README.md



babel-plugin-undefined-to-void

Some JavaScript implementations allow undefined to be overwritten, this
may lead to peculiar bugs that are extremely hard to track down.

This plugin transforms undefined into void 0 which returns undefined
regardless of if it's been reassigned.


Example

In

foo === undefined;


Out

foo === void 0;


Installation

$ npm install babel-plugin-undefined-to-void


Usage


Via .babelrc (Recommended)

.babelrc

{
  "plugins": ["undefined-to-void"]
}


Via CLI

$ babel --plugins undefined-to-void script.js


Via Node API

require("babel-core").transform("code", {
  plugins: ["undefined-to-void"]
});