Awesome
known
Allow only access to known object properties using ES2015
Proxy
Install
$ npm install known
Usage
import known from 'known';
const object = {foo: true};
console.log(object.bar);
//=> undefined
const object2 = known(object);
// Throws a TypeError when you try to access an unknown property
console.log(object2.bar);
//=> [TypeError] Unknown property: bar
Note that known
transparently wraps the given object, meaning prototype properties will also exist. So known(someObject).__proto__
does not throw. If you want non-own properties to throw, ensure your object is created with Object.create(null)
.
Related
- on-change - Watch an object or array for changes (Uses
Proxy
too) - negative-array - Negative array index support (Uses
Proxy
too)