Should be
var WeakMap;
(function() {
'use strict';
var SlowWeakMap = WeakMap;
function FastWeakMap() {
var token = Object.freeze(Object.create(null));
return Object.freeze({
get: function(key) {
var shadow = key.[[Shadow]];
return shadow ? shadow.get(token) : void 0;
},
set: function(key, value) {
var shadow = key.[[Shadow]]
if (!shadow) {
shadow = new SlowWeakMap();
key.[[Shadow]] = shadow;
}
shadow.set(token, value);
},
clear: function() {
token = Object.freeze(Object.create({}));
}
});
}
// Don't do this until it is a complete shim
// WeakMap = FastWeakMap;
}());
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