Rick Waldron wrote:
* `Object.preventUndeclaredGet()` - change an object's behavior to
throw an error if you try to read from a property that doesn't
exist (instead of returning `undefine`).
This can be achieved with Proxy right, or is that too cumbersome?
js> var NoSuchProperty = Proxy({}, {
has: function(target, name) { return true; },
get: function(target, name, receiver) {
if (name in Object.prototype) {
return Object.prototype[name];
}
throw new TypeError(name + " is not a defined property");
}
});
js> var obj = Object.create(NoSuchProperty)
js> obj.foo = 42
42
js> obj.foo
42
js> obj.bar
/tmp/p.js:7:4 TypeError: bar is not a defined property
/be
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