babel-plugin-transform-undefined-to-void
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-transform-undefined-to-void
Usage
Via .babelrc (Recommended)
.babelrc
{
"plugins": ["transform-undefined-to-void"]
}
Via CLI
babel --plugins transform-undefined-to-void script.js
Via Node API
require("babel-core").transform("code", {
plugins: ["transform-undefined-to-void"]
});