19 additions & 17 deletions modules/es6.weak-map.js
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Original file line number Diff line number Diff line change
Expand Up @@ -36,21 +36,23 @@ var methods = {
var $WeakMap = module.exports = require('./_collection')('WeakMap', wrapper, methods, weak, true, true);

// IE11 WeakMap frozen keys fix
if(new $WeakMap().set((Object.freeze || Object)(tmp), 7).get(tmp) != 7){
InternalMap = weak.getConstructor(wrapper);
assign(InternalMap.prototype, methods);
meta.NEED = true;
each(['delete', 'has', 'get', 'set'], function(key){
var proto = $WeakMap.prototype
, method = proto[key];
redefine(proto, key, function(a, b){
// store frozen objects on internal weakmap shim
if(isObject(a) && !isExtensible(a)){
if(!this._f)this._f = new InternalMap;
var result = this._f[key](a, b);
return key == 'set' ? this : result;
// store all the rest on native weakmap
} return method.call(this, a, b);
try {
if(new $WeakMap().set((Object.freeze || Object)(tmp), 7).get(tmp) != 7){
InternalMap = weak.getConstructor(wrapper);
assign(InternalMap.prototype, methods);
meta.NEED = true;
each(['delete', 'has', 'get', 'set'], function(key){
var proto = $WeakMap.prototype
, method = proto[key];
redefine(proto, key, function(a, b){
// store frozen objects on internal weakmap shim
if(isObject(a) && !isExtensible(a)){
if(!this._f)this._f = new InternalMap;
var result = this._f[key](a, b);
return key == 'set' ? this : result;
// store all the rest on native weakmap
} return method.call(this, a, b);
});
});
});
}
}
} catch (e) {}