Private properties Packages

Assume all properties/methods that begin with an underscore are private and generate errors for unused or undeclared properties.

Better state management for JavaScript objects

Provides a method of converting underscored pseudo-private class members into truly private class members

Use ES2015 Proxy to restrict access of private properties.

Gives access to native objects internal properties, such as proxy's [[Target]] and [[Handler]]

A Babel plugin that transforms #property to _property or a minified name

TypeScript transformer to rename private properties and methods to allow mangling