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

foo === undefined;

Out

foo === void 0;

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

.babelrc

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

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

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